CN116879945A - Stratum pinch-out line prediction method based on geological-seismic combination - Google Patents

Stratum pinch-out line prediction method based on geological-seismic combination Download PDF

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CN116879945A
CN116879945A CN202310734691.7A CN202310734691A CN116879945A CN 116879945 A CN116879945 A CN 116879945A CN 202310734691 A CN202310734691 A CN 202310734691A CN 116879945 A CN116879945 A CN 116879945A
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pinch
stratum
out line
geological
seismic
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熊亮
宋晓波
隆轲
蔡左花
刘勇
苏成鹏
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China Petroleum and Chemical Corp
Sinopec Southwest Oil and Gas Co
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China Petroleum and Chemical Corp
Sinopec Southwest Oil and Gas Co
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/282—Application of seismic models, synthetic seismograms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/30—Analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/30—Analysis
    • G01V1/301—Analysis for determining seismic cross-sections or geostructures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
    • G01V1/30—Analysis
    • G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging

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  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention relates to a stratum pinch-out line prediction method based on geological-seismic combination, which comprises the following steps of: collecting data; selecting lithology-electrical property mark layers according to the logging electrical property curve and the rock core, establishing lithology-electrical property relation, and determining development characteristics and interface identification marks; establishing a regional well connecting section, defining a stratum spreading rule of an interval, and constructing a stratum transverse change geological mode; drawing a stratum pinch-out trend line of the section based on the three-dimensional earthquake work area and the combined area well-connection section; adopting a stratum thickness method to refine the position of the pinch-out line and clearly define the geological characteristics of the pinch-out line of the stratum; calculating the included angle of the pinch-out trend line at the pinch-out point by using the thickness of the single well stratum and the horizontal distance between wells; calculating and determining the position of the pinch-out line by an included angle extrapolation method; identifying and finely describing the pinch points by adopting an earthquake phase rotation processing method; based on the determined pinch-out line position, comprehensive prediction is carried out by combining the analysis results, and the spreading range of stratum pinch-out lines is defined.

Description

Stratum pinch-out line prediction method based on geological-seismic combination
Technical Field
The invention belongs to the technical field of petroleum exploration and development, and particularly relates to a stratum pinch-out line prediction method based on geological-seismic combination. In particular to the identification and prediction of the deep carbonate pinch-out line, and has important guiding significance for petroleum and gas exploration and exploitation.
Background
In recent years, a set of construction gas reservoirs and construction-stratum gas reservoirs with certain reserve size are discovered in succession in the hot spot and key field of natural gas exploration in the Sichuan sea phase, a great breakthrough of the natural gas exploration in the tidal flat-phase carbonate rock of the Sichuan Lei Kou slope set is obtained, and the fact that construction-stratum trap can effectively form reservoirs is proved, so that the accurate identification and depiction of stratum pinch-off lines of the gas reservoirs are particularly important.
The structure-stratum gas reservoir often has the characteristics of large burial depth of a target layer, rapid lithology combination change and uncertain thickness change trend, and is influenced by the adverse factors of low main frequency of seismic data, less drilling data and the like, so that the identification difficulty of stratum pinch-out lines is high.
In particular, the deep carbonate rock stratum structure with the burial depth of more than 4500 meters has the problems that the acquisition of the seismic data is difficult due to the combined change characteristics of the burial depth and lithology, and the analysis is difficult even if the seismic data is acquired.
In addition, unlike clastic reservoirs, the development of carbonate reservoirs is not limited by depth, deep carbonates lack preset judgment attributes, and there is no necessary correspondence between reservoir properties and depth, and reservoir properties cannot be analyzed through deep carbonate depth correlation.
The existing identification methods of the pinch-out lines, such as a spectrum analysis method, a forward modeling method and the like, cannot effectively identify the pinch-out lines of the deep carbonate strata. The accurate identification of the pinch-out line is an important foundation for exploration deployment and evaluation of the formation trap gas reservoir, so that a geological-seismic combined pinch-out line comprehensive identification method is very necessary to be established, and the accuracy of the formation trap gas reservoir identification is further improved.
