CN112305637A - Reconstruction method for ancient marine carbonate rock burial history - Google Patents
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- 238000009933 burial Methods 0.000 title claims abstract description 105
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 104
- 239000011435 rock Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 121
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 28
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 17
- 125000005587 carbonate group Chemical group 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000012937 correction Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 12
- 238000011065 in-situ storage Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 3
- 238000004861 thermometry Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 229910000514 dolomite Inorganic materials 0.000 description 6
- 239000010459 dolomite Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- 229910001748 carbonate mineral Inorganic materials 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The invention provides a reconstruction method of the burying history of ancient marine carbonate rocks. The method comprises the following steps: obtain the rock specimen that work area year measurement temperature measurement used, this rock specimen's characteristics include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample; determining the stage of the carbonate cement in the rock sample, and carrying out isotope year measurement on the carbonate cement of each stage to obtain the absolute age of the carbonate cement of each stage; carrying out cluster isotope test on the carbonate cement of each stage to obtain the formation temperature of the carbonate cement of each stage; acquiring a work area burial history curve; and (3) correcting the burial history curve of the work area by using the absolute age and the forming temperature of the secondary carbonate cement in each stage, and acquiring the burial history curve after correction of the work area, thereby completing the reconstruction of the burial history of the ancient marine carbonate rock.
Description
Technical Field
The invention belongs to the technical field of carbonate rock oil-gas exploration and evaluation methods in petroleum and natural gas geological exploration, and particularly relates to an ancient marine facies carbonate rock burial history reconstruction method.
Background
The paleo-geothermal history and the burial history of the exploration target layer series in the basin are geological backgrounds which are very important for researching the reservoir diagenetic-pore evolution history, the hydrocarbon source lithogenesis hydrocarbon discharge history and the oil and gas burial history, and the difference of the recognitions of the paleo-geothermal history and the burial history can cause the difference of the reservoir diagenetic-pore evolution history, the hydrocarbon source lithogenesis hydrocarbon discharge history and the burial history, so that the establishment of a reliable burial history model is very important for objectively knowing the oil and gas burial history. The restoration of basin burial history by predecessors is mainly based on parameters such as regional structure background, stratum contact relation, structure evolution, stratum thickness, denudation thickness, paleoterrestrial temperature gradient and the like, but the established burial history curve has great uncertainty due to different geological knowledge. For example, the recovery of the stratum denudation thickness and the ancient geothermal gradient and the knowledge of the structural development history, different scholars have different recognitions, particularly the ancient marine carbonate rocks in China which are located in the superposed basin underground structural layer and undergo complex structural movement, which directly restricts the establishment of a reliable basin burial history model.
Disclosure of Invention
The invention aims to provide a method capable of establishing a reliable buried history curve, which solves the problem of uncertainty of the buried history curve established by predecessors based on regional geological knowledge.
In order to achieve the above object, the present invention provides a method for reconstructing a burial history of ancient marine carbonate rocks, wherein the method comprises:
obtain work area and survey year temperature measurement and use rock specimen, the characteristics of work area survey year temperature measurement and use rock specimen include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample;
determining the stage of the carbonate cement in the rock sample, and carrying out isotope year measurement on the carbonate cement of each stage to obtain the absolute age of the carbonate cement of each stage; performing a cluster isotope (such as delta 47 temperature) test on the carbonate cement of each stage to obtain the formation temperature of the carbonate cement of each stage;
acquiring a work area burial history curve;
and correcting the buried history curve of the work area by using the absolute age of the subcarbonate cement of each stage and the formation temperature of the subcarbonate cement of each stage, and acquiring the buried history curve after correction of the work area, thereby finishing the reconstruction of the buried history and/or the ancient geothermal history of the ancient marine carbonate rock.
In the reconstruction method of the old marine carbonate rock burial history, the rock sample with the characteristics of hole development, filling of carbonate cement in the hole and mutual cutting of the carbonate cement in the rock sample is easy to establish a complete and reliable diagenetic sequence and is suitable for year measurement and temperature measurement; preferably, the carbonate cement bond characteristics and the reciprocal intersection relationship of the representative rock sample of the work area are clear.
