CN112052591B - Interlayer fine depiction and embedded modeling method under reservoir configuration constraint - Google Patents
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Abstract
The invention discloses a method for finely describing a interlayer under the constraint of a reservoir configuration, which comprises the following steps: (1) Identifying different levels of reservoir configuration interfaces by using the core phase and the logging phase; (2) Predicting different levels of reservoir configuration interfaces by using geologic deposition modes, horizontal well drilling, oil-water well production dynamics and test data; (3) classification and combination of different level reservoir configuration interfaces; (4) Different levels of reservoir configuration interface space distribution characteristic quantitative characterization; wherein the different level reservoir configuration interfaces comprise corresponding level 4 and level 5 reservoir configuration interfaces under different sedimentary microphases. Meanwhile, according to the data determined by the interlayer fine characterization method, the invention also discloses an interlayer embedded modeling method under the constraint of the reservoir configuration, so that the complete retention of interlayer information after coarsening of the reservoir model can be realized, and the method has important guiding significance for the numerical simulation research of residual oil distribution characteristics of a later-stage reservoir.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a method for finely describing and embedding a interlayer under the constraint of a reservoir configuration.
Background
The interlayer plays an important role in oil gas seepage in the oil field development process, controls the seepage of fluid in a reservoir and the distribution rule of residual oil, and is currently becoming the key point of geological fine research; the three-dimensional reservoir geological modeling is used as a mature three-dimensional visual reservoir characterization technology at present, can three-dimensionally display the development rule of a middle interlayer model in a reservoir, and has important guiding significance for guiding the problems of well group effect analysis, horizontal well while-drilling geosteering adjustment, local residual oil distribution research, low reservoir production degree, late reservoir numerical simulation precision and the like in water injection fine development.
The middle layer in the reservoir generally develops stably, the thickness change is relatively small, but the development condition of the interlayer is not uniform, the thickness change is also large, and the existence of the interlayer in the reservoir makes the seepage rule of the geological model and the fluid more complex. At present, the reservoir geological modeling can finely describe the interlayer characteristics in a reservoir, but a certain difference exists between the grid system scale of numerical simulation and modeling, so that the fine geological model must be coarsened in numerical modeling, the coarsening can cause loss of interlayer information in the model or incomplete information, fine characterization of interlayer information in the reservoir cannot be effectively performed, information loss or partial loss of a sedimentary facies and attribute parameter model (porosity, permeability and saturation model) at the development position of the interlayer can be caused, a later numerical simulation result can be greatly influenced, and seepage rules of fluid in the reservoir and residual oil distribution characteristics of the reservoir in the middle and later stages of development cannot be correctly reflected.
How to perform fine characterization of the middle-interval layer in the reservoir and fully reserve middle-interval layer information in the coarsened geologic model are core contents of current scholars research, and the current modeling method for the middle-interval layer of the reservoir is more, for example, the middle-interval layer model is built by taking high-resolution sequence stratigraphy as a guide, or the reservoir configuration characteristic research is performed in combination with the seismic data, the communication relation research of the configuration elements of the well region of the dense well network is performed, the internal configuration characteristic of the reservoir is quantitatively represented, or the configuration mode of the river phase is built in combination with the reservoir configuration research thought, the internal middle-interval layer of the reservoir is represented, the method can represent the middle-interval layer of the reservoir, but the limitation of different data causes the knowledge of the middle-interval layer to have multiple resolvability, and meanwhile, the coarsening of the model also causes the deletion of the middle-interval layer information, so that a geological modeling method for the middle-interval layer fine characterization of the reservoir is needed to be explored and the reservoir configuration characteristic information can be completely reserved, and the geological modeling problem that the numerical simulation of the reservoir at later period cannot accurately describe the residual oil distribution characteristic is solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for finely describing a middle interlayer under the constraint of a reservoir configuration, which can effectively solve the problems of middle interlayer information loss or incompleteness, inaccurate numerical simulation result and the like in the coarsening process of a traditional model; meanwhile, the invention also provides a method for modeling the interlayer embedded under the constraint of the reservoir configuration according to the data determined by the interlayer fine characterization method.
