CN101980053B - Complicated reef flat reservoir predicting method - Google Patents
Complicated reef flat reservoir predicting method Download PDFInfo
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Abstract
The invention relates to a complicated reef flat reservoir predicting method, and belongs to the technical field of oil exploration. An seismic facies and a sedimentary facies are taken as restraints, interwell interpolation and horizontal fit extrapolation are performed under the control of a sedimentary facies modified line, a blocky initial impedance model according with the geological characteristics of a reef flat reservoir is constructed, spacial structures and physical properties of underground formations are solved through logging-restrained seismic inversion, the secondary interpretation of the reservoir is further carried out under the restraint of the seismic facies and the sedimentary facies, and the spatial distribution characteristics of the reef flat reservoir are finely described; therefore, the quantitative prediction accuracy of the reservoir is obviously improved, the calculating accuracy of the reservoir is higher, the calculating results are more reliable, and the economic benefit of exploring super-deep complicated reef flat reservoir is greatly improved.
Description
Technical field:
The invention belongs to petroleum exploration field, relate to a kind of complicated reef flat reservoir predicting.
Background technology:
At present development multiple method for predicting reservoir, as seismic facies analysis, seismic inversion, seismic attributes analysis etc.Wherein, seismic inversion is most widely used exploration engineering in reservoir description.The patent that is 200510090128.2 as application number discloses a kind of method of deposition phase control for casting sandstone oil reservoir attribute, realized the phased prediction of the physical parameter such as the thickness, factor of porosity, permeability of reservoir sandstone, initial oil saturation and oil-water relative permeability etc., it is the phased prediction for clastic reservoir rock, but, forecasting techniques for the complicated reef of deep layer beach reservoir is perfect not, the identification of reservoir and quantitative forecast precision are lower, mainly have following several problem:
(1) the current main flow seismic inversion in use is all based on horizontal layer uniform dielectric theory, be difficult to meet reef beach reservoir space complex shape, the geological condition of horizontal fast-changing block stratum body, the geologic model of setting up can't accurately reflect real geologic body Distribution Characteristics;
(2) the less exploration new district at drilling data, often adopt the mode of virtual well interpolation to control the border of reservoir.Because the spatial complex shape of reef beach reservoir is changeable, can't accurately determine position and the quantity of virtual well, adopt the mode of virtual well interpolation can't accurately and subtly portray the reservoir border, be difficult to meet the requirement of prospect pit deployment and reserves calculating;
(3) reef beach reservoir thickness is large, and reservoir internal wave resistance difference is less, adopts conventional Optimum Impedance Inversion Method quantitative forecast precision lower.
Summary of the invention:
The objective of the invention is the inverting initial model that exists for above-mentioned existing reef beach reservoir prediction technique inaccurate, unintelligible and reservoir thickness is portrayed to and the defect such as factor of porosity quantitative forecast precision is inadequate in the border of reservoir, a kind of complicated reef flat reservoir predicting that improves the reservoir prediction precision is proposed.
For achieving the above object, the present invention is by the following technical solutions:
Step of the present invention is as follows:
1. meticulous depiction sedimentary facies modified line, determine the zone of interest Distribution of Sedimentary Facies;
2. build the impedance initial value model that meets reef beach geologic characteristics, carry out phased Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling builds meticulousr phased initial model, carries out the phased wave impedance inversion of secondary and Gamma inversion, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and extremely carry out to determine the distribution range of Favorable Reservoir;
5. carry out reservoir parameter inversion, the factor of porosity of quantitative forecast reservoir and thickness, complete the fine description of reservoir.
Wherein, the modified line of meticulous depiction sedimentary facies, determine the zone of interest Distribution of Sedimentary Facies, comprises the following steps:
(1) carry out well shake Fine calibration, set up rational geologic model and carry out Seismic forward research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase, change into sedimentary facies in conjunction with drilling geology research by seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest Distribution of Sedimentary Facies feature.