In the above method for reconstructing the burial history of ancient marine carbonate rocks, it is preferable that the determination of the number of years of the carbonate cement intersected with each other in the rock sample is performed using a sample slice a made of a rock sample for temperature measurement of a working area year. More preferably, the thickness of the sample sheet a is 30 ± 5 μm.
In the above method for reconstructing a burial history of an ancient marine carbonate rock, preferably, the isotope dating is performed using a sample slice B made of a rock sample for dating in a workplace. More preferably, the thickness of the sample sheet B is 80 to 100 μm.
In the above method for reconstructing the old marine carbonate burial history, it is preferable that the cluster isotope test is performed using a powder sample of each stage of a subcarbonate cement.
In one embodiment, the method for reconstructing the ancient marine carbonate rock storage history comprises the following steps:
obtain work area and survey year temperature measurement and use rock specimen, the characteristics of work area survey year temperature measurement and use rock specimen include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample;
respectively preparing at least 2 parallel samples corresponding to the acquired annual temperature measurement rock samples in the work area, preparing sample sheets A and sample sheets B of the annual temperature measurement rock samples by using the parallel samples, and reserving residual parts of the parallel samples;
observing the carbonate cement of the sample slice A, and determining the period of the carbonate cement in the rock sample;
in the corresponding sample slice B, the carbonate cements of each stage corresponding to the carbonate cements of each stage in the sample slice A are defined, and the absolute age of the carbonate cements of each stage is obtained by isotope year measurement;
in the corresponding parallel sample residual part, obtaining a powder sample of carbonate cement of each stage corresponding to the carbonate cement of each stage in the sample slice A, and carrying out cluster isotope test to obtain the formation temperature of the carbonate cement of each stage;
acquiring a work area burial history curve;
correcting the burial history curve of the work area by using the absolute age of the secondary carbonate cement of each stage and the forming temperature of the secondary carbonate cement of each stage to obtain the burial history curve after correction of the work area, thereby completing the reconstruction of the burial history of the old marine carbonate rock;
preferably, the thickness of the sample sheet a is 30 ± 5 μm; in one embodiment, the sample sheet A has a thickness of 25-35 μm, such as 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm;
preferably, the sample slice a has a diameter of 1.5-2.5 cm;
preferably, the thickness of the sample sheet B is 80 to 100 μm;
preferably, the sample slice B has a diameter of 1.5-2.5 cm;
preferably, the preparation of at least 2 parallel samples corresponding to each annual thermometric rock sample is carried out in the following way: cutting the rock sample for measuring temperature in each year into cylinders with the diameter of 1.5-2.5cm and the thickness of 0.8cm, and making 2 parallel samples along two sides of a section;
preferably, the mirror image similarity of the sample slice A and the sample slice B is not lower than 90%; the consistency of the carbonate cement stages for year measurement and temperature measurement, and the one-to-one correspondence of age data and temperature data are ensured.
In the method for reconstructing the old marine carbonate burial history, the stage of the carbonate cement in the definite rock sample preferably comprises:
establishing a complete and reliable diagenetic sequence according to the mutual intersection relationship of the carbonate cements, and determining the period of the carbonate cements with the mutual intersection relationship;
carbonate cements that do not have an inter-relationship, as a single stage.
In the method for reconstructing the burying history of the ancient marine carbonate rock, preferably, the isotope dating is performed by using a laser in-situ U-Pb isotope dating mode.
In the above method for reconstructing the burial history of ancient marine carbonate rocks, preferably, the mass of the powder sample is not less than 10 mg.
In the above method for reconstructing the burial history of ancient marine carbonate rock, the powder sample may be obtained using a microdriller.
In the method for reconstructing the burial history of the ancient marine carbonate rock, the burial history curve of the work area is obtained according to the conventional technical means in the field, for example, the burial history curve of the work area is established according to the geological background, the drilling and the seismic data of the area.