A method for finely describing a compartment layer under the constraint of a reservoir configuration comprises the following steps:
(1) Identifying different levels of reservoir configuration interfaces by using the core phase and the logging phase;
(2) Predicting different levels of reservoir configuration interfaces by using geologic deposition modes, horizontal well drilling, oil-water well production dynamics and test data;
(3) Classification and combination of different levels of reservoir configuration interfaces;
(4) Different levels of reservoir configuration interface space distribution characteristic quantitative characterization;
the different-level reservoir configuration interfaces comprise 4-level reservoir configuration interfaces and 5-level reservoir configuration interfaces corresponding to different sediment microphases, the argillaceous configuration elements corresponding to the 4-level reservoir configuration interfaces and the 5-level reservoir configuration interfaces are respectively interlayers and interlayers, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers.
Preferably, the identification of the different-level reservoir configuration interfaces by using the core phase and the logging phase in the step (1) is specifically as follows: and (3) carrying out identification and explanation of different levels of reservoir configuration interfaces in the vertical direction of the single well by using core phase data, wherein the identification and explanation comprises a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, an explanation mode of the single well vertical well logging configuration interface is established by establishing a corresponding relation between the core phase and the well logging phase, and the identification and the explanation of different levels of reservoir configuration interfaces are carried out on the un-cored well by using the explanation mode.
Preferably, in the predicting of the reservoir configuration interface in the step (2), the prediction of the plane reservoir configuration interface is performed by using microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data under different deposition environments of the block, so as to determine the development positions of different levels of reservoir configuration interfaces in the lateral direction and the correlations between the different levels of reservoir configuration interfaces and adjacent wells.
Preferably, the classification of the different level reservoir configuration interfaces in step (3) is specifically: dividing different levels of reservoir configuration interfaces according to the vertical identification and lateral configuration interface prediction results of the different levels of reservoir configuration interfaces, wherein the dividing types comprise a pinch-out type, a continuous type and a lateral cut-and-stack type;
the combination of different levels of reservoir configuration interfaces is specifically: and combining development characteristics of configuration elements corresponding to different levels of reservoir configuration interfaces, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as a guide to finish the characterization of the lateral relationship of the reservoir configuration interfaces of different levels.
Preferably, the pinch-out type reservoir stratum structure interface of the same grade is discontinuously developed on two adjacent single wells, the corresponding structure elements are characterized by isolated development, and the thickness of the structure elements on two sides is thinned and pinch-out;
the continuous type is that the reservoir configuration interface of the same grade continuously develops on two adjacent single wells, the corresponding configuration elements are characterized by continuous development, and the thickness of the configuration elements on two sides is basically kept stable;
the lateral stacking means that the reservoir configuration interfaces of the same grade develop on two adjacent single wells, the thickness of the reservoir configuration element corresponding to one well is increased, and the configuration element interfaces have relevance.
Preferably, the quantitative characterization of spatial spread characteristics of the different-level reservoir configuration interfaces in the step (4) includes vertical development characteristics and corresponding depth and thickness data, and lateral development characteristics and corresponding depth and thickness data of the different-level reservoir configuration interfaces.
A method for modeling a compartment layer embedded under the constraint of a reservoir configuration comprises the following steps:
reservoir barrier and formation of a barrier model
(11) Establishing a reservoir interlayer model:
(111) Establishing a trend surface model of the top and the bottom of the interlayer on the basis of the interlayer corresponding depth and thickness data obtained in the step (4);
(112) Establishing a structural model of the interlayer by using the trend surface models of the top and the bottom of the interlayer in the step (111);
(113) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) Building a reservoir interlayer model:
(121) Establishing a trend surface model of the top and the bottom of the interlayer on the basis of the data of the corresponding depth and the thickness of the interlayer obtained in the step (4);
(122) Performing boundary delineation and independent assignment on the trend surface model obtained in the step (121) aiming at the distribution range on the interlayer plane;
(123) Establishing a structural model of the interlayer by using the boundary range, the top and bottom trend surface models of the interlayer obtained in the step (122);
(124) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
nesting of reservoir and Sandwich models
Embedding the interlayer model established in the step (one) into a reservoir model to form a set of complete reservoir three-dimensional fine geological model containing interlayer information under the constraint of reservoir configuration.
The invention has the advantages that:
according to the method for finely describing the interlayer under the constraint of the reservoir configuration, fine characterization is carried out on the interlayer, obtained data is used for embedded modeling of the interlayer under the constraint of the reservoir configuration, complete retention of interlayer information after coarsening of a reservoir model can be achieved, meanwhile, the method is not influenced by coarsening parameters of the reservoir model, the defect that information of the conventional model coarsening interlayer is missing or incomplete is overcome, and the method has important guiding significance for research on residual oil distribution characteristics in numerical simulation of a later-stage reservoir.
