CN114578431A - Lithologic restoration method for ancient landform - Google Patents
Lithologic restoration method for ancient landform Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims abstract description 20
- 238000011160 research Methods 0.000 claims abstract description 15
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- 208000035126 Facies Diseases 0.000 claims description 9
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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- G01V1/36—Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
- G01V1/362—Effecting static or dynamic corrections; Stacking
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- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
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Abstract
The invention provides a lithology recovery method of ancient landform, which comprises the following steps: differential settlement correction of residual landform; fracture recovery; build-deposition cell partitioning; recovering the denudation amount; carrying out differential settlement correction and degradation amount recovery on the residual ancient landform, and perfecting ancient landform framework recovery in the sedimentation period; the type of the raised parent rock and the distribution of the residual parent rock are depicted; analyzing and counting the components of the drilling cuttings, counting the components of the drilling revealing rock core and the cuttings in the sedimentary area, and drawing a characteristic distribution diagram of the cuttings components; and qualitatively recovering the type and distribution of source region parent rocks during the deposition period, inverting the sink region rock debris back to the corresponding source region on the basis of source-sink unit division, correcting the lithology of the source region parent rocks, and correcting different parent rock distribution ranges according to the relative relationship of rock debris content to obtain a parent rock lithology and distribution recovery diagram. According to the invention, guidance is provided for researches on material distribution, landform evolution, reservoir characteristics, favorable reservoir body distribution and the like of the denudation and deposition areas by establishing the ancient landform and the prototype basin in the deposition period.
Description
Technical Field
The invention relates to the technical field of lithology restoration of ancient landforms in geophysical, in particular to a lithology restoration method of ancient landforms.
Background
The source of the area outside the basin has the characteristics of single source direction, long time for experiencing geological history, simple source evolution and transformation and the like. Compared with the source outside the basin, the low bulge covered in the later period in the basin is likely to be a source area in the early deposition period, the source supply and distribution of the dynamic source change along with the change of time, the source area changes in different sequence positions and different stages of the change of the lake plane, and the size of the source area changes, and meanwhile, the lithology of the denudated parent rock in different ancient landform positions also changes. The ancient landform shape determines the size of a source area and the total deposition amount of a deposition area, and the lithology of denudation mother rocks determines the original material composition of a reservoir, so that the quality of the reservoir is influenced.
The ancient landform restoration method mainly comprises a stripping method, an original slope angle restoration method, a fault analysis method and the like. The ancient landform restoration by the stripping method is one of the most common ancient landform restoration methods at present, and is also one of the ancient landform restoration methods with high reliability and operability.
Back stripping: based on the condition that the stratum thickness does not have obvious change in the later stage and the stratum does not have obvious degradation, the sedimentary recovery of the original landform focuses on the full analysis of stratum parameters and characteristics.
Original slope angle recovery method: based on a high-precision sequence stratigraphy theory, the isochronism of a sedimentary body and the change of a slope angle under the difference of sedimentary body and sedimentary landform sedimentary modes in low-position, sea invasion and high-position periods are emphasized, the original ancient landform can be restored from new to old under the change of the slope angle, and an original landform pattern which is not degraded and reformed in a stratum can be restored by an original slope angle restoration method.
And (3) fault analysis: the differential analysis of fracture activities and landform patterns in different periods is carried out aiming at a research area with strong structural motion influence, the spatial and temporal evolution difference of fracture and ancient landform in different periods is determined, and the full analysis of fault activity parameters in a basin and associated with low bulges is realized. The fault analysis method is one of the most effective methods for researching the restoration of ancient landforms related to fault-related delta development in areas with strong fracture activities in pots.
The main methods for recovering the parent rock include zircon dating method and gravel component tracing method. The zircon dating method can obtain a plurality of groups of U-Pb ages through the U-Pb dating of zircon, and can give cause mechanisms of different zircon crystal domains and more reasonable geological explanation to the ages by comprehensively researching the internal structure, trace element characteristics and inclusion components of a system in different regions of the zircon.