Disclosure of Invention
The invention aims at: aiming at the defect that the prior art lacks a prediction method capable of effectively identifying the deep carbonate stratum pinch-out line, the method for identifying and predicting the stratum pinch-out line based on geological-seismic combination is provided, and the method can be suitable for identifying and predicting the deep carbonate stratum pinch-out line.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the stratum pinch-out line prediction method based on geological-seismic combination comprises the following steps:
s1, collecting geological background, drilling and logging, core, open-air outcrop section and seismic data.
S2, selecting a lithology-electrical property mark layer according to the logging electrical property curve and the rock core, and establishing lithology-electrical property relation by adopting a lithology-logging curve comparison method; summarizing the development characteristics and interface identification marks of the layer sequence on the rock core and the logging curve.
S3, based on a study area drilling and logging work area, an area well connection section is established according to a geological background of the study area and a field outcrop section, a spreading rule of stratum of an interval in the transverse direction is defined, and a stratum transverse change geological mode is established.
S4, drawing a stratum pinch trend line of the section based on the three-dimensional earthquake work area and the combined area well connection section; and the stratum distribution range is quantitatively predicted by adopting stratum thickness, and the known distance between the well drilling and the tip vanishing point and the seismic profile characteristics are combined to further refine the position of the pinch-out line of the research area and determine the geological characteristics of the pinch-out line of the stratum.
S5, calculating the included angle theta of the pinch-out trend line at the pinch-out point by using the thickness of the single well stratum and the horizontal distance between wells n Obtaining the average value of the included angles of the pinch lines
And S6, selecting drilled positions of adjacent pinch-out lines, determining the bottom boundary depth of a target layer, and determining the positions of the pinch-out lines according to the pinch-out line angle calculation through a pinch-out line angle extrapolation method.
S7, selecting a piece of three-dimensional seismic data, and identifying and finely describing the pinch-out points of the stratum on the instantaneous phase section of the earthquake by adopting an earthquake phase rotation processing method.
S8, based on the determined pinch-out line position, combining with the geological mode and geological knowledge of the stratum transverse change, comprehensively predicting the stratum pinch-out line by adopting a geological-seismic combination technical means according to analysis results of a stratum thickness method, a pinch-out line angle extrapolation method and a seismic phase rotation processing method, and determining the spreading range of the stratum pinch-out line.
The method for predicting the pinch-out line can be used for preparing and identifying the pinch-out line, combining various data materials, constructing a transverse change geological mode through a spectrum analysis method, a layer leveling technology, a pinch-out line clamping angle extrapolation method and a seismic phase attribute method, and clearly identifying and finely describing the pinch-out line of a stratum. The method improves the formation research precision, has positive guiding significance for petroleum and natural gas exploration and development, can avoid exploration and exploitation problems caused by inaccurate identification of the traditional pinch-out lines, saves petroleum and natural gas development cost, and improves development efficiency. The steps in the prediction method of the present invention are not limited to absolute steps, and those skilled in the art may adjust the order of steps according to the implementation of the relevant steps in the prediction method. The data may be collected according to the requirement of the subsequent step when the data is collected in step S1, so long as the data requirement of the corresponding prediction analysis step is satisfied, and the data collected in step S1 is only for facilitating understanding of what data is required to be used in the prediction method of the present invention, and is not an absolute limitation.
The nominal sequence number of each step in the stratum pinch-out line prediction method is only convenient for describing the content of the pinch-out line prediction method, and does not form absolute implementation sequence limitation. For example, S3 is a mode for constructing a horizontal change address of a stratum and S4-S7 can be mutually processed in parallel for identifying and describing the pinch-out line, so that the implementation sequence limitation is not formed. The person skilled in the art can freely adjust the implementation time of each step according to the research requirement, wait for the dependent step to be implemented in advance if step dependency exists, and freely implement parallel if no dependency exists.
Further, in S1, data is collected according to the study range, and the study object attribute is determined. And the data is collected for rapid summarization, so that the object attribute is accurately researched, and the research efficiency is improved.
