CN110555221A - Method and device for calculating lifting amplitude of regional stratum - Google Patents
Method and device for calculating lifting amplitude of regional stratum Download PDFInfo
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Abstract
A method and a device for calculating the lifting amplitude of regional strata are disclosed. The method and the device comprise the following steps: restoring the paleoburial depth of the regional stratum before and after the structural movement to obtain a two-stage paleoburial depth plane contour distribution map; carrying out plane gridding processing on the two-stage paleoburial depth data to obtain the paleoburial depth of each grid point; calculating the absolute lifting amplitude of the stratum before and after the structure movement according to the paleoburial depth of each grid point; obtaining the stratum lifting speed according to the absolute lifting amplitude and the geological time of the tectonic movement; and selecting the maximum absolute lifting amplitude generated by the tectonic movement to obtain the relative lifting amplitude of the stratum before and after the tectonic movement. The invention fully utilizes the advantages of the quantitative evaluation method to analyze the lifting and settlement amplitude of the stratum in the area, thereby greatly improving the breadth and the accuracy of the evaluation of the stratum structure movement.
Description
Technical Field
The invention relates to the technical field of tectonic geological analysis, in particular to a method and a device for calculating the lifting amplitude of a regional stratum.
Background
Formation and evolution of ancient structural features of the stratum, transformation of sedimentary facies, formation of fracture and unconformity surfaces and the like can be caused by structural movement of the regional stratum, and meanwhile, generation, transportation and gathering of oil and gas and adjustment and destruction of the later stage of an oil and gas reservoir can be promoted (Pao Guang et al, natural gas geoscience, No. 2 in 2000, Lu Yan Fang et al, No. 3 in 2001, Jun of gold and the like, China science D: geoscience, No. 5 in 2005). However, the process of the formation movement is very complicated, the movement result often generates a plurality of deformation states and related parameters, and the exact quantitative analysis of the formation movement composed of the deformation states is very difficult. In the basin level research range, the main forms of the formation movement are the lifting and the sedimentation of the stratum, the lifting amplitude of the formation movement basically reflects the strength of the formation movement, and the quantitative calculation of the lifting amplitude of the stratum has the advantages of relative simplicity, strong operability and the like.
At the present stage, the research on the formation lifting amplitude mainly focuses on the recovery of single-well buried history and the recovery of tectonic sedimentary evolution section, and the quantitative research on the lifting amplitude of regional formation is weak (tangxuan et al, front of geology, 2 nd 2008). According to the single well burial history recovery, known single well layering parameters are removed layer by layer according to the geological age from new to old, and geological elements such as deposition compaction, deposition discontinuity, stratum degradation and the like are considered in the degradation recovery process. According to the size of the stratum lifting in a certain geological period, the amplitude of the stratum lifting in unit time can be calculated. The method can be used for accurately calculating the lifting amplitude of the stratum of a certain well and the adjacent area, but the single-well calculation result has limitation and a small application range. The application range of the tectonic sedimentary evolution profile recovery is increased to a certain extent compared with the single-well buried history recovery, but the structural sedimentary evolution profile recovery still has great limitation, the application range is mainly concentrated in the area near the selected profile, and the requirement of the area quantitative analysis can not be met. Therefore, there is a need to develop a method and apparatus for quantitative analysis of the formation lifting amplitude in a region.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
the invention provides a method and a device for calculating the lifting amplitude of a regional stratum, which can reflect the actual situation of the lifting or the sedimentation of the stratum more accurately and comprehensively by establishing quantitative analysis of the lifting amplitude of the regional stratum and objectively reflect the structural movement strength of the regional stratum.
According to one aspect of the invention, a method of calculating the amplitude of lift of a formation in a zone is provided. The method comprises the following steps:
1) Restoring the paleoburial depth of the regional stratum before and after the structural movement to obtain a two-stage paleoburial depth plane contour distribution map;
2) Carrying out planar gridding treatment on the two-stage paleoburial depth contour distribution map, and obtaining the paleoburial depth of each grid point under the condition of unifying grid matrixes;
3) Calculating absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point obtained in the step 2);
4) Obtaining the stratum lifting speed according to the absolute lifting amplitude determined in the step 3) and the geological time of the tectonic movement;
5) And selecting the maximum absolute lifting amplitude generated by the tectonic movement to obtain the relative lifting amplitude of the stratum before and after the tectonic movement.
Preferably, in step 2), the two-stage paleoburial depth contour map is subjected to plane gridding processing by using a kriging interpolation method.