The gravel component tracing method qualitatively judges the combination pattern of the sedimentary mother rock by counting the gravel components and contents in the drill core or rock debris revealed by well drilling in the sedimentary region, and the gravel component contents can reflect the lithology characteristics of the source region mother rock macroscopically.
The former research method mainly aims at the restoration of the degradation amount and the ancient landform of the sedimentary stratum, does not consider the influence of a degradation area, has certain limitation, does not consider the influence of lithological dimensionality on the reservoir, cannot effectively and accurately restore the ancient source in the sedimentary period, and greatly influences the judgment of a high-quality reservoir.
Disclosure of Invention
The invention provides a lithology recovery method of ancient landforms, which aims to solve the technical problem that the ancient source recovery is insufficient due to the fact that the degradation of mother rocks, the landforms and the lithology scale in the deposition period is not considered in the prior art.
In order to solve the above problems, the present invention provides a lithology restoration method for ancient landforms, including:
S1: difference in residual landformCorrecting differential settlement;
by analyzing the fracture activity difference and sedimentary stratum thickness evolution rule in different periods, the differential settlement rule and the sedimentary datum plane are determined, and the differential settlement is corrected;
S2: fracture recovery;
identifying and analyzing fractures in a research area, performing fracture translation recovery aiming at later-stage activity fracture and having great influence and transformation effect on a geomorphic grid, and recovering watershed positions at each stage;
S3: build-deposition cell partitioning;
on the basis of residual landform portrayal after fracture recovery and watershed position recovery at each stage, different key deposition period structure-deposition units are divided;
S4: recovering the denudation amount;
defining the scope of the denudation area, the super denudation area and the denudation area, defining the denudation scope in different periods, and completing the denudation amount recovery of the denudation area and the super denudation area by a total material conservation principle and a stratum inclination angle recovery method under the control of a source-sink system;
S5: the differential settlement correction and the denudation amount recovery of the residual ancient landform are completed, the ancient landform framework recovery in the sedimentation period is perfected,
the denudation amount is denuded back to the convex area, and landforms in the differential settlement area are superposed to complete restoration of the ancient landform grillwork in the settlement period;
S6: the type of the raised parent rock and the distribution of the residual parent rock are depicted;
the lithology and the age of the parent rock are judged by using rock debris, gravels, heavy minerals and zircon, well-seismic combination is carried out, seismic facies characteristics of different parent rocks are calibrated by using well-seismic, distribution boundaries of different types of parent rocks are qualitatively identified on a plane, and distribution of residual parent rocks in a source region is depicted;
S7: analyzing and counting the components of the drilling cuttings;
performing petrology analysis on the well drilling in the sedimentary area, and finely dividing and counting the rock debris composition;
S8: qualitative recovery of source zone parent rock type and branch during deposition periodCloth;
according to the type and content statistics of the rock debris, qualitatively recovering the type and the distribution range of the parent rock in the raised source region in the deposition period, and semi-quantitatively predicting the main components of the sediment gravel.
Preferably, in step S1The differential settlement correction method specifically comprises: and selecting a planarizing plane as a deposition reference surface, carrying out layer leveling treatment on the deposition reference surface, and correcting the differential settlement amount at the later deposition stage.
Preferably, in step S2The specific method for fracture recovery comprises:
step S21: analyzing the fracture activity period according to the attribution of the fractured upper and lower tray stratums, and performing fracture translation recovery on the fracture of later activity;
step S22: counting the total distance L, the total distance H, the fault angle alpha and the distances H1, H2 and H3 between the watershed of the residual landform and the water outlet, and calculating the position of the watershed of each period, wherein:
La＝H/tanα (1)
Le＝L-La (2)
La1＝La*h1/(h1+h2+h3) (3)
Le1＝Le*h1/(h1+h2+h3) (4)
L1＝La1+Le1 (5)
wherein: la is the total horizontal tilt distance; le is the total tracing erosion distance; la1 is the horizontal tilt distance at each time period; le1 is the erosion distance of each period source tracing; l1 is the distance of the watershed from the water outlet at each time period.
Preferably, in step S3The specific method for constructing-depositing unit division comprises the following steps:
step S31: dividing the structure-deposition units according to the watershed, the watershed line and the protruding group boundary line;
step S32: and establishing a corresponding relation between the source system and the deposition system of each bump group.