Further, in S1, geological background, drilling and logging, core, open-air outcrop section and seismic data are collected, combing and checking are carried out according to well positions and layers, and a drilling and logging work area and a three-dimensional seismic work area of a research area are respectively established according to data attribute characteristics.
Further, in S2, after establishing lithology-electrical relation, analyzing rock structure characteristics and deposit indication meaning of the rock core, and determining lithology combination types of four-level sequence, summarizing development characteristics and interface identification marks of the four-level sequence of different types on the rock core and the logging curve.
Further, in S3, based on the well logging area of the research area, an area well-connecting section is established according to the geological background of the research area and the open-air outcrop section, and by combining with the identification mark of the high-frequency sequence, the four-level sequence is subjected to transverse comparison analysis by adopting a spectrum analysis method, the distribution rule of the sequence stratum in the transverse direction is clarified, the interface of the sequence stratum and the like is determined, and the stratum transverse change geological mode is further constructed.
Preferably, in S3, the geological background of the investigation region includes structure, lithology, formation age, etc.
Further, in S4, based on the three-dimensional seismic working area and combined with the area well-connecting section, the synthetic record calibration of the existing well is utilized, the middle-intensity peak seismic reflection characteristic of the bottom boundary is used as a mark, the horizon tracking interpretation is performed, the stratum bottom boundary of the adjacent well position is used as a base point, the stratum thickness change is used as a basis, the section stratum pinch-out trend line is drawn, the stratum thickness legal prediction stratum distribution range is adopted, the single well stratum bottom boundary vertical depth and the inter-well horizontal distance are determined, the known well drilling distance from the tip vanishing point and the seismic section characteristic are combined, the pinch-out line position of the research area is further refined, and the geological characteristics of the stratum pinch-out line are defined.
Further, in S5, according to the stratum pinch-out trend line and the geological features of the stratum pinch-out line, a stratum leveling technology is selected, and the included angle theta of the pinch-out trend line at the pinch-out point is calculated by utilizing the thickness of the single-well stratum and the horizontal distance between wells n Obtaining the average value of the included angles of the pinch lines
Preferably, the angle theta of the pinch-out trend line at the pinch-out point is calculated by using the thickness of the single well stratum and the horizontal distance between wells and selecting an inverse trigonometric function formula n Obtaining the average value of the pinch-out line included angles by using an average formulaAnd determining the included angle as a standard value of the included angle of the area pinch-out line.
Further, the inverse trigonometric function formula is shown in fig. 1:
wherein θ n Is an included angle of the pinch-out line;
x n is the horizontal distance between adjacent well sites;
|D n the I is the absolute value of the formation thickness difference of adjacent well sites;
further, the average formula is shown in formula 2:
wherein, the liquid crystal display device comprises a liquid crystal display device,the average value of the pinch-out clamp angles is the average value;
θ n is an included angle of the pinch-out line;
n is the number of pinch-out angle sums.
Further, in S6, the drilled well position adjacent to the pinch-out line is selected, the bottom boundary depth of the target layer is determined, the pinch-out line angle extrapolation is selected, and the position of the pinch-out line is quantitatively determined by utilizing a trigonometric function formula.
Preferably, the trigonometric function formula is shown in formula 3:
wherein x is the horizontal distance between adjacent well locations;
d is the bottom boundary depth of the drilling purpose layer;
is the average value of the pinch-out clamp angles.
Further, in S7, processing data by using a frequency expansion processing method based on a two-dimensional seismic section interpreted by the horizon, and analyzing the development characteristics of the pinch-out line on the transverse section;
and taking the three-dimensional seismic data as a datum line, selecting a connecting piece, identifying and finely describing the pinch-out points of the stratum on the instantaneous phase section of the earthquake by adopting a 90-degree phase rotation processing method, and carrying out mutual verification and correction by combining the quantitatively recovered pinch-out line positions.