Structure meets the impedance initial value model of reef beach geologic characteristics, carries out phased Application of Logging-constrained Inversion, obtains conventional Acoustic Impedance Data body, comprises the following steps:
(1) utilize structure Fine structural interpretation layer position and layer data achievement to build sequence frame model accurately;
(2) take known geologic rule as guidance, take seismic facies and sedimentary facies as constraint, the well that adheres to different sedimentary facies belts separately is carried out respectively to well curvature correction and normalized, utilize interpolation and laterally matching extrapolation between sediment phase change line traffic control well, build the phased initial model that meets reef beach geologic characteristics;
(3) utilize phased initial model to carry out Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body.
The secondary modeling builds meticulousr phased initial model, carries out the phased wave impedance inversion of secondary and Gamma inversion, obtains reflecting the Acoustic Impedance Data body of pure reservoir, comprises the following steps:
(1) carry out secondary Fine calibration and the reservoir preliminary interpretation of reservoir on conventional Acoustic Impedance Data body, determine top, the bottom boundary of reservoir, and then reservoir top, bottom boundary are added in the sequence frame model and carry out the phased modeling of secondary, build meticulousr impedance initial value model, carry out the secondary Study of The Impedence Inversion Restrained By Well Log;
(2) utilize secondaries Impedance Inversion data volume to carry out Gamma inversion as soft-constraint, setting rational gamma threshold value utilizes the gamma body to carry out filtering to secondaries Impedance Inversion data volume, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir.
Extract low wave impedance and extremely carry out to determine the distribution range of Favorable Reservoir, to carry out the Fine structural interpretation of reservoir under the constraint of seismic facies and sedimentary facies, by low wave impedance muddy limestone rejecting in equiphase zone between water channel, backreef lagoon, beach between reef, extract the distribution range that low wave impedance carrys out to determine Favorable Reservoir extremely.
Carry out reservoir parameter inversion, the factor of porosity of quantitative forecast reservoir and thickness, complete the fine description of reservoir, comprises the following steps:
(1) correlationship between the Acoustic Impedance Data body of intersection analysis reservoir porosity and the pure reservoir of reflection, carry out reservoir parameter inversion, obtains the Prediction of Reservoir Porosity result;
(2) extract the objective interval factor of porosity in definite distribution of favorable reservoir district and be greater than 2.5% low wave impedance sampling point and add up and obtain reservoir time thickness, with Reservoir Interval Velocity, multiply each other and obtain the distribution of reservoir net thickness;
(3) carry out Comprehensive Evaluation of Reservoir on above-mentioned Prediction of Reservoir Porosity and thickness prediction achievement basis, complete the fine description of reservoir.
The present invention is that to take seismic facies and sedimentary facies be constraint, carry out interpolation and laterally matching extrapolation between well under the control of sedimentary facies modified line, structure meets the block impedance initial value model of reef beach geologic characteristics, by well log constrained seismic inversion, underground rock stratum space structure and physical property are solved, and then carry out the second interpretation of reservoir under the constraint of seismic facies and sedimentary facies, the spatial feature of fine description reef beach reservoir, reservoir quantitative forecast precision is obviously improved, the reserves computational accuracy is higher, result of calculation is more reliable, significantly improved the exploration economic benefit of the complicated reef of super deep layer beach reservoir.
The accompanying drawing explanation:
Fig. 1 is FB(flow block) of the present invention;
Fig. 2 is the present invention and prior art initial model effect contrast figure;
Fig. 3 is the present invention and prior art inverting Profile Correlation figure.
Embodiment:
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1, the present invention includes following steps:
1. meticulous depiction sedimentary facies modified line, determine the zone of interest Distribution of Sedimentary Facies;
2. build the impedance initial value model that meets reef beach geologic characteristics, carry out phased Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling builds meticulousr phased initial model, carries out the phased wave impedance inversion of secondary and Gamma inversion, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and extremely carry out to determine the distribution range of Favorable Reservoir;
5. carry out reservoir parameter inversion, the factor of porosity of quantitative forecast reservoir and thickness, complete the fine description of reservoir.