Preferably, in step S4The specific method for restoring the denudation amount comprises the following steps:
step S41: identifying an ablation area, a super-ablation area and a super-coverage area;
step S42: and recovering the denudation amount of the super denudation area by using a stratum trend method, and recovering the denudation amount of the denudation area by using a stratum trend method and a volume inversion method.
Preferably, in step S5The specific method for correcting the differential settlement of the residual ancient landform and recovering the denudation amount and perfecting the ancient landform framework recovery in the sedimentation period comprises the following steps: and after the watershed position and the total amount of the denudation are determined, the denudation amount is stripped back to the residual relief area of the fractured recovered landform according to the corresponding denudation-deposition corresponding unit and the deposition area corrected by differential settlement is superposed, so that the ancient landform framework recovery in the deposition period is completed.
Preferably, in step S6The specific method for depicting the type of the raised parent rock and the distribution of the residual parent rock comprises the following steps:
step S61: well seismic calibration is carried out on the well seismic profile of the research area,
step S62: the seismic facies differences of different parent rocks are statistically analyzed,
step S63: establishing a seismic facies identification chart of the basement mother rock type,
step S64: and tracking the distribution boundaries of different parent rocks on a plane to finish the source region parent rock distribution portrayal.
Preferably, in step S7The specific method for analyzing and counting the components of the drilling cuttings comprises the following steps: and performing petrological analysis on the drilling rock debris in different unit convergence regions on the basis of source-sink unit division, finely dividing the rock debris composition, and counting the relative content of each component.
Preferably, in step S8The specific method for qualitatively recovering the type and distribution of source zone parent rocks in the deposition period comprises the following steps:
step S81: reversely deducing the area proportion of the corresponding parent rock source region according to different gravel content proportions;
step S82: semi-quantitatively recovering the distribution range of the parent rocks in the raised source region in the deposition period;
step S83: according toSand formation index formula SGIA (A + B) ═ SA + SB]SA (SGIA (A + B) is a source region consisting of lithology A and lithology B, and the main component of deposited gravel is predicted in a semi-quantitative mode;
wherein SGIA (A + B) is the sand formation index of lithology A; SA + SB is the total source area; SA is the source region area of lithology A.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and is embodied in the following aspects:
1. when the ancient landform is restored, the change of the landform form caused by the tectonic movement is considered, and the restoration of the tectonic movement is supplemented, so that the restoration of the landform is more scientific and accurate; the source-sink unit structure is changed by the later-stage fracture activity, the geomorphic pattern of the source region after denudation can be reflected more truly aiming at the quantitative recovery of the fractures, and the structural unit division on the basis is more scientific and accurate.
2. Based on landform-lithology restoration under a source-sink system framework, a good framework is created for research and differentiation of source and material foundation research of each structure-deposition unit. The denudation amount and the denudation mother rock are related to the sedimentary material, so that a new basis is provided for the development of a favorable reservoir stratum. The types, the source strength, the sedimentary system distribution and the space-time evolution rules of the types, the source strength and the sedimentary system of the mother rocks of each structure-sedimentary unit can be clearly and visually expressed on a restored prototype basin, favorable reservoirs in oil exploration can be directly guided and predicted, a method with strong operability and intuition is provided for landform-lithology restoration by using well seismic data, the problem of ordering of the favorable reservoirs in the reservoir source restoration and the sedimentary area based on the well seismic data in the oil and gas exploration is solved, and the method has wide application and wide market prospect.