Drawings
FIG. 1 is a flow chart of a method for modeling a compartment insert under a reservoir configuration constraint provided by the present invention;
FIG. 2 is a diagram of different levels of reservoir configuration interface identification provided by the present invention;
FIG. 3 is a lateral development characteristic of a target layer 5-grade argillaceous interlayer (front delta mud) provided by the invention;
FIG. 4 is an enlarged partial view of portion 3a of FIG. 3;
FIG. 5 is an enlarged partial view of portion 3b of FIG. 3;
FIG. 6 provides a lateral development characteristic of a target layer, grade 5 argillaceous interlayer and grade 4 calcareous interlayer according to the invention;
FIG. 7 is a schematic illustration of a pinch-out configuration interface provided by the present invention;
FIG. 8 is a schematic illustration of a continuous configuration interface provided by the present invention;
FIG. 9 is a schematic illustration of a side cut-and-stack configuration interface provided by the present invention;
FIG. 10 shows a argillaceous interlayer phase model corresponding to a 5-level configuration interface provided by the invention;
FIG. 11 shows a calcareous interlayer phase model corresponding to a 4-level configuration interface provided by the invention.
Detailed Description
Example 1
A method for finely describing a compartment layer under the constraint of a reservoir configuration comprises the following steps:
(1) And identifying different levels of reservoir configuration interfaces by using the core phase and the logging phase: the method comprises the steps of carrying out identification and explanation of different levels of reservoir configuration interfaces in a single well vertical direction by using core phase data, wherein the identification and explanation comprises an argillaceous interlayer, a calcareous interlayer, an argillaceous interlayer and a calcareous interlayer, establishing an explanation mode of the single well vertical well logging configuration interface by establishing a corresponding relation between a core phase and a well logging phase, and carrying out identification and explanation of different levels of reservoir configuration interfaces in an un-cored well by using the explanation mode; wherein, the logging response characteristic of the muddy interlayer is: the natural potential SP and the natural gamma GR curve obviously return to the mudstone base line, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and no amplitude difference exists basically;
the logging response characteristic of the calcareous interlayer is as follows: the natural potential SP and the natural gamma GR curves have no obvious abnormality, the microelectrode is in a high peak sawtooth shape, basically has no amplitude difference, the acoustic wave time difference AC is in a low value peak, and the resistivity is higher than that of the Rt curve;
the logging response characteristic of the argillaceous interlayer is as follows: the natural potential SP or the natural gamma GR obviously returns to the mudstone baseline, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and no amplitude difference exists basically;
the logging response characteristic of the calcareous interlayer is as follows: the natural potential SP and the natural gamma GR curve have no obvious abnormality, the microelectrode presents a high peak zigzag shape, the acoustic wave time difference AC presents a low value peak, and the resistivity Rt curve value is higher than that of sandstone.
(2) Predicting a reservoir configuration interface by using geologic deposition mode, horizontal well drilling, oil-water well production dynamics and test data: predicting a planar reservoir configuration interface by utilizing microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data under different deposition environments of the blocks, and determining the development positions of different levels of reservoir configuration interfaces in the lateral direction and the interrelationship between the different levels of reservoir configuration interfaces and adjacent wells;
(3) Classification and combination of different level reservoir configuration interfaces:
(31) The classification of different levels of reservoir configuration interfaces is specifically: dividing different levels of reservoir configuration interfaces according to the vertical identification and lateral configuration interface prediction results of the different levels of reservoir configuration interfaces, wherein the dividing types comprise a pinch-out type, a continuous type and a lateral cut-and-stack type;
the pinch-out type reservoir stratum structure interface of the same grade is discontinuously developed on two adjacent single wells, and the corresponding structure elements are characterized by isolated development, thinned towards the thickness of the structure elements on two sides and pinch out;
the continuous type is that the reservoir configuration interface of the same grade continuously develops on two adjacent single wells, the corresponding configuration elements are characterized by continuous development, and the thickness of the configuration elements on two sides is basically kept stable;
the lateral stacking means that the reservoir configuration interfaces of the same grade develop on two adjacent single wells, the thickness of the reservoir configuration element corresponding to one well is increased, and the configuration element interfaces have relevance;
(32) The combination of different levels of reservoir configuration interfaces is specifically: combining development characteristics of configuration elements corresponding to different levels of reservoir configuration interfaces, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as a guide to finish the characterization of the lateral relationship of the reservoir configuration interfaces of different levels;
(4) And (3) quantitatively characterizing the spatial spread characteristics of different-level reservoir configuration interfaces: the method comprises the steps of vertical development characteristics and corresponding depth and thickness data of different levels of reservoir configuration interfaces, and lateral development characteristics and corresponding depth and thickness data;
the different-level reservoir configuration interfaces comprise corresponding 4-level reservoir configuration interfaces and 5-level reservoir configuration interfaces under different deposition microphases, the argillaceous configuration elements corresponding to the 4-level reservoir configuration interfaces and the 5-level reservoir configuration interfaces are respectively interlayers and interlayers, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers.