Preferably, in step 3), the absolute lifting amplitude R is obtained by the following formulaAbsolute：
RAbsolute＝H2-H1 (1)
Where H 1 is the paleo-depth of the formation before formation movement and H 2 is the paleo-depth of the formation after formation movement.
preferably, in step 4), the formation lift rate V is obtained by the following formula:
V＝RAbsolute/T (2)
wherein R isAbsoluteIs the absolute lifting amplitude and T is the geological time over which the formation moves.
preferably, in step 5), the relative formation lifting and lowering amplitude R is obtained by the following formulaRelative to each other：
RRelative to each other＝RAbsolute/max|RAbsolute| (3)
wherein R isAbsoluteIs the absolute lifting amplitude.
preferably, the method further comprises: and (5) compiling a plane distribution map of the absolute lifting amplitude, the lifting speed and the relative lifting amplitude of the regional stratum based on the data obtained in the steps 3), 4) and 5).
According to another aspect of the present invention, there is provided an apparatus for zonal formation lift amplitude, comprising:
The paleoburial depth recovery module is used for recovering the paleoburial depth of the regional stratum before and after the structure movement to obtain a two-stage paleoburial depth plane contour distribution map;
the gridding module is used for carrying out plane gridding processing on the two-stage paleoburial depth contour distribution map to obtain the paleoburial depth of each grid point;
The first calculation module is used for calculating the absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point;
The second calculation module is used for obtaining the stratum lifting speed according to the absolute lifting amplitude and the geological time of the tectonic movement;
And the third calculation module is used for selecting the maximum absolute lifting amplitude generated by the construction movement to obtain the relative lifting amplitude of the stratum before and after the construction movement.
Preferably, in the gridding module, planar gridding processing is performed on the two-stage paleoburial depth contour distribution map by using a kriging interpolation method.
Preferably, in the first calculation module, the absolute lifting amplitude R is obtained by the following formulaabsolute：
RAbsolute＝H2-H1 (1)
Where H 1 is the paleo-depth of the formation before formation movement and H 2 is the paleo-depth of the formation after formation movement.
Preferably, at the second calculation module, the formation lift rate V is obtained by the following formula:
V＝Rabsolute/T (2)
Wherein R isAbsoluteIs the absolute lifting amplitude and T is the geological time over which the formation moves.
Preferably, in the third calculation module, the formation relative lifting amplitude R is obtained by the following formulaRelative to each other：
Rrelative to each other＝RAbsolute/max|Rabsolute| (3)
Wherein R isabsoluteis the absolute lifting amplitude.
the method for quantitatively calculating the lifting amplitude of the regional stratum quantitatively calculates the absolute lifting amplitude, the lifting rate and the relative lifting amplitude of the regional stratum after the structural movement through regional stratum paleoburial depth recovery and data gridding treatment, can effectively improve the precision and the range of analysis of the lifting amplitude of the stratum, can provide an effective research method for analysis of the structural movement strength of the regional stratum, and can provide a favorable basis for evaluating the influence of the structural movement on the aspects of generation, migration, storage and the like of the oil and gas reservoir by combining the development characteristics of the oil and gas reservoir.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 is a flow chart illustrating the steps of a method of calculating the amplitude of lift of a zone formation according to the present invention;
FIG. 2 shows a schematic illustration of a zonal formation burial depth;
FIG. 3 shows a schematic diagram of areal stratigraphic paleoburial depth data plane meshing;
FIG. 4 is a diagram illustrating a quantitative calculation of absolute lifting amplitude at any point in a regional formation;
FIG. 5 shows a schematic diagram of a regional formation absolute amplitude of lift quantitative analysis;
FIG. 6 shows a schematic diagram of a regional formation lift rate quantitative analysis;
FIG. 7 shows a schematic diagram of a quantitative analysis of relative lifting and lowering amplitude of a regional formation.
Detailed Description
In order to meet the requirement of quantitative analysis of the movement intensity of the regional stratum structure, the invention provides a method and a device for quantitatively calculating the lifting amplitude of the regional stratum.