Further, in S8, based on the determined position of the pinch-out line, in combination with the geological model and geological knowledge of the lateral variation of the stratum, according to the analysis results of the stratum thickness method, the quantitative extrapolation of the included angle of the pinch-out line and the seismic phase attribute method, a geological-seismic combination technical means is adopted to comprehensively predict the pinch-out line of the stratum, so as to further define the spreading range of the pinch-out line of the stratum.
The stratum pinch-out line prediction method based on geological-seismic combination can effectively and accurately identify stratum pinch-out lines, and can accurately divide stratum relations by selecting lithology-electric property mark layers, so that coring data and logging curves are accurately corresponding, limited coring data are fully utilized, and incorrect matching of the coring data is avoided. After the rock core and the logging electrical curves are accurately corresponding, the overall recovery of the change characteristics of the coring well is realized, the logging curve characteristics of the sea-in and sea-out are effectively divided, and continuous analysis and research are realized. Furthermore, a well connection profile is established to realize the side-by-side visualization of well groups, so that stratum comparison is facilitated, and the connectivity of oil reservoirs is intuitively analyzed. On the basis of the visual connected well section, the transverse comparison analysis is carried out by combining the identification marks of the high-frequency sequence, and the determination of the transverse spreading rule of the line-of-sight sequence stratum is accurate.
Furthermore, the invention also provides application of the stratum pinch-out line prediction method.
The stratum pinch-out line prediction method is applied to the carbonate stratum pinch-out line prediction.
The stratum pinch-out line prediction method can be suitable for carbonate rock stratum structures, can overcome the problem of difficulty in predicting and analyzing deep carbonate rock stratum, and improves the research and analysis precision of carbonate rock.
Preferably, the carbonate rock is deep carbonate rock. The carbonate stratum pinch-out line prediction method can be suitable for deep carbonate stratum structures, and can overcome the problem of difficulty in deep stratum prediction analysis. Preferably, the carbonate is a deep carbonate formation of more than 4500 meters.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the stratum pinch-out line prediction method can effectively identify the deep carbonate stratum pinch-out line, provides powerful support for research of exploration deployment and evaluation of formation trap gas reservoirs, improves exploration knowledge, reduces exploration risks, and is simple to operate, high in accuracy and convenient to popularize and apply. And particularly, the identification and prediction accuracy of the deep carbonate pinch-out line is high.
2. The method is based on multi-type data of rock, well logging, earthquake and field outcrop section, establishes lithology-electrical relation by using a lithology-well logging curve comparison method, determines four-level sequence lithology combination type, adopts a spectrum analysis method, a layer leveling technology, a tip-out clamp angle extrapolation method and a seismic phase attribute method, constructs a stratum transverse change geological mode, determines geological characteristics of stratum tip-out lines, realizes identification and fine depiction of the tip-out lines, and provides powerful support for research of exploration deployment and evaluation of structure-stratum trap gas reservoir.
Drawings
FIG. 1 is a flow chart showing the steps of the method for predicting the pinch-out line of the stratum.
Fig. 2 is a section of a zone well connection.
Fig. 3 is a plot thickness method identifying a ramp belt pinch-out line.
Fig. 4 is a schematic diagram of the principle of calculating the quantitative identification of the point vanishing point of the included angle of the pinch-out line.
Fig. 5 shows the distribution range of the pinch-out lines predicted by the seismic phase profile method.
Fig. 6 shows the prediction results before and after the distribution range of the pinch-out line.
Detailed Description
In order to better explain the technical scheme of the invention, the scheme of the invention is described below with reference to specific cases and drawings. The following embodiments should not be considered as limiting the invention, and all solutions according to the inventive concept are within the scope of protection of the invention.
Example 1
The following takes the identification and prediction study of the stratum pinch-out line in a certain area as an example, and the implementation process of the comprehensive prediction method of the pinch-out line is described in detail. As shown in fig. 1, the step flow diagram of the method for predicting the pinch-out line is shown, and the embodiment takes carbonate stratum pinch-out line recognition as an example, and is applicable to other types of stratum pinch-out line recognition applications. Specifically, the stratum pinch-out line prediction method based on geological-seismic combination comprises the following steps.