Example 2
The method for modeling the interlayer embedded under the constraint of the reservoir configuration has a flow diagram shown in fig. 1, and comprises the following steps:
building a reservoir interlayer and an interlayer model:
(11) Establishing a reservoir interlayer model:
(111) Establishing a trend surface model of the top and bottom of the interlayer based on the interlayer corresponding depth and thickness data obtained in the step (4) in the embodiment 1;
(112) Directly using trend surface models of the top and the bottom of the interlayer in the step (111) to build a structural model of the interlayer in structural modeling;
(113) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) Building a reservoir interlayer model:
(121) Establishing a trend surface model of the top and bottom of the interlayer based on the data of the corresponding depth and thickness of the interlayer obtained in the step (4) in the above embodiment 1;
(122) Boundary delineation and independent assignment are carried out on the trend surface obtained in the step (121) aiming at the distribution range on the interlayer plane;
(123) Establishing a structural model of the interlayer by using the boundary range, the top and bottom trend surface models of the interlayer obtained in the step (122) in structural modeling;
(124) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
(II) nesting of reservoir and Sandwich models:
embedding the interlayer model established in the step (2) into a reservoir model to form a set of complete reservoir three-dimensional fine geological model containing interlayer information under the constraint of reservoir configuration.
Example 3
In this embodiment, the invention is specifically analyzed and described by taking the S block of the extended oilfield Fu county region in the south of the erdos basin as an example. The research area is positioned at the south of the Erdos basin, the internal structure of the block is simple, and the block is monoclinic in one western style and develops without faults; the main target layer of the research area is an extended group length 8-oil layer group, the main deposition background is delta front edge and front delta two types of subphase deposition, and three types of microphases of underwater diversion river channels, underwater diversion river channels and front delta mud are mainly developed; principal force small layer length 8 2 The small-layer rock is mainly fine sandstone, and secondly fine sandstone, the particles are in a prismatic-subsround shape, the debris is seriously weathered, the sorting and rounding are medium, the point-line contact is carried out, and the average porosity is 9.76%; an average effective permeability of 0.35X 10 -3 μm 2 The average sand thickness is 24m, the shape of the logging curve is mainly a box shape, the thickness of the sand body is stable, the connection is good, the inside of the target layer is developed with a argillaceous and calcareous interlayer, wherein the argillaceous interlayer is mainly developed, the interlayer is stably developed, and the interlayer is mainly developedA mud-raising and calcareous interlayer, and the interlayer is unstable in development.
A method for finely describing a compartment layer under the constraint of a reservoir configuration comprises the following steps:
(1) And identifying a reservoir configuration interface by using the core phase and the logging phase: the method comprises the steps of carrying out identification and explanation of different levels of reservoir configuration interfaces in a single well vertical direction by using core phase data, wherein the identification and explanation comprises a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, establishing an explanation mode of the single well vertical well logging configuration interface by establishing a corresponding relation between a core phase and a well logging phase, and carrying out identification and explanation of different levels of reservoir configuration interfaces in an un-cored well by using the explanation mode; the logging response characteristic of the argillaceous interlayer is as follows: the natural potential SP and the natural gamma GR curve obviously return to the mudstone base line, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and no amplitude difference exists basically; the logging response characteristic of the calcareous interlayer is as follows: the natural potential SP and the natural gamma GR curves have no obvious abnormality, the microelectrode is in a high peak sawtooth shape, basically has no amplitude difference, the acoustic wave time difference AC is in a low value peak, and the resistivity is higher than that of the Rt curve; the logging response characteristic of the argillaceous interlayer is as follows: the natural potential SP or the natural gamma