Drawings
FIG. 1 is a flowchart illustrating steps of a method for recovering ancient landform lithology according to an embodiment of the present invention;
FIG. 2 is a graph of the residual difference settlement of ancient landforms in an embodiment of the present invention;
FIG. 3 is a schematic representation of the fracture lattice profile restoration in an embodiment of the present invention;
FIG. 4 is a graph showing the plane restoration results of the fracture system in the example of the present invention;
FIG. 5 is a diagram illustrating the quantitative calibration of the structuring-deposition cell segmentation and fracturing system in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the identification of the denudation area, the super denudation area and the super coverage area and the denudation amount recovery in the embodiment of the present invention;
FIG. 7 is a plan view of the restoration of the amount of denudation in an embodiment of the present invention;
FIG. 8 is a diagram illustrating the restoration of ancient geomorphic images during deposition period according to an embodiment of the present invention;
FIG. 9 is a plot of a well seismographic lithology calibration in an embodiment of the invention;
FIG. 10 is a superimposed view of the residual parent rock type and topographic profile in an embodiment of the present invention;
FIG. 11 is a plan view of a feature profile of a rock fragment composition according to an embodiment of the present invention;
fig. 12 is a diagram of checking paleogeomorphology-lithology information and key wells of a sand-forming index recovery source area in the embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, an embodiment of the present invention provides a lithology restoration method for an ancient landform, including the following steps:
S1: differential settlement correction of residual landform;
by analyzing the fracture activity difference and sedimentary stratum thickness evolution rule in different periods, the differential settlement rule and the sedimentary datum plane are determined, and the differential settlement is corrected.
As shown in fig. 2, in the present embodiment, the differential settlement amount correction is performed on the residual topography of the underlying critical period by the reference level leveling method, and the differential settlement correction result is shown in the figure.
S2: fracture recovery;
and (4) carrying out fracture translation recovery and recovering watershed positions in each period aiming at later-stage activity fracture and having great influence and transformation effect on the landform grillwork.
As shown in fig. 3, fracture translation recovery is performed on the seismic workstation, and the recovered seismic interpretation data is exported to a graph, so that a fracture recovery result graph as shown in fig. 4 can be obtained.
S3: build-deposition cell partitioning;
and on the basis of residual topographic relief after fracture recovery and watershed position recovery at each stage, constructing-depositing units at different key depositing periods.
Specifically, in the present embodiment, on the fracture recovery result graph shown in fig. 4, the watershed lines, the ridge lines, and the denudation boundary lines of the research area are picked up, and in the denudation area, the ancient landforms after fracture recovery are further divided into first-level, second-level, and third-level source-sink units based on the watershed lines and the watershed lines, so as to complete the division of the structure-deposition units, and further quantitatively check the rotating and tilting landforms for the movable fault blocks.
S4: restoring the denudation amount;
and (5) stripping the stripping amount back to the convex area, and overlapping the landform of the differential settlement area to finish the restoration of the ancient landform grillwork in the settlement period.
Specifically, in the present embodiment, as shown in fig. 6 and 7, the denudation area (stratum without deposition), the super denudation area (early-stage deposition, late-stage ablation, simultaneous occurrence of the super-coverage and the denudation phenomena), and the super-coverage area (stratum deposition, no denudation phenomena) are identified. And aiming at the denudation amount of the denudation area and the super denudation area, different methods are selected for recovery. For the super-peeling area, a stratum extension method is selected according to the diagram shown in fig. 6 to recover the peeling amount; for the ablation area, on the premise of ensuring that the watershed lines, the watershed lines and the ridge lines are stable and unchanged, the total amount of the material is recovered by a trend extension method and a volume inversion method with the unchanged total amount of the material, and the ablation amount recovery graph shown in fig. 7 is obtained by recovering the ablation amount of the ablation area and the super-ablation area.
S5: carrying out differential settlement correction and degradation amount recovery on the residual ancient landform, and perfecting ancient landform framework recovery in the sedimentation period;
in the embodiment, as shown in FIG. 8, in step S1Corrected for differential settlementOn the basis of ancient landform, the step S4And respectively overlapping the total amount of the denudation of the middle denudation area and the total amount of the denudation of the super denudation area to the areas where the denudation areas are located, performing overlapping operation of interfaces, and finally completing the restoration of the ancient geomorphic grid in the deposition period.
S6: and (3) depicting the type of the raised parent rock and the distribution of the residual parent rock:
the lithology and the age of the parent rock are judged by using rock debris, gravels, heavy minerals and zircon, well-seismic combination is adopted, seismic facies characteristics of different parent rocks are calibrated by using well-seismic, distribution boundaries of different types of parent rocks are qualitatively identified on a plane, and distribution of residual parent rocks in a source region is depicted.