In the above method for reconstructing the burial history of the ancient marine carbonate rock, preferably, the correcting the burial history curve of the work area using the absolute age of the subcarbonate cement of each stage and the formation temperature of the subcarbonate cement of each stage includes:
the absolute age of each stage of the sub-carbonate cement is put into a burial history curve to obtain the first burial depth of each stage of the sub-carbonate cement, and the formation temperature of each stage of the sub-carbonate cement is used for calculating the second burial depth of each stage of the sub-carbonate cement according to the geothermal gradient;
if the first burial depth and the second burial depth of the secondary carbonate cement at each stage are inconsistent, the burial history curve is unreliable, the burial history curve is modified to enable the burial depth of the secondary carbonate cement at each stage to be located at the second burial depth, and the curve corrected by the absolute age and the forming temperature of the secondary carbonate cement at each stage is used as the burial history curve corrected by the work area;
if the first burial depth of the subcarbonate cement at each stage is consistent with the second burial depth, the absolute age of the subcarbonate cement at each stage and the forming temperature of the subcarbonate cement at each stage are considered to form a mutual evidence-based relationship, the burial history curve is reliable, and the burial history curve is used as a burial curve model after correction of a work area.
Under the background of specific ancient geothermal history and burial history, the absolute age and formation temperature of the carbonate cement and the burial depth have good correspondence, if the burial history curve is reliable, the depth inverted according to the absolute age and the depth inverted according to the formation temperature are consistent, otherwise, the burial history curve can be continuously corrected through mutual evidence of the absolute age and the formation temperature, and finally, the reliable burial history curve is established.
Carbonate mineral isotope dating technique and cluster isotope (delta)47) The development of the temperature measurement technology provides possibility for the establishment of a reliable basin burial history curve in the technical scheme provided by the invention. The technical scheme provided by the invention establishes a reliable burying history curve by applying an isotope dating technology and a cluster isotope (delta 47) temperature measurement technology and mutually verifying test data, solves the problem of uncertainty of the burying history curve established by predecessors based on regional geological knowledge, and provides a reservoir diagenesis-pore evolution history, a hydrocarbon source rock hydrocarbon generation and discharge history and an oil gas temperature measurement historyThe research of the oil and gas reservoir history provides a reliable geological background, and realizes pore study before oil and gas migration, reservoir effectiveness evaluation, oil and gas reservoir formation period and reservoir formation effectiveness evaluation.
Drawings
Fig. 1 is a flow chart of a method for reconstructing the burial history of ancient marine carbonate rocks according to embodiment 1 of the present invention.
FIG. 2A is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-56-1 in example 1 of the present invention.
FIG. 2B is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-56-1 in example 1 of the present invention.
FIG. 3A is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-58-1-1 in example 1 of the present invention.
FIG. 3B is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-58-1-1 in example 1 of the present invention.
FIG. 4 is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-58-1-2 in example 1 of the present invention.
FIG. 5A is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-76-1 in example 1 of the present invention.
FIG. 5B is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-76-1 in example 1 of the present invention.
FIG. 6A is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-151-1 in example 1 of the present invention.
FIG. 6B is a graph of characteristics and diagenesis sequence of a Takenorthwest seismic denier system Qigonglake dolomitic reservoir sample Q-151-1 in example 1 of the present invention.
FIG. 7 is a graph of the King Gebraker set burial history of the tower in the northwest seismic system reconstructed in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in detail and completely with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a method for reconstructing a burial history of an ancient marine carbonate rock, which is used for carrying out reliable reconstruction of a burial history curve on an odd-Gebraker group of a seismic-denier system in northwest of a tower, providing a reliable geological background for researching the diagenesis-pore evolution history, the hydrocarbon generation and discharge history of hydrocarbon source rocks and the oil and gas burial history of an ancient marine carbonate rock reservoir, and realizing pore study before oil and gas migration, reservoir effectiveness evaluation, oil and gas burial period number and burial effectiveness evaluation, and specifically comprises the following steps as shown in figure 1:
step S1: obtain work area and survey year temperature measurement and use rock specimen, the characteristics of work area survey year temperature measurement and use rock specimen include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample;
the rock sample with the characteristics of hole development, filling of carbonate cement in the hole and mutual intersection of the carbonate cement in the rock sample is easy to establish a complete and reliable diagenetic sequence and is suitable for year measurement and temperature measurement.