Wherein, 1. described meticulous depiction sedimentary facies modified line of step, determine the zone of interest Distribution of Sedimentary Facies, draws a circle to approve favourable facies tract and distribute, and comprising:
(1) carry out well shake Fine calibration, set up rational geologic model and carry out Seismic forward research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase, change into sedimentary facies in conjunction with drilling geology research by seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest Distribution of Sedimentary Facies feature;
Step 2. described structure meets the impedance initial value model of reef beach geologic characteristics, carries out phased Application of Logging-constrained Inversion, obtains conventional Acoustic Impedance Data body.Comprise:
(1) utilize structure Fine structural interpretation layer position and layer data achievement to build sequence frame model accurately;
(2) take seismic facies and sedimentary facies as constraint, the well that adheres to different sedimentary facies belts separately is carried out respectively to well curvature correction and normalized, utilize interpolation and laterally matching extrapolation between sediment phase change line traffic control well, structure meets the phased initial model of reef beach geologic characteristics, as shown in Figure 2, the initial model that the phased modeling technique that the present invention adopts obtains, reflected accurately Xiang Jiao beach, carbonate platform edge reservoir in length and breadth to Distribution Characteristics, interpolation between well and extrapolation meet this district's geologic rule, and the model Lamellar character that conventional method obtains is obvious, " bulk with reef beach reservoir, horizontal change is fast " geologic feature be not inconsistent,
(3) utilize phased initial model to carry out Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body.
Step 3. described secondary modeling builds meticulousr phased initial model, carries out the phased wave impedance inversion of secondary and Gamma inversion, obtains reflecting the Acoustic Impedance Data body of pure reservoir.Comprise:
(1) carry out secondary Fine calibration and the reservoir preliminary interpretation of reservoir on conventional Acoustic Impedance Data body, determine top, the bottom boundary of reservoir, and then reservoir top, bottom boundary are added in the sequence frame model and carry out the phased modeling of secondary, build meticulousr impedance initial value model, carry out the secondary Study of The Impedence Inversion Restrained By Well Log;
(2) utilize secondaries Impedance Inversion data volume to carry out Gamma inversion as soft-constraint, setting rational gamma threshold value utilizes the gamma body to carry out filtering to secondaries Impedance Inversion data volume, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir.
Step 4. described extraction is hanged down the distribution range that wave impedance carrys out to determine Favorable Reservoir extremely, to carry out the Fine structural interpretation of reservoir under the constraint of seismic facies and sedimentary facies, by water channel between reef, backreef lagoon, low wave impedance muddy limestone rejecting in equiphase zone between beach, extract low wave impedance and extremely carry out to determine the distribution range of Favorable Reservoir, as shown in Figure 3, conventional inverting Acoustic Impedance Data can be identified the reef beach reservoir of large cover, but the reflection to interlayer is unclear, the inverting data that the phased inversion technique that the present invention adopts obtains can more clearly describe reef beach reservoir in length and breadth to the distribution minutia.
Step is the described reservoir parameter inversion of carrying out 5., and the factor of porosity of quantitative forecast reservoir and thickness distribution complete the fine description of reservoir.Comprise:
(1) correlationship between the Acoustic Impedance Data body of intersection analysis reservoir porosity and the pure reservoir of reflection, carry out reservoir parameter inversion, obtains the Prediction of Reservoir Porosity result;
(2) extract the objective interval factor of porosity in definite distribution of favorable reservoir district and be greater than 2.5% low wave impedance sampling point and add up and obtain reservoir time thickness, with Reservoir Interval Velocity, multiply each other and obtain the distribution of reservoir net thickness;
(3) carry out Comprehensive Evaluation of Reservoir on above-mentioned Prediction of Reservoir Porosity and thickness prediction achievement basis, complete the fine description of reservoir.
Claims (6)
1. a complicated reef flat reservoir predicting is characterized in that comprising the following steps:
1. meticulous depiction sedimentary facies modified line, determine the zone of interest Distribution of Sedimentary Facies;
2. build the impedance initial value model that meets reef beach geologic characteristics, carry out phased Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body;
3. the secondary modeling builds meticulousr phased initial model, carries out the phased wave impedance inversion of secondary and Gamma inversion, obtains reflecting the Acoustic Impedance Data body of pure reservoir;
4. extract low wave impedance and extremely carry out to determine the distribution range of Favorable Reservoir;
5. carry out reservoir parameter inversion, the factor of porosity of quantitative forecast reservoir and thickness, complete the fine description of reservoir.