GR obviously returns to the mudstone baseline, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and no amplitude difference exists basically; the logging response characteristic of the calcareous interlayer is as follows: the natural potential SP and the natural gamma GR curve have no obvious abnormality, the microelectrode presents a high peak zigzag shape, the acoustic wave time difference AC presents a low value peak, and the resistivity Rt curve value is higher than that of sandstone. As shown in fig. 2, 4 sets of muddy interlayers corresponding to the 5-level configuration interface stably deposited are vertically and automatically developed on the layer of the L110 exploratory well, wherein the bottom-most gray and gray-black plum family shale interlayer is developed, the thickness of the interlayer is about 8-15m, and the interlayer is the most stable set of interlayers in a research area; 2 sets of argillaceous interlayer are developed in the target layer, wherein the lower set is light gray argillaceous and silty argillite, the thickness is about 6-8m, and the interlayer is relatively stable in a research area; the lake plane in the deposition period rises in a larger scale to form a set of black and deep black mudstone deposition with stable development, and the thickness is about 6-8 m; the top cover is light gray, gray mudstone and silty mudstone with the thickness of about 3-5 m. Meanwhile, 9 sets of calcareous and argillaceous interlayers (8 sets of calcareous interlayers and 1 set of argillaceous interlayers) are also developed in the target layer of the L110 exploratory well, the thickness of the interlayer is between 0.2 and 0.8m, and the average thickness is about 0.4m, and the interlayer is generally light gray, gray argillaceous siltstone argillaceous or calcareous interlayer; and performing recognition and explanation of different levels of reservoir configuration interfaces in the vertical direction of other non-cored wells in the research area by using the established logging interpretation mode, so as to complete recognition of different levels of reservoir configuration interfaces in the vertical direction of the single well in the work area.
(2) Predicting a reservoir configuration interface by using geologic deposition mode, horizontal well drilling, oil-water well production dynamics and test data: and predicting a planar reservoir configuration interface by utilizing microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data under different deposition environments of the blocks, and determining the development positions of different levels of reservoir configuration interfaces in the lateral direction and the correlation between the different levels of reservoir configuration interfaces and adjacent wells. According to the identification and interpretation modes of different levels of reservoir stratum configuration interfaces in the vertical direction of the non-cored well target layer established in the last step, further combining a microphase deposition mode to conduct lateral prediction of a argillaceous interlayer and a calcareous interlayer corresponding to the 5-level configuration interface, and predicting the configuration interface of the interlayer, as shown in fig. 3, the front delta argillaceous interlayer explained in the figure is determined together according to the interpretation mode of a single well vertical well logging configuration interface and microphase deposition characteristics (a deposition microphase plane layout diagram and a regional deposition mode of the set of argillaceous interlayers), the development scale of the argillaceous interlayer in the research is determined, the lateral development characteristics of the corresponding configuration interface are determined, the lateral development position, the depth and other data of the argillaceous interlayer are determined, the front delta argillaceous interlayer in the L147-1-L143-2 well connecting section in the figure is stable in development, the thickness of the 5 single well argillaceous interlayers is between 6 m and 8m, and the lateral continuity is good. For the configuration interface prediction of the interlayer, as shown in fig. 6, firstly, a former delta argillaceous interlayer is established as a specific target sediment in the same period, and lateral prediction of different interlayer configuration interfaces is performed in a microphase deposition mode and an established logging interpretation mode, for example, the lateral development of a VI, VII, VIII-number calcareous interlayer at the upper part between an L110-1 well and an L110-4 well, the lateral extinction of a I, II, III, IV, V-number calcareous interlayer at the lower part, the interlayer development is complex, and the continuity is poor; the interlayer has good lateral continuity and poor lateral continuity.