S1, collecting geological background, drilling and logging, rock core, open-air outcrop section and seismic data, carding and checking according to well positions and layers, and respectively establishing a drilling and logging work area and a three-dimensional seismic work area of a research area according to data attribute characteristics.
S2, selecting a lithology-electrical property mark layer according to the logging electrical property curve and the rock core, and establishing lithology-electrical property relation by adopting a lithology-logging curve comparison method; summarizing the development characteristics and interface identification marks of the layer sequence on the rock core and the logging curve.
S3, based on a well logging area of a research area, an area well connection section (figure 2) is established according to geological background (structure, lithology, formation age and the like) and field outcrop section of the research area, a four-level sequence is subjected to transverse comparison analysis by adopting a spectrum analysis method in combination with identification marks of high-frequency sequence, the distribution rule of sequence strata in the transverse direction is clarified, the interface of sequence strata and the like is determined, and then a stratum transverse change geological mode is constructed.
The high frequency sequence refers to a formation recording sequence formed by four or more loops as a function of effective accommodation space. The four and five-level sequences are referred to as sub-and small sequences, respectively, and represent the effects of superposition between long and short periods at sea level, and the effects of formation on the Milanke wiki gyrations, respectively. Thus, accurate demarcations are possible for sea going and sea going, wherein the sub-layer sequence approximately corresponds to the deposition system domain, the stacking relationship inside which is of 3 types: (1) the accumulation-withdrawal type, (2) the accumulation-withdrawal-addition type and (3) the accumulation-withdrawal type.
The small layer sequence is a basic unit for high-frequency layer sequence research, and is: is a set of relatively integrated layers or layers of layers which are related to each other and are bounded by a flooding surface or a contrasting interface thereof, and appear at special positions in the layer sequence lattice. The small sequences form sub-sequences of different properties by stacking these 3 patterns. The upper and lower parts of the small sequence can be matched with the sequence interface, and can also be the interface of a system domain.
S4, based on a three-dimensional earthquake work area and combined with an area well connecting section, the composite record calibration of the existing well is utilized, the middle-intensity peak earthquake reflection characteristic of the bottom boundary is used as a mark, horizon tracking interpretation is carried out, the stratum bottom boundary of the adjacent well position is used as a base point, stratum thickness change is used as a basis, a section stratum pinch-out trend line is drawn, stratum thickness legal prediction stratum distribution range (figure 3) is adopted, single well stratum bottom boundary vertical depth and inter-well horizontal distance are determined, the known well drilling distance tip vanishing point distance and earthquake section characteristics are combined, the pinch-out line position of the research area is further refined, and the geological characteristics of stratum pinch-out line are defined.
S5, according to stratum pinch-out trend lines and by combining with geological features of the stratum pinch-out lines, a stratum leveling technology is selected, the thickness of a single well stratum and the horizontal distance between wells are utilized, an inverse trigonometric function formula shown in the formula 1 is selected, and the included angle theta of the pinch-out trend lines at pinch-out points is calculated n Obtaining the average value of the included angles of the pinch lines by using an average formula shown in the formula 2And determining the included angle as a standard value of the included angle of the area pinch-out line.
Wherein θ n Is an included angle of the pinch-out line;
x n is the horizontal distance between adjacent well sites;
|D n the I is the absolute value of the formation thickness difference of adjacent well sites;
wherein, the liquid crystal display device comprises a liquid crystal display device,the average value of the pinch-out clamp angles is the average value;
θ n is an included angle of the pinch-out line;
n is the number of pinch-out angle sums.
S6, selecting drilled positions of adjacent pinch-out lines, determining the bottom boundary depth of a target layer, selecting pinch-out line clamp angle extrapolation (shown in figure 4), and quantitatively determining the positions of the pinch-out lines by using a trigonometric function formula shown in formula 3. Wherein, the drilled well position adjacent to the pinch-out line refers to the pinch-out line position determined according to analysis, and the well position close to the pinch-out line is searched. Drilling sites with straight line distances adjacent to the pinch-out line within 20km-30km can be generally selected. Under the condition of gentle variation of the stratum deposition thickness, the accuracy of determining the pinch-out line by the included angle extrapolation method is good. If the formation deposit thickness varies drastically, the accuracy of the angle extrapolation decreases.