Specifically, in the present embodiment, as shown in fig. 9 and 10, after the well seismic calibration shown in fig. 9 according to the regional research and the lithology of the drilling well, the lithology boundaries of different parent rocks are tracked in the seismic workstation, so as to obtain the remaining parent rock type and landform distribution characteristic diagram shown in fig. 10.
S7: analyzing and counting the components of the drilling cuttings;
and performing petrology analysis on the well drilling in the sedimentary area, and finely dividing and counting the rock debris composition.
Specifically, in this embodiment, as shown in fig. 11, the sedimentary region well drilling is counted, the rock core and the rock debris components are revealed, and a rock debris component characteristic distribution diagram is drawn, that is, the rock debris component characteristic distribution diagram.
S8: qualitatively recovering the type and distribution of source zone parent rocks during the deposition period;
according to the type and content statistics of the rock debris, qualitatively recovering the type and the distribution range of the parent rock in the raised source region in the deposition period, and semi-quantitatively predicting the main components of the sediment gravel.
Specifically, in this embodiment, as shown in fig. 12, on the basis of source-sink unit division, sink-region rock debris is inverted back to a corresponding source region, the lithology of the parent rock in the source region is corrected, and different parent rock distribution ranges are corrected according to the relative relationship of rock debris content, so as to obtain a parent rock lithology and distribution recovery diagram shown in fig. 12. Calculated according to a sand formation index formula, the gravel content of the BZ26-5-1 well is mainly carbonate rock and is consistent with the well drilling disclosure.
It should be noted that the source-sink system is a hot spot developed in the field of deposition science in recent years, and the mutual coupling relationship among the source region, the carrying region and the deposition region is mainly studied. The terrestrial basin ground source-sink system analyzes a source system and a deposition system based on a landform angle, and can visually find out the direct corresponding relation between the denudation area and the deposition area and the response difference under different boundary conditions. The core of the terrestrial basin ground source-sink system research is the quantitative-semi-quantitative characterization of the response relationship between the research material source and the sedimentary material, and is the foundation of ancient landform-lithology dual recovery in the sedimentary period.
The invention utilizes the core thought of quantitative research of the latest source-sink system to finish the landform and lithology restoration in sequence. Firstly, selecting a deposition reference surface to carry out differential settlement correction, analyzing and recovering fractures in the residual landform, carrying out construction-deposition unit division on the residual ancient landform after fracture recovery, determining a material source and a material total amount, carrying out ablation amount recovery on the material total amount and the material source in an ablation area by calibrating an ablation range and a deposition volume, and completing the recovery of the ancient landform in a key period; secondly, the source region parent rock types are counted through investigation and well drilling, different parent rock seismic facies characteristics are calibrated by utilizing the well drilling, planar parent rock distribution boundary delineation is developed, the well drilling cuttings components in the sink region are subjected to fine analysis and statistics, the source region parent rock types and the distribution range are corrected according to the corresponding relation between the source region parent rock types and the source region, and finally, the landform-lithology recovery result is perfected on the basis of landform recovery.
Specifically, in step S1The differential settlement correction method specifically comprises: and selecting a planarizing plane as a deposition reference surface, carrying out layer leveling treatment on the deposition reference surface, and correcting the differential settlement amount at the later deposition stage.
Specifically, in step S2The method for fracture recovery specifically comprises:
step S21: analyzing the fracture activity period according to the attribution of the fractured upper and lower strata, and performing fracture translation recovery on the fracture of later activity;
step S22: counting the total distance L, the total distance H, the fault angle alpha and the sum of the watershed and the water outlet of the residual landformCalculating the positions of watersheds of each period by the distance h1, h2 and h3 of each period, wherein:
La＝H/tanα (1)
Le＝L-La (2)
La1＝La*h1/(h1+h2+h3) (3)
Le1＝Le*h1/(h1+h2+h3) (4)
L1＝La1+Le1 (5)
wherein: la is the total horizontal tilt distance; le is the total tracing erosion distance; la1 is the horizontal tilt distance at each time period; le1 is the source erosion distance of each period; l1 is the distance from the watershed to the water outlet in each period.