2. a kind of complicated reef flat reservoir predicting according to claim 1 is characterized in that: the modified line of meticulous depiction sedimentary facies, determine the zone of interest Distribution of Sedimentary Facies, and comprise the following steps:
(1) carry out well shake Fine calibration, set up rational geologic model and carry out Seismic forward research, determine the seismic reservoir response characteristic, set up the seismic recognition pattern of reservoir and the seismic facies recognition mode of different sedimentary facies belts;
(2) seismic phase recognition mode in base area is carried out seismic phase analysis accurately, and the planar distribution feature of seismic phase, change into sedimentary facies in conjunction with drilling geology research by seismic facies definitely, accurately portrays the sedimentary facies modified line, determines zone of interest Distribution of Sedimentary Facies feature.
3. a kind of complicated reef flat reservoir predicting according to claim 1 and 2 is characterized in that: build the impedance initial value model that meets reef beach geologic characteristics, carry out phased Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body, comprise the following steps:
(1) utilize structure Fine structural interpretation layer position and layer data achievement to build sequence frame model accurately;
(2) take known geologic rule as guidance, take seismic facies and sedimentary facies as constraint, the well that adheres to different sedimentary facies belts separately is carried out respectively to well curvature correction and normalized, utilize interpolation and laterally matching extrapolation between sediment phase change line traffic control well, build the phased initial model that meets reef beach geologic characteristics;
(3) utilize phased initial model to carry out Application of Logging-constrained Inversion, obtain conventional Acoustic Impedance Data body.
4. a kind of complicated reef flat reservoir predicting according to claim 3, it is characterized in that: the secondary modeling builds meticulousr phased initial model, carry out the phased wave impedance inversion of secondary and Gamma inversion, obtain reflecting the Acoustic Impedance Data body of pure reservoir, comprise the following steps:
(1) carry out secondary Fine calibration and the reservoir preliminary interpretation of reservoir on conventional Acoustic Impedance Data body, determine top, the bottom boundary of reservoir, and then reservoir top, bottom boundary are added in the sequence frame model and carry out the phased modeling of secondary, build meticulousr impedance initial value model, carry out the secondary Study of The Impedence Inversion Restrained By Well Log;
(2) utilize secondaries Impedance Inversion data volume to carry out Gamma inversion as soft-constraint, setting rational gamma threshold value utilizes the gamma body to carry out filtering to secondaries Impedance Inversion data volume, remove the muddy limestone interlayer of high gamma, obtain reflecting the Acoustic Impedance Data body of pure reservoir.
5. a kind of complicated reef flat reservoir predicting according to claim 4, it is characterized in that: extract the distribution range that low wave impedance carrys out to determine Favorable Reservoir extremely, to carry out the Fine structural interpretation of reservoir under the constraint of seismic facies and sedimentary facies, by low wave impedance muddy limestone rejecting in equiphase zone between water channel, backreef lagoon, beach between reef, extract the distribution range that low wave impedance carrys out to determine Favorable Reservoir extremely.
6. a kind of complicated reef flat reservoir predicting according to claim 5,5. its feature carries out reservoir parameter inversion, and the factor of porosity of quantitative forecast reservoir and thickness complete the fine description of reservoir, comprise the following steps:
(1) correlationship between the Acoustic Impedance Data body of intersection analysis reservoir porosity and the pure reservoir of reflection, carry out reservoir parameter inversion, obtains the Prediction of Reservoir Porosity result;
(2) extract the objective interval factor of porosity in definite distribution of favorable reservoir district and be greater than 2.5% low wave impedance sampling point and add up and obtain reservoir time thickness, with Reservoir Interval Velocity, multiply each other and obtain the distribution of reservoir net thickness;
(3) carry out Comprehensive Evaluation of Reservoir on above-mentioned Prediction of Reservoir Porosity and thickness prediction achievement basis, complete the fine description of reservoir.
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