Step S2: respectively preparing 2 parallel samples, namely a parallel sample A and a parallel sample B, corresponding to the rock sample for measuring the temperature of each year in the working area;
specifically, the rock sample for measuring temperature in each year is cut into cylinders with the diameter of 1.5-2.5cm and the thickness of 0.8cm, and 2 parallel samples are made along two sides of the section, one is a parallel sample A, and the other is a parallel sample B.
Step S3: preparing a parallel sample A corresponding to each annual temperature measurement rock sample in a work area into a sample slice A of the annual temperature measurement rock sample, preparing a parallel sample B corresponding to each annual temperature measurement rock sample into a sample slice B of the annual temperature measurement rock sample, and reserving the residual part of the parallel sample; wherein the thickness of the sample sheet A was 30 μm and the thickness of the sample sheet B was 100. mu.m.
Step S4: carrying out mirror image relation consistency screening on the sample slice A and the sample slice B of the rock sample for measuring temperature in each year;
specifically, a microscope is used for respectively observing the sample slice A and the sample slice B of the rock sample for measuring the temperature in each year, if the similarity of the mirror image relationship of the sample slice A and the sample slice B of a certain sample is not less than 90%, the sample slice A and the sample slice B are reserved, otherwise, the sample is removed;
the mirror image corresponding relation research of the thin slice A and the thin slice B ensures the consistency of the carbonate cement period for year measurement and temperature measurement and the one-to-one correspondence of age data and temperature data.
Step S5: observing the carbonate cement of the sample slice A, and determining the period of the carbonate cement in the rock sample;
specifically, the sample sheet A is subjected to carbonate cement observation, and the type, characteristics, duration and the like of the carbonate cement are mainly observed; establishing a complete and reliable diagenetic sequence according to the mutual intersection relationship of the carbonate cements, and determining the period of the carbonate cements with the mutual intersection relationship; carbonate cements that do not have a mutual cross-cut relationship, as a single stage;
the structural components of the dolomite of the odd-Gebraker group of the northwest seismic denier system of the tower are as follows from early to late in sequence: the method comprises the following steps of firstly, surrounding rock → fibrous annular edge dolomite → foliated dolomite → secondly, fine powder grain-shaped dolomite → middle coarse grain-shaped dolomite → sixth hydrothermal dolomite and quartz (shown in figures 2A-6B), and also comprises carbonate cementate with two phases of calcite structural components which are not mutually intersected with other structural components, wherein the carbonate cementate is used as calcite loaded in cracks and calcite loaded in holes in a single phase.
Step S6: in the corresponding sample slice B, the carbonate cements of each stage corresponding to the carbonate cements of each stage in the sample slice A are defined, and laser in-situ U-Pb isotope dating is carried out to obtain the absolute age of the carbonate cements of each stage; the results are shown in Table 1;
and (3) laser in-situ U-Pb isotope dating according to the specifications and requirements of the carbonate mineral laser in-situ U-Pb isotope dating technology.
TABLE 1 temperatures of different structural component cluster isotopes (Delta 47) of the Kigelac dolomites of the northwest seismic denier system of the tower
Step S7: in the corresponding parallel sample residual part, powder samples of carbonate cements of each stage corresponding to the carbonate cements of each stage in the sample slice A are drilled by a micro drill (the mass of each powder sample is 10mg), and cluster isotope (delta 47 temperature) test is carried out to obtain the formation temperature of the carbonate cements of each stage; the results are shown in Table 1;
if the residual part of the parallel sample corresponding to one rock sample cannot drill enough powder samples, the synchronous powder samples can be drilled through the residual parts of the parallel samples corresponding to a plurality of rock samples, so that the problem of insufficient powder sample amount is solved;
the cluster isotope (delta 47 temperature) test is carried out according to the specification and the requirement of the carbonate mineral cluster isotope (delta 47) temperature measurement technology.