Carrying out ancient buried depth recovery work of the regional stratum before and after the structure movement by using data such as single-well buried history, structural sedimentary evolution profile and the like; carrying out plane gridding processing on the ancient buried depth contour distribution map by using a kriging interpolation method, so that the ancient buried depth data in the two periods have a condition that mathematical operation can be carried out in the vertical direction; on the basis, calculating the change difference of the ancient burial depth after the tectonic movement, wherein the change difference is the absolute value of the stratum lifting amplitude; dividing the absolute value by the geological time of the tectonic movement to obtain the lifting speed of the stratum; selecting the maximum lifting amplitude generated by the tectonic movement, and dividing the lifting amplitude of any position of the stratum by the maximum lifting amplitude to obtain a relative value of the lifting amplitude of the stratum; and compiling a planar distribution map of the absolute lifting amplitude, the lifting speed and the relative lifting amplitude of the regional stratum, thereby quantitatively analyzing the lifting amplitude of the regional stratum from multiple angles.
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
FIG. 1 is a flow chart illustrating the steps of a method of calculating the amplitude of lift of a zone formation according to the present invention. As shown in fig. 1, the method includes:
Step 1: and restoring the paleoburial depth of the regional stratum before and after the structure movement to obtain a two-stage paleoburial depth plane contour distribution map.
the paleoburial depth recovery of the regional stratum before and after the structure movement can utilize data such as single-well burial history, structure sediment evolution profile and the like to further obtain a two-stage paleoburial depth plane contour distribution map. It will be appreciated by those skilled in the art that the paleoburial depth plane contour map may also be obtained by other methods.
Fig. 2 is a schematic diagram of the paleoburial depth of the regional stratum obtained by performing paleoburial depth restoration.
Step 2: and carrying out plane gridding treatment on the two-stage paleoburial depth contour distribution map to obtain the paleoburial depth of each grid point.
And respectively carrying out plane gridding processing on the two-stage paleoburial depth contour distribution map by using a kriging interpolation method, so that the two-stage paleoburial depth data have a condition that mathematical operation can be carried out in the vertical direction. Because the two-stage paleoburial depth contour map obtained in the step 1 is in a bitmap form, vector data calculation of any point cannot be carried out, the contour map needs to be vectorized, the whole map is required to be gridded in the vectorization process, each point has a paleoburial depth value, most of grid points which do not fall on the contour line need to adopt a kriging interpolation method, namely, a point between two contour lines is subjected to proportional assignment according to the distance between the point and the two contour lines, the whole map is vectorized, and the grid matrixes adopted by the two-stage contour maps are consistent in size, so that the coordinates of each grid point correspond one to one, and the condition of mathematical operation of any point is met.
Fig. 3 is a schematic diagram of a gridding of the paleoburial depth data plane of the regional stratum.
and step 3: calculating absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point obtained in the step 2). FIG. 4 is a diagram illustrating quantitative calculation of absolute lifting/lowering amplitude at any point in a regional formation. As shown in FIG. 4, H1Is the ancient buried depth of the stratum before the structure movement, H2the ancient buried depth of the stratum after the structure movement can be obtained by the following formulaAbsolute：
Rabsolute＝H2-H1 (1)
if absolute lifting amplitude Rabsolutethe value is positive, which indicates that the stratum is settled after the structure moves; if the value is negative, the lifting of the ground is indicated. FIG. 5 is a diagram illustrating a quantitative analysis of absolute lifting amplitude of a zone formation. Connecting grid points with the same absolute lifting amplitude into a continuous curve according to the absolute lifting amplitude at each grid point obtained in the step 3) and the requirement of graph display to obtain the graph shown in the figure 5.
And 4, step 4: and obtaining the stratum lifting speed according to the absolute lifting amplitude determined in the step 3) and the geological time passed by the tectonic movement.
Specifically, the formation lift rate V is obtained by the following formula:
V＝RAbsolute/T (2)
wherein R isAbsoluteIs the absolute lifting amplitude, T is the structural movement originif the geological time is elapsed and the lifting speed V is a positive value, the lifting speed V represents the sedimentation speed of the stratum; if the value is negative, the lifting speed of the stratum is indicated. FIG. 6 is a schematic diagram of a regional formation lift rate quantitative analysis. And (3) connecting grid points with the same lifting speed into a continuous curve according to the stratum lifting speed at each grid point obtained in the step 4) and the requirement of graph display to obtain the graph shown in the figure 6. And 5: and selecting the maximum absolute lifting amplitude generated by the tectonic movement of each stage to obtain the relative lifting amplitude of the stratum of each stage.
