Inversion stratum pressure prediction method and system based on pre-stack elastic parameters
A technology of formation pressure coefficient and formation pressure, which is applied in the field of oil and gas geophysical exploration, can solve problems such as difficult to eliminate pressure, experience, and inapplicability, and achieve high-precision results
Inactive Publication Date: 2020-03-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
This type of method has the following problems: ① The theoretical basis of the seismic pressure prediction method is not perfect, and the method is based on the concept of compaction, which is not suitable for non-compaction causes, especially the overpressure prediction caused by other sources; ② The prediction method has limitations The application of all methods is based on assumptions and is empirical
In addition, there are many reasons for the decrease (or inversion) of seismic wave velocity, and it is difficult to eliminate factors other than pressure; ③The estimation accuracy and seismic resolution of seismic velocity are limited
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[0044] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the 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.
[0045] figure 1 A flowchart showing the steps of the method for predicting formation pressure based on inversion of pre-stack elastic parameters according to the present invention.
[0046] In this embodiment, the inversion formation pressure prediction method based on pre-stack elastic parameters according to the present invention may include: Step 101, perform inversion based on pre-stack seismic data to obtain elastic parameters; , calculate the overlying formation pressure and hy...
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The invention discloses an inversion stratum pressure prediction method and system based on pre-stack elastic parameters. The method can comprise the following steps: performing inversion based on pre-stack seismic data to obtain elastic parameters; calculating overlying stratum pressure and hydrostatic pressure based on the surface elevation data of the detection point; and calculating stratum pressure and stratum pressure coefficients according to the elastic parameters, the overlying stratum pressure and the hydrostatic pressure. The invention starts from pre-stack seismic data so that rockelastic parameters are obtained through pre-stack seismic inversion; on the basis of the pressure prediction model, stratum pressure and pressure coefficient pre-drilling prediction is achieved, theinvention is not affected by an abnormal pressure forming mechanism and can better adapt to different types of reservoirs, the precision of elastic parameters obtained through pre-stack seismic inversion is higher than that of speed spectrum data obtained through conventional processing, and the precision of stratum pressure obtained through calculation is correspondingly higher.
Description
technical field [0001] The invention relates to the field of oil and gas geophysical exploration, and more specifically, to a method and system for inversion formation pressure prediction based on pre-stack elastic parameters. Background technique [0002] Abnormal formation pressure is a common phenomenon in oil and gas basins, which is closely related to the generation, migration and accumulation of oil and gas. Studying the change of formation pressure can find out the basic rules such as oil and gas migration direction, enrichment characteristics, oil and gas pressure and lithological change characteristics. Abnormal formation pressure, especially abnormal high pressure, is directly related to the safety of drilling and fracturing, thus related to personal and property safety, and related to the oil and gas exploration process. Predicting abnormal pressure before drilling is of great significance for discovering oil and gas reservoirs, designing reasonable drilling flui...
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Login to View More IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 胡华锋刘婵娟林正良张克非
Owner CHINA PETROLEUM & CHEM CORP