Step S8: acquiring a work area burial history curve; correcting the burial history curve of the work area by using the absolute age of the subcarbonate cement of each stage and the forming temperature of the subcarbonate cement of each stage to obtain a corrected burial history curve of the work area (shown as a curve B in figure 7), thereby completing the reconstruction of the burial history of the ancient marine-phase carbonate rock;
specifically, the method comprises the following steps:
8.1, according to the geological background, well drilling and seismic data of the region, preliminarily establishing a buried history curve of the work area (shown as a curve A in figure 7);
8.2, the absolute age of the sub-carbonate cement of each stage is put into a burial history curve to obtain the first burial depth of the sub-carbonate cement of each stage, and the formation temperature of the sub-carbonate cement of each stage is calculated according to the geothermal gradient to obtain the second burial depth of the sub-carbonate cement of each stage;
if the first burial depth and the second burial depth of the secondary carbonate cement at each stage are inconsistent, the burial history curve is unreliable, the burial history curve is modified to enable the burial depth of the secondary carbonate cement at each stage to be located at the second burial depth, and the curve corrected by the absolute age and the forming temperature of the secondary carbonate cement at each stage is used as the burial history curve corrected by the work area;
if the first burial depth of the subcarbonate cement at each stage is consistent with the second burial depth, the absolute age of the subcarbonate cement at each stage and the forming temperature of the subcarbonate cement at each stage are considered to form a mutual evidence-based relationship, the burial history curve is reliable, and the burial history curve is used as a burial curve model after correction of a work area.
The temperature gradient of the cambrian-early Orotan earth is 3.2 ℃/3.5 ℃/100m, the temperature gradient of the prime mover-mud basin earth is 3.0 ℃/100m, the temperature gradient of the carbolite-eclipse earth is 3.0 ℃/100m, the temperature gradient of the triage-chalk end earth is 2.5 ℃/100m, and the temperature gradient of the new generation earth is 2.0 ℃/100 m. By correcting the absolute age of the U-Pb isotope and the temperature of the cluster isotope (Δ 47), a burial history curve (shown as a curve B in fig. 7) of the qigbu group of the township seismic system was established.
Claims (12)
1. A method for reconstructing the burying history of ancient marine carbonate rocks comprises the following steps:
obtain work area and survey year temperature measurement and use rock specimen, the characteristics of work area survey year temperature measurement and use rock specimen include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample;
determining the stage of the carbonate cement in the rock sample, and carrying out isotope year measurement on the carbonate cement of each stage to obtain the absolute age of the carbonate cement of each stage; carrying out cluster isotope test on the carbonate cement of each stage to obtain the formation temperature of the carbonate cement of each stage;
acquiring a work area burial history curve;
and correcting the burial history curve of the work area by using the absolute age of the subcarbonate cement of each stage and the formation temperature of the subcarbonate cement of each stage, and acquiring the burial history curve after correction of the work area, thereby completing the reconstruction of the burial history of the ancient marine carbonate rock.
2. The method of claim 1, wherein the determining the age of the intercrossed carbonate cement in the rock sample is performed using a sample slice a made from a field thermometry rock sample, the sample slice a having a thickness of 30 ± 5 μ ι η.
3. The method according to claim 1, wherein the isotope dating is performed using a sample slice B made of a rock sample for district dating, the thickness of the sample slice B being 80-100 μm.
4. The method of claim 1, wherein the performing a cluster isotope test is performed using a powder sample of each stage of a subcarbonate cement.
5. The method of claim 1, wherein the method comprises:
obtain work area and survey year temperature measurement and use rock specimen, the characteristics of work area survey year temperature measurement and use rock specimen include: the holes of the rock sample are developed, and carbonate cement is filled in the holes and is mutually intersected with the carbonate cement in the rock sample;
respectively preparing at least 2 parallel samples corresponding to the acquired annual temperature measurement rock samples in the work area, preparing sample sheets A and sample sheets B of the annual temperature measurement rock samples by using the parallel samples, and reserving residual parts of the parallel samples;
observing the carbonate cement of the sample slice A, and determining the period of the carbonate cement in the rock sample;
in the corresponding sample slice B, the carbonate cements of each stage corresponding to the carbonate cements of each stage in the sample slice A are defined, and the absolute age of the carbonate cements of each stage is obtained by isotope year measurement;
in the corresponding parallel sample residual part, obtaining a powder sample of carbonate cement of each stage corresponding to the carbonate cement of each stage in the sample slice A, and carrying out cluster isotope test to obtain the formation temperature of the carbonate cement of each stage;
acquiring a work area burial history curve;
correcting the burial history curve of the work area by using the absolute age of the secondary carbonate cement of each stage and the forming temperature of the secondary carbonate cement of each stage to obtain the burial history curve after correction of the work area, thereby completing the reconstruction of the burial history of the old marine carbonate rock;
preferably, the thickness of the sample sheet a is 30 ± 5 μm;
preferably, the sample slice a has a diameter of 1.5-2.5 cm;
preferably, the thickness of the sample sheet B is 80 to 100 μm;
preferably, the sample slice B has a diameter of 1.5-2.5 cm.