Specifically, the relative formation lifting amplitude R is obtained by the following formulaRelative to each other：
RRelative to each other＝RAbsolute/max|Rabsolute| (3)
wherein R isAbsoluteIs the absolute lifting amplitude, the relative lifting amplitude RRelative to each otherIs a decimal fraction between 0 and 1, and has a relative lifting amplitude RRelative to each otherIf the value is positive, the relative amplitude of the stratum settlement is represented; if negative, it indicates the relative magnitude of the formation lift. FIG. 7 is a diagram illustrating a quantitative analysis of relative lifting and lowering amplitude of a zone formation. Connecting grid points with the same relative lifting amplitude into a continuous curve according to the relative lifting amplitude of the stratum at each grid point obtained in the step 5) and the requirement of graph display to obtain the graph shown in FIG. 7.
Application example
The quantitative analysis method for the lifting amplitude of the regional stratum provided by the invention has been primarily applied to Tarim basins and mainly carries out quantitative analysis on the lifting amplitude of the Ordovician stratum.
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
On the basis of the current burial depth of the Ordovician strata in the Tarim basin, ancient burial depths are researched, the ancient burial depths of the Ordovician strata at the end stage of the diadsic period and the Jurassic period are respectively restored, and fig. 2 is a schematic diagram of the ancient burial depths after restoration.
carrying out data plane gridding processing on ancient burial depths of the epothic period and the Jurassic period of the Ordovician strata by using a kriging interpolation method, and fig. 3 is a schematic data diagram after the processing and the plane gridding.
And (3) respectively calculating the absolute lifting amplitude of the stratums of the Ordovician system at the end of the eclipse period and the Jurassic period by using the plane gridding data, wherein a schematic diagram of the absolute lifting amplitude calculation result is shown in figure 5.
And calculating the lifting rate of the Ordovician stratum according to the absolute lifting amplitude data and the time (115 Ma at the end of the eclipse period to the end of the Jurassic period) of the tectonic movement, wherein the figure 6 is a schematic diagram of the calculation result of the absolute lifting rate.
Selecting the maximum absolute lifting amplitude (the final period of the diadsic period-the final period of the Jurassic period is 4500m) generated by the tectonic movement, and dividing the absolute lifting amplitude at any point by the maximum absolute lifting amplitude to obtain the relative lifting amplitude of the stratum, wherein fig. 7 is a schematic diagram of the calculation result of the relative lifting amplitude.
And compiling a plane distribution map of absolute lifting amplitude, lifting rate and relative lifting amplitude of the Talinum basin Ordovician stratum at the end of the diadsic period to the Jurassic period according to the calculated quantitative lifting amplitude data, so that the strength of the structural movement of the stratum is quantitatively analyzed in multiple angles.
The invention also provides a device for calculating the lifting amplitude of the regional stratum, which comprises the following components:
The paleoburial depth recovery module is used for recovering the paleoburial depth of the regional stratum before and after the structure movement to obtain a two-stage paleoburial depth plane contour distribution map;
The gridding module is used for carrying out plane gridding processing on the two-stage paleoburial depth contour distribution map to obtain the paleoburial depth of each grid point;
The first calculation module is used for calculating the absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point;
The second calculation module is used for obtaining the stratum lifting speed according to the absolute lifting amplitude and the geological time of the tectonic movement;
And the third calculation module is used for selecting the maximum absolute lifting amplitude generated by the construction movement to obtain the relative lifting amplitude of the stratum before and after the construction movement.
In one example, the absolute lifting amplitude R is obtained by the following formulaAbsolute：
RAbsolute＝H2-H1 (1)
Where H 1 is the paleo-depth of the formation before formation movement and H 2 is the paleo-depth of the formation after formation movement.
In one example, the formation lift rate V is obtained by the following equation:
V＝Rabsolute/T (2)
Where R is the absolute lifting amplitude and T is the geological time over which the formation moves.
In one example, the relative formation heave amplitude R is obtained by the following equationRelative to each other：
RRelative to each other＝Rabsolute/max|RAbsolute| (3)
Wherein R isAbsoluteIs the absolute lifting amplitude.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
In summary, the method for quantitatively calculating the lifting amplitude of the regional stratum provided by the invention quantitatively calculates the absolute lifting amplitude, the lifting rate and the relative lifting amplitude of the regional stratum after the structural movement through regional stratum burial depth recovery, data gridding treatment and the like, can effectively improve the precision and the range of stratum lifting amplitude analysis, can provide an effective research method for regional stratum structural movement intensity analysis, and can provide a favorable basis for evaluating the influence of the structural movement on the aspects of oil and gas reservoir generation, migration, storage and the like by combining with the oil and gas reservoir development characteristics. It is characterized in that:
(1) The multi-angle quantification and readability are good. Compared with a qualitative analysis method which can only predict the stratum lifting trend, the method can quantitatively analyze the stratum lifting amplitude, and represent the stratum lifting amplitude from three aspects of absolute lifting amplitude, lifting speed and relative lifting amplitude, and the formed quantitative data and the graph have good readability.