Specifically, in step S3The specific method for constructing-depositing unit division comprises the following steps:
step S31: dividing the structure-deposition units according to the watershed, the watershed line and the protruding group boundary line;
step S32: and establishing a corresponding relation between the source system and the deposition system of each bump group.
Specifically, in step S4The specific method for restoring the denudation amount comprises the following steps:
step S41: identifying an ablation area, a super-ablation area and a super-coverage area;
step S42: and recovering the denudation amount of the super denudation area by using a stratum trend method, and recovering the denudation amount of the denudation area by using a stratum trend method and a volume inversion method.
Specifically, in step S5In the method, the specific method for correcting the differential settlement of the residual ancient landform and restoring the denudation amount and perfecting the ancient landform framework restoration in the sedimentation period comprises the following steps: and after the watershed position and the total amount of the denudation are determined, the denudation amount is stripped back to the residual relief area of the fractured recovered landform according to the corresponding denudation-deposition corresponding unit and the deposition area corrected by differential settlement is superposed, so that the ancient landform framework recovery in the deposition period is completed.
Specifically, in step S6The specific method for depicting the type of the raised parent rock and the distribution of the residual parent rock comprises the following steps:
step S61: well seismic calibration is carried out on the well seismic profile of the research area,
step S62: the seismic facies differences of different parent rocks are statistically analyzed,
step S63: establishing a seismic facies identification chart of the basement mother rock type,
step S64: and tracking the distribution boundaries of different parent rocks on a plane to finish the source region parent rock distribution portrayal.
Specifically, in step S7The specific method for analyzing and counting the components of the drilling cuttings comprises the following steps: and performing petrological analysis on the drilling rock debris in different unit convergence regions on the basis of source-sink unit division, finely dividing the rock debris composition, and counting the relative content of each component.
Specifically, in step S8The specific method for qualitatively recovering the type and distribution of source zone parent rocks in the deposition period comprises the following steps:
step S81: reversely deducing the area occupation ratio of the corresponding parent rock source region according to different gravel content occupation ratios;
step S82: semi-quantitatively recovering the distribution range of the parent rocks in the raised source region in the deposition period;
step S83: according to the formula of sand formation index SGIA (A + B) ═ SA + SB]the/SA (SGIA (A + B) is a source region consisting of lithology A and lithology B, and is used for semi-quantitatively predicting the main component of deposited gravel;
wherein SGIA (A + B) is the sand formation index of lithology A; SA + SB is the total source area; SA is the source region area of lithology A.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (9)
1. A lithology restoration method for ancient landforms is characterized by comprising the following steps:
S1: differential settlement correction of residual landform;
by analyzing the fracture activity difference and sedimentary stratum thickness evolution rule in different periods, the differential settlement rule and the sedimentary datum plane are determined, and the differential settlement is corrected;
S2: fracture recovery;
identifying and analyzing fractures in a research area, performing fracture translation recovery aiming at later-stage activity fracture and having great influence and transformation effect on a geomorphic grid, and recovering watershed positions at each stage;
S3: build-deposition cell partitioning;
on the basis of residual landform portrayal after fracture recovery and watershed position recovery at each stage, different key deposition period structure-deposition units are divided;
S4: recovering the denudation amount;
defining the scope of the denudation area, the super denudation area and the denudation area, defining the denudation scope in different periods, and completing the denudation amount recovery of the denudation area and the super denudation area by a total material conservation principle and a stratum inclination angle recovery method under the control of a source-sink system;
S5: the differential settlement correction and the denudation amount recovery of the residual ancient landform are completed, the ancient landform framework recovery in the sedimentation period is perfected,
the denudation amount is denuded back to the convex area, and landforms in the differential settlement area are superposed to complete restoration of the ancient landform grillwork in the settlement period;
S6: the type of the raised parent rock and the distribution of the residual parent rock are depicted;
the lithology and the age of the parent rock are judged by using rock debris, gravel, heavy minerals and zircon, well-seismic combination is performed, seismic facies characteristics of different parent rocks are calibrated by using well-passing seismic, distribution boundaries of different types of parent rocks are qualitatively identified on a plane, and distribution of residual parent rocks in a source region is depicted;
S7: analyzing and counting the components of the drilling cuttings;
performing petrology analysis on the well drilling in the sedimentary area, and finely dividing and counting the rock debris composition;
S8: qualitatively recovering the type and distribution of source zone parent rocks during the deposition period;
according to the type and content statistics of the rock debris, qualitatively recovering the type and the distribution range of the parent rock in the raised source region in the deposition period, and semi-quantitatively predicting the main components of the sediment gravel.
2. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S1The differential settlement correction method specifically comprises: and selecting a planarizing plane as a deposition reference surface, carrying out layer leveling treatment on the deposition reference surface, and correcting the differential settlement amount at the later deposition stage.
3. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S2The specific method for fracture recovery comprises:
step S21: analyzing the fracture activity period according to the attribution of the fractured upper and lower tray stratums, and performing fracture translation recovery on the fracture of later activity;
step S22: counting the total distance L, the total distance H, the fault angle alpha and the distances H1, H2 and H3 between the watershed of the residual landform and the water outlet, and calculating the position of the watershed of each period, wherein:
La＝H/tanα (1)
Le＝L-La (2)
La1＝La*h1/(h1+h2+h3) (3)
Le1＝Le*h1/(h1+h2+h3) (4)
L1＝La1+Le1 (5)
wherein: la is the total horizontal tilt distance; le is the total tracing erosion distance; la1 is the horizontal tilt distance at each time period; le1 is the erosion distance of each period source tracing; l1 is the distance from the watershed to the water outlet in each period.
4. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S3The specific method for constructing-depositing unit division comprises the following steps:
step S31: dividing the structure-deposition units according to the watershed, the watershed line and the protruding group boundary line;
step S32: build each convexAnd (3) corresponding relation between the clustering source system and the deposition system.
5. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S4The specific method for restoring the denudation amount comprises the following steps:
step S41: identifying an ablation area, a super-ablation area and a super-coverage area;
step S42: and recovering the denudation amount of the super denudation area by using a stratum trend method, and recovering the denudation amount of the denudation area by using a stratum trend method and a volume inversion method.
6. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S5In the method, the specific method for correcting the differential settlement of the residual ancient landform and restoring the denudation amount and perfecting the ancient landform framework restoration in the sedimentation period comprises the following steps: and after the watershed position and the total amount of the denudation are determined, the denudation amount is stripped back to the residual relief area of the fractured recovered landform according to the corresponding denudation-deposition corresponding unit and the deposition area corrected by differential settlement is superposed, so that the ancient landform framework recovery in the deposition period is completed.
7. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S6The specific method for depicting the type of the raised parent rock and the distribution of the residual parent rock comprises the following steps:
step S61: carrying out well seismic calibration on a well seismic profile of a research area;
step S62: carrying out statistical analysis on the seismic phase difference of different parent rocks;
step S63: establishing a basement mother rock type seismic facies identification chart;
step S64: and tracking the distribution boundaries of different parent rocks on a plane to finish the source region parent rock distribution portrayal.
8. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S7In the well bore cuttingsThe specific method for analyzing and counting the components comprises the following steps: and performing petrological analysis on the drilling rock debris in different unit convergence regions on the basis of source-sink unit division, finely dividing the rock debris composition, and counting the relative content of each component.
9. The method for restoring lithology of ancient landforms according to claim 1, wherein in step S8The specific method for qualitatively recovering the source region parent rock type and distribution in the sedimentary period comprises the following steps:
step S81: reversely deducing the area occupation ratio of the corresponding parent rock source region according to different gravel content occupation ratios;
step S82: semi-quantitatively recovering the distribution range of the parent rocks in the raised source region in the deposition period;
step S83: according to the formula of sand formation index SGIA (A + B) ═ SA + SB]the/SA (SGIA (A + B) is a source region consisting of lithology A and lithology B, and is used for semi-quantitatively predicting the main component of deposited gravel;
wherein SGIA (A + B) is the sand formation index of lithology A; SA + SB is the total source area; SA is the source region area of lithology A.
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