6. The method of claim 5, wherein the separately preparing at least 2 parallel samples corresponding to each of the annual thermometric rock samples is performed by: cutting the rock sample for measuring temperature in each year into cylinders with diameter of 1.5-2.5cm and thickness of 0.8cm, and making 2 parallel samples along two sides of the section.
7. The method of claim 5, wherein sample slice A has a mirror image similarity to sample slice B of no less than 90%.
8. The method of claim 4 or 5, wherein the mass of the powder-like is not less than 10 mg.
9. The method of any one of claims 1-8, wherein the stage of carbonate cement in the definitive rock sample comprises:
establishing a complete and reliable diagenetic sequence according to the mutual intersection relationship of the carbonate cements, and determining the period of the carbonate cements with the mutual intersection relationship;
carbonate cements that do not have an inter-relationship, as a single stage.
10. The method of any one of claims 1-8, wherein the isotope dating is performed using a laser in situ U-Pb isotope dating modality.
11. The method as claimed in any one of claims 1 to 8, wherein the obtaining of the work area burial history curve is carried out in the following manner:
and establishing a work area burial history curve according to the geological background, the drilling well and the seismic data of the area.
12. The method of any one of claims 1-8, wherein the correcting the work area burial history curve using the absolute age of each stage of the sub-carbonate cement and the formation temperature of each stage of the sub-carbonate cement comprises:
the absolute age of each stage of the sub-carbonate cement is put into a curve of the existing burying history to obtain the first burying depth of each stage of the sub-carbonate cement, and the forming temperature of each stage of the sub-carbonate cement is used for calculating the second burying depth of each stage of the sub-carbonate cement according to the geothermal gradient;
if the first burial depth and the second burial depth of the secondary carbonate cement at each stage are inconsistent, the burial history curve is unreliable, the burial history curve is modified to enable the burial depth of the secondary carbonate cement at each stage to be located at the second burial depth, and the curve corrected by the absolute age and the forming temperature of the secondary carbonate cement at each stage is used as the burial history curve corrected by the work area;
if the first burial depth of the subcarbonate cement at each stage is consistent with the second burial depth, the absolute age of the subcarbonate cement at each stage and the forming temperature of the subcarbonate cement at each stage are considered to form a mutual evidence-based relationship, the burial history curve is reliable, and the burial history curve is used as a burial curve model after correction of a work area.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112946780A (en) * | 2021-02-07 | 2021-06-11 | 中国石油天然气股份有限公司 | Method and device for determining sliding fracture active period |
| CN114137011A (en) * | 2021-12-10 | 2022-03-04 | 西南石油大学 | Method for rebuilding ancient deep dolomite in multi-stage diagenesis process |
| CN115128048A (en) * | 2021-03-25 | 2022-09-30 | 中国石油天然气股份有限公司 | Method and device for determining formation time of multi-stage carbonate cement |
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| CN115128048A (en) * | 2021-03-25 | 2022-09-30 | 中国石油天然气股份有限公司 | Method and device for determining formation time of multi-stage carbonate cement |
| CN115128048B (en) * | 2021-03-25 | 2024-05-28 | 中国石油天然气股份有限公司 | Method and device for determining formation time of multi-stage carbonate cement |
| CN114137011A (en) * | 2021-12-10 | 2022-03-04 | 西南石油大学 | Method for rebuilding ancient deep dolomite in multi-stage diagenesis process |
| CN114137011B (en) * | 2021-12-10 | 2024-05-14 | 西南石油大学 | Reconstruction method for multi-stage diagenetic process of ancient deep dolomite |
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