(3) Classification and combination of different level reservoir configuration interfaces: (31) classification of different levels of reservoir configuration interfaces specifically: dividing different levels of reservoir configuration interfaces according to the vertical identification and lateral configuration interface prediction results of the different levels of reservoir configuration interfaces, wherein the dividing types comprise a pinch-out type (figure 7), a continuous type (figure 8) and a lateral cut-and-stack type (figure 9);
the pinch-out type reservoir stratum structure interface of the same grade is discontinuously developed on two adjacent single wells, and the corresponding structure elements are characterized by isolated development, thinned towards the thickness of the structure elements on two sides and pinch out; specifically, as shown in FIG. 6, between L110 and L110-1 wells、/>The development characteristics of the calcareous interlayer show that the configuration interface is a fight type, the interlayer corresponding to the type of configuration interface is unstable in development in the lateral direction, and meanwhile, the interlayer is +.>、/>The interface of the calcium interlayer configuration is also a kill type; similarly, the interface between the I, II, III, IV, V calcareous interlayer configurations of the L110-1 and L110-4 wells is a fight type interface;
the continuous type is that the reservoir configuration interface of the same grade continuously develops on two adjacent single wells, the corresponding configuration elements are characterized by continuous development, and the thickness of the configuration elements on two sides is basically kept stable; specifically, as shown in the development characteristics of the front delta argillaceous interlayer shown in fig. 3, the configuration interface is continuous; in FIG. 6, the muddy interlayer is continuous; between L110 and L110-1 well、/>、/>、/>And the interface of the VII and VIII calcareous interlayer configuration between the L110-1 and L110-4 wells is continuous, and the interlayer and interlayer corresponding to the interface of the configuration are relatively stable in development in the lateral direction;
the lateral stacking means that the reservoir configuration interfaces of the same grade develop on two adjacent single wells, the thickness of the reservoir configuration element corresponding to one well is increased, and the configuration element interfaces have relevance; specifically, as shown in the development characteristics of the VI calcareous interlayer between the L110-1 and L110-4 wells in FIG. 6, the configuration interface is laterally overlapped, and the development thickness of the interlayer corresponding to the configuration interface is inconsistent in the lateral direction;
(32) The combination of different levels of reservoir configuration interfaces is specifically: combining development characteristics of configuration elements corresponding to different levels of reservoir configuration interfaces, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as a guide to finish the characterization of the lateral relationship of the reservoir configuration interfaces of different levels; the front delta argillaceous interlayer shown in fig. 3 is stable in development in a work area, and adjacent interlayer configuration interfaces are combined according to morphological characteristics of the interlayer configuration elements, namely, the argillaceous configuration elements in the L147-1-L143-2 continuous development in the lateral direction in the well connecting section are all lateral combinations of the 5-level configuration interface and the 5-level configuration interface; as shown in FIG. 6, between L110 and L110-1 wells、/>、/>、/>All belong to the fight type configuration interface->、/>、/>、/>All belong to the lateral combination of the 4-level configuration interface and the 4-level configuration interface; l110-1 and L110-4 interwell VI, VII, VIII belong to the lateral combination of the level 4 configuration interface and the level 4 configuration interface; (4) And (3) quantitatively characterizing the spatial spread characteristics of different-level reservoir configuration interfaces: the method comprises the steps of vertical development characteristics and corresponding depth and thickness data of different levels of reservoir configuration interfaces, and lateral development characteristics and corresponding depth and thickness degrees; for the muddy interlayer in FIG. 6, according to the lateral development characteristics of the front delta muddy interlayer in (31) and (32), determining the development position and depth thickness data of the front delta muddy interlayer in the lateral direction, wherein the development top vertical depth of the front delta muddy interlayer in the L110 well is 1300.45m, the thickness is 5.70m, the development top vertical depth of the front delta muddy interlayer in the L110-1 well is 1299.40.00m, the thickness is 6.10m, the development top vertical depth of the front delta muddy interlayer in the L110-4 well is 1304.20m, the thickness is 5.40m, the 5-level configuration interface between the three openings Shan Jingjing is continuous, the combination type is the lateral combination of the 5-level configuration interface and the 5-level configuration interface, and the parameters are arranged to form a 5-level configuration interface data system; for the calcareous interlayer in FIG. 6, the development position and depth thickness data in the lateral direction of the calcareous interlayer are determined according to the lateral development characteristics of the calcareous interlayer which are determined in (31) and (32), and the L110 wellThe vertical depth of the growth top of the calcium interlayer is 1312.13m, the thickness is 0.32m, and the L110-1 well is +.>The vertical depth of the growth top of the calcium interlayer is 1310.15m, the thickness is 0.25m, and the L110-4 well is +.>No. calcareous interlayer development top vertical depth 1316.45m, thickness 0.55m, L110 well (calcareous interlayer) and L110-1 well interwell development +.>The No. calcareous sandwich configuration interface belongs to continuous type, the combination type is the lateral combination of a 4-level configuration interface and a 4-level configuration interface, the VI-type calcareous sandwich configuration interface developed between the L110-1 well and the L110-4 well belongs to lateral stacking type, and the combination type is the lateral combination of the 4-level configuration interface and the 4-level configuration interface.