Wherein x is the horizontal distance between adjacent well locations;
d is the bottom boundary depth of the drilling purpose layer;
is the average value of the pinch-out clamp angles.
S7, processing data by using a frequency expansion processing method based on the two-dimensional seismic section of horizon interpretation, and analyzing the development characteristics of the pinch-out line on the transverse section;
based on the reference line, selecting a piece of three-dimensional seismic data, adopting a 90-degree phase rotation processing method to identify and finely delineate the pinch-out points of the sea stratum on the instantaneous phase section of the seismic, and combining the quantitatively recovered pinch-out line positions to perform mutual verification and correction. The seismic phase rotation method is used for identifying and combining with the calculation and analysis of the angle of the pinch-out line, so that the accuracy and the reliability of the analysis are remarkably improved, because the traditional analysis assumes that the stratum is parallel, continuous and waiting, the actual sedimentary stratum has a plurality of influencing factors, particularly the stratum such as basin, bench and the like spans more, the traditional analysis assumption is not suitable, and the accuracy of the pinch-out line identification can be effectively improved by using the seismic phase rotation processing method for fine characterization.
S8, based on the determined pinch-out line position, combining with the geological mode and geological knowledge of the stratum transverse change, comprehensively predicting the stratum pinch-out line by adopting a geological-seismic combination technical means according to analysis results of a stratum thickness method, a pinch-out line included angle quantitative extrapolation method and a seismic phase attribute method (figure 6), and further determining the spreading range of the carbonate stratum pinch-out line.
The simple earthquake identification pinch-out line method can be used for better identification only with the thickness of more than 60m, and has poor identification effect when the stratum thickness fluctuation of complex environments such as basins, terraces and the like is more. The method for predicting the fusion analysis of various data can achieve higher precision and can better identify the pinch-out line with severe thickness variation.

Claims (10)

1. The stratum pinch-out line prediction method based on geological-seismic combination is characterized by comprising the following steps of:
s1, collecting geological background, drilling and logging, core, open-air outcrop section and seismic data;
s2, selecting a lithology-electrical property mark layer according to the logging electrical property curve and the rock core, and establishing lithology-electrical property relation by adopting a lithology-logging curve comparison method; summarizing development characteristics and interface identification marks of the sequence on the rock core and the logging curve;
s3, based on a study area drilling and logging work area, establishing an area well-connecting section according to a geological background of the study area and an open-air outcrop section, defining a spreading rule of a stratum of an interval in the transverse direction, and constructing a stratum transverse change geological mode;
s4, drawing a stratum pinch trend line of the section based on the three-dimensional earthquake work area and the combined area well connection section; adopting stratum thickness to quantitatively predict stratum distribution range, combining known well drilling distance from point vanishing point and seismic profile characteristics, further refining the position of the pinch-out line of the research area, and determining geological characteristics of stratum pinch-out line;
s5, calculating the included angle theta of the pinch-out trend line at the pinch-out point by using the thickness of the single well stratum and the horizontal distance between wells n Obtaining the average value of the included angles of the pinch lines；
S6, selecting drilled positions of adjacent pinch-out lines, determining the bottom boundary depth of a target layer, and determining the positions of the pinch-out lines according to pinch-out line angle calculation through pinch-out line angle extrapolation;
s7, selecting a piece of three-dimensional seismic data, and identifying and finely describing the pinch-out points of the stratum on the instantaneous phase section of the earthquake by adopting an earthquake phase rotation processing method;
s8, based on the determined pinch-out line position, combining with the geological mode and geological knowledge of the stratum transverse change, comprehensively predicting the stratum pinch-out line by adopting a geological-seismic combination technical means according to analysis results of a stratum thickness method, a pinch-out line angle extrapolation method and a seismic phase rotation processing method, and determining the spreading range of the stratum pinch-out line.