(2) Large information coverage and wide application range. Compared with the single-well stratum study method of single-well burial history and the well-connected stratum study method of tectonic sedimentary evolution profile, the method has the advantages that the study object is the regional stratum, the information coverage range is larger, and the formed result is wider in application range.
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A method of calculating a regional formation heave amplitude, comprising:
1) restoring the paleoburial depth of the regional stratum before and after the structural movement to obtain a two-stage paleoburial depth plane contour distribution map;
2) Carrying out planar gridding treatment on the two-stage paleoburial depth contour distribution map, and obtaining the paleoburial depth of each grid point under the condition of unifying grid matrixes;
3) Calculating absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point obtained in the step 2);
4) Obtaining the stratum lifting speed according to the absolute lifting amplitude determined in the step 3) and the geological time of the tectonic movement;
5) And selecting the maximum absolute lifting amplitude generated by the structure motion to obtain the relative lifting amplitude of the stratum of each point.
2. The method for calculating the lifting amplitude of the regional stratum according to the claim 1, wherein in the step 2), the paleoburial depth contour distribution map of the stratum before and after the tectonic movement is subjected to planar gridding by using a kriging interpolation method.
3. The method for calculating the formation raising and lowering amplitude of a zone according to claim 1, wherein in the step 3), the absolute raising and lowering amplitude R is obtained by the following formulaAbsolute：
RAbsolute＝H2-H1 (1)
where H 1 is the paleo-depth of the formation before formation movement and H 2 is the paleo-depth of the formation after formation movement.
4. The method for calculating the amplitude of formation lifting in an area according to claim 1, wherein in step 4), the formation lifting rate V is obtained by the following formula:
V＝RAbsolute/T (2)
Wherein R isabsoluteIs the absolute lifting amplitude and T is the geological time over which the formation moves.
5. The method for calculating the amplitude of formation lifting in an area according to claim 1, wherein in step 5), the relative lifting amplitude R of the formation is obtained by the following formularelative to each other：
RRelative to each other＝Rabsolute/max|RAbsolute| (3)
Wherein R isAbsoluteis the absolute lifting amplitude.
6. The method for calculating the lifting amplitude of the regional stratum according to the claim 1, characterized in that, based on the data obtained in the steps 3), 4) and 5), a plane distribution diagram of the absolute lifting amplitude, the lifting rate and the relative lifting amplitude of the regional stratum is compiled.
7. An apparatus for calculating amplitude of formation lift in a zone, comprising:
The paleoburial depth recovery module is used for recovering the paleoburial depth of the regional stratum before and after the structure movement to obtain a two-stage paleoburial depth plane contour distribution map;
The gridding module is used for carrying out plane gridding processing on the two-stage paleoburial depth contour distribution map to obtain the paleoburial depth of each grid point;
The first calculation module is used for calculating the absolute lifting amplitude of the stratum before and after the formation movement based on the paleoburial depth of each grid point;
the second calculation module is used for obtaining the stratum lifting speed according to the absolute lifting amplitude and the geological time of the tectonic movement;
And the third calculation module is used for selecting the maximum absolute lifting amplitude generated by the construction movement to obtain the relative lifting amplitude of the stratum before and after the construction movement.
8. the apparatus for calculating zonal formation elevation of claim 7, wherein the absolute elevation R is obtained by the following formulaAbsolute：
RAbsolute＝H2-H1 (1)
Where H 1 is the paleo-depth of the formation before formation movement and H 2 is the paleo-depth of the formation after formation movement.
9. The apparatus for calculating a zone formation drawdown amplitude as defined in claim 7 wherein the formation drawdown rate V is obtained by the formula:
V＝RAbsolute/T (2)
Wherein R isAbsoluteis the absolute lifting amplitude and T is the geological time over which the formation moves.
10. The apparatus for calculating zonal formation elevation of claim 7, wherein the formation relative elevation R is obtained by the following formulaRelative to each other：
RRelative to each other＝RAbsolute/max|RAbsolute| (3)
wherein R isAbsoluteIs the absolute lifting amplitude.
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Application publication date: 20191210 |