A method for modeling a compartment layer embedded under the constraint of a reservoir configuration comprises the following steps:
building a reservoir interlayer and an interlayer model:
(11) Establishing a reservoir interlayer model:
the bottom of the target layer of the research area is developed stably to form a Zhangjia beach shale interlayer, and the upper part is developed with two sets of stable mudstone sediments (one set is front delta mud sediments formed by large area rising of a lake plane in the sedimentation process); the first set of argillaceous interlayer from bottom to top is gray, dark gray argillaceous rock, silty argillaceous rock, has a development level and corrugated layering, has a thickness of 3-5.0m, has obvious electric characteristics, and has stable development in a research area; the second set of argillaceous interlayer is characterized in that gray black and black argillaceous deposits, the thickness is between 6 and 10m, the electrical characteristics have obvious argillaceous characteristic display, the natural potential is close to a base line, the natural gamma is high, the acoustic time difference is low, the microelectrode series is low, the permeability is almost zero, and the like, and the interlayer is most stable in development in the whole research area; aiming at the establishment of the argillaceous interlayer model, the concrete process is as follows: 1) According to the determined result in the step (4), importing the vertical depth and thickness data and the lateral corresponding depth and thickness data corresponding to the 5-level argillaceous interlayer of the single-well target layer of the research area into geological modeling software to serve as basic data; 2) Utilizing a Make Surface module in a reservoir geological modeling software petrel2015 platform to compile a trend Surface model of the top and bottom of a set of argillaceous interlayer, wherein the trend Surface model trend is required to follow the construction trend of a reservoir model; 3) Repeating the step 2 to generate trend surface models of the top surfaces and the bottom surfaces of other interlayer in the target layer; 4) When modeling is constructed, trend surface data of the top and the bottom of the interlayer are directly applied, an interlayer phase model is established in a value assignment mode in the phase modeling process, the interlayer phase model and the attribute parameter model are directly assigned with '0', 1 grid is vertically arranged in grid arrangement, and the plane is positioned according to phase change points, so that an interlayer model of a research area can be established, and the interlayer model is shown in fig. 10;
(22) Building a reservoir interlayer model:
the interlayer inside the target layer of the research area is developed, the thickness change is large, the interlayer in the target layer is developed from 0.2m to 0.8m, the physical property of the target layer is deteriorated due to the existence of the interlayer in the target layer, and the non-uniformity in the longitudinal direction is enhanced; the interlayer in the target layer of the research area mainly comprises a calcareous interlayer and a argillaceous interlayer, and the calcareous interlayer and the argillaceous interlayer correspond to different logging response characteristics. For the 4-grade calcareous interlayer of the research areaAnd building a VI-number calcareous interlayer model, wherein the specific process is as follows: 1) According to the determined result in the step (4), importing the vertical depth and thickness data and the lateral corresponding depth and thickness data corresponding to the 4-level calcareous interlayer of the single-well target layer of the research area into geological modeling software to serve as basic data; 2) Utilizing a Make Surface module in a reservoir geological modeling software petrel2015 platform to compile a trend Surface model of the top and bottom of a certain set of calcareous interlayer; 3) Repeating the step 2 to generate trend surface models of the top surfaces and the bottom surfaces of other interlayers in the target layer; 4) Combined clampThe lateral development characteristics of the layers are subjected to interlayer boundary delineation and independent assignment on the obtained trend surface; 5) When the structure modeling is carried out, the boundary range of the interlayer and the top and bottom trend surface models of the interlayer are used, the layer surface and boundary control method is adopted to build the interlayer phase model, the assignment mode is adopted in the phase modeling process, the interlayer phase model and the attribute parameter model are directly assigned with '0', and 1 grid is vertically arranged in the grid arrangement, as shown in fig. 11.
(II) nesting of reservoir and Sandwich models:
embedding the interlayer model established in the step (I) into a reservoir model, so that a complete reservoir geological model comprising the reservoir model, the interlayer and the interlayer model can be formed, the reservoir model is only required to be coarsened in the later model coarsening process (under any scale), the interlayer model does not participate in the coarsening process, interlayer information in the reservoir can be completely reserved, and a complete reservoir three-dimensional fine geological model comprising interlayer information under the constraint of the reservoir configuration is formed.
Carrying out fine depiction of an interlayer in the reservoir by combining a reservoir configuration theory, further establishing a reservoir interlayer model, and finally realizing nesting of the reservoir and the interlayer model; the interlayer model in the modeling method is not influenced by coarsening of the reservoir model, so that the interlayer model can completely retain interlayer information in the reservoir, and a finer geological model data body is provided for later-stage reservoir numerical simulation.