2. The geological-seismic combination-based stratigraphic pinch-out line prediction method of claim 1, wherein in S1, the study object attributes are determined based on the collection of data from the study area.
3. The geological-seismic combination-based stratum pinch-out line prediction method according to claim 1, wherein in the step S2, after lithology-electrical relation is established, rock structure characteristics and deposit indication significance of a rock core are analyzed, four-level sequence lithology combination types are determined, and development characteristics and interface identification marks of different types of four-level sequence on the rock core and a logging curve are summarized.
4. The geological-seismic combination-based stratum pinch-out line prediction method of claim 1, wherein in the S3, based on a study area drilling and logging area, an area well connection section is established according to a study area geological background and a field outcrop section, a four-level layer sequence is subjected to transverse comparison analysis by adopting a spectrum analysis method in combination with a high-frequency layer sequence identification mark, the distribution rule of a layer sequence stratum in the transverse direction is clarified, the layer sequence stratum isochronous interface is determined, and then a stratum transverse change geological mode is constructed.
5. The geological-seismic combination-based stratum pinch-out line prediction method of claim 1, wherein in S4, based on a three-dimensional seismic work area and a combined area well connection section, the method is characterized in that the synthesized record calibration of the existing well is utilized, the middle-strong peak seismic reflection characteristics of the bottom boundary are used as marks, horizon tracking and interpretation are carried out, the stratum bottom boundary of the adjacent well positions is used as a base point, stratum thickness changes are used as the basis, a stratum pinch-out trend line of the section is drawn, the stratum distribution range is predicted quantitatively by the stratum thickness, the single well stratum bottom boundary vertical depth and the inter-well horizontal distance are determined, the pinch-out line position of a research area is further refined by combining the known well distance from the tip pinch-out point and the seismic section characteristics, and the geological characteristics of the stratum pinch-out line are defined.
6. The geological-seismic combination-based stratum pinch-out line prediction method according to claim 1, wherein in S5, according to stratum pinch-out trend lines, stratum pinch-out line geological characteristics are combined, a stratum flattening technology is selected, and an included angle theta of the pinch-out trend lines at pinch-out points is calculated by using single well stratum thickness and inter-well horizontal distance and an inverse trigonometric function formula n Obtaining the average value of the pinch-out line included angles by using an average formulaAnd determines it as a standard value of the area pinch-out line angle.
7. The geological-seismic combination-based stratum pinch-out line prediction method of claim 1, wherein in S6, the drilled positions of adjacent pinch-out lines are selected, the bottom boundary depth of a target layer is determined, a pinch-out line angle extrapolation method is selected, and the positions of the pinch-out lines are quantitatively determined by utilizing a trigonometric function formula.
8. The geological-seismic combination-based stratum pinch-out line prediction method according to claim 1, wherein in the step S7, a two-dimensional seismic section based on horizon interpretation is adopted, data are processed by using a frequency expansion processing method, and development characteristics of the pinch-out line on a transverse section are analyzed; and taking the three-dimensional seismic data as a datum line, selecting a connecting piece, identifying and finely describing the pinch-out points of the stratum on the instantaneous phase section of the earthquake by adopting a 90-degree phase rotation processing method, and carrying out mutual verification and correction by combining the quantitatively recovered pinch-out line positions.
9. The method for predicting the stratum pinch-out line based on geological-seismic combination according to claim 1, wherein in the step S8, based on the determined pinch-out line position, the stratum transverse change geological mode and geological knowledge are combined, and according to analysis results of a stratum thickness method, a pinch-out line included angle quantitative extrapolation method and a seismic phase attribute method, comprehensive prediction is carried out on the stratum pinch-out line by adopting a geological-seismic combination technical means, so that the spread range of the stratum pinch-out line is further defined.
10. The use of a geological-seismic combination-based formation pinch-out line prediction method according to claim 1 in carbonate formation pinch-out line prediction.
CN202310734691.7A 2023-06-20 2023-06-20 Stratum pinch-out line prediction method based on geological-seismic combination Pending CN116879945A (en)

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