Claims (3)
1. A method for finely describing a interlayer under the constraint of a reservoir structure is characterized by comprising the following steps: the method comprises the following steps:
(1) Identifying different levels of reservoir configuration interfaces by using the core phase and the logging phase;
(2) Predicting different levels of reservoir configuration interfaces by using geologic deposition modes, horizontal well drilling, oil-water well production dynamics and test data;
(3) Classification and combination of different levels of reservoir configuration interfaces;
(4) Different levels of reservoir configuration interface space distribution characteristic quantitative characterization;
the different-level reservoir configuration interfaces comprise 4-level reservoir configuration interfaces and 5-level reservoir configuration interfaces corresponding to different deposition microphases, the argillaceous configuration elements corresponding to the 4-level reservoir configuration interfaces and the 5-level reservoir configuration interfaces are respectively interlayers and interlayers, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers;
the identification of the reservoir configuration interfaces of different levels by using the core phase and the logging phase in the step (1) is specifically as follows: the method comprises the steps of carrying out identification and explanation of different levels of reservoir configuration interfaces in a single well vertical direction by using core phase data, wherein the identification and explanation comprises an argillaceous interlayer, a calcareous interlayer, an argillaceous interlayer and a calcareous interlayer, establishing an explanation mode of the single well vertical well logging configuration interface by establishing a corresponding relation between a core phase and a well logging phase, and carrying out identification and explanation of different levels of reservoir configuration interfaces in an un-cored well by using the explanation mode;
the prediction of the different-level reservoir configuration interfaces in the step (2) is to predict the plane reservoir configuration interfaces by utilizing microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data under different deposition environments of blocks, so as to determine the development positions of the different-level reservoir configuration interfaces in the lateral direction and the correlation between the different-level reservoir configuration interfaces and adjacent wells;
the classification of different levels of reservoir configuration interfaces in step (3) is specifically: dividing different levels of reservoir configuration interfaces according to the vertical identification and lateral configuration interface prediction results of the different levels of reservoir configuration interfaces, wherein the dividing types comprise a pinch-out type, a continuous type and a lateral cut-and-stack type;
the combination of different levels of reservoir configuration interfaces is specifically: combining development characteristics of configuration elements corresponding to different levels of reservoir configuration interfaces, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as a guide to finish the characterization of the lateral relationship of the reservoir configuration interfaces of different levels;
the pinch-out type reservoir stratum structure interface of the same level is discontinuously developed on two adjacent single wells, and the corresponding structure elements are characterized by isolated development, thinned towards the thickness of the structure elements on two sides and pinch-out;
the continuous type is that the reservoir configuration interface of the same grade continuously develops on two adjacent single wells, the corresponding configuration elements are characterized by continuous development, and the thickness of the configuration elements on two sides is basically kept stable;
the lateral stacking means that the reservoir configuration interfaces of the same grade develop on two adjacent single wells, the thickness of the reservoir configuration element corresponding to one well is increased, and the configuration element interfaces have relevance.
2. The method for fine-characterization of a compartment under reservoir configuration constraints of claim 1, wherein: and (3) quantitatively characterizing the spatial distribution characteristics of the different-level reservoir configuration interfaces, wherein the quantitative characterization comprises vertical development characteristics and corresponding depth and thickness data of the different-level reservoir configuration interfaces, and lateral development characteristics and corresponding depth and thickness data.
3. A method for modeling a compartment interlayer under the constraint of a reservoir configuration is characterized by comprising the following steps: the method comprises the following steps:
reservoir barrier and formation of a barrier model
(11) Establishing a reservoir interlayer model:
(111) Establishing trend surface models of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer;
(112) Establishing a structural model of the interlayer by using the trend surface models of the top and the bottom of the interlayer in the step (111);
(113) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) Building a reservoir interlayer model:
(121) Establishing trend surface models of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer;
(122) Performing boundary delineation and independent assignment on the trend surface model obtained in the step (121) aiming at the distribution range on the interlayer plane;
(123) Establishing a structural model of the interlayer by using the boundary range, the top and bottom trend surface models of the interlayer obtained in the step (122);
(124) In the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are assigned with 0, and 1 grid is arranged in the vertical direction of the grid system;
nesting of reservoir and Sandwich models
Embedding the sandwich model established in the step (one) into a reservoir model;
the interlayer corresponding depth and thickness data and the interlayer corresponding depth and thickness data are obtained through the step (4) in the interlayer fine-painting method under the constraint of the reservoir configuration of claim 2.
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