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Stratum pressure pre-drilling prediction method and system based on VSP data

A technology of formation pressure and prediction method, applied in the field of oil and gas geophysical exploration, can solve the problems of limited seismic velocity estimation accuracy and seismic resolution, imperfect theoretical basis of seismic pressure prediction method, and experience, etc.

Pending Publication Date: 2021-04-13
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 experience. 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 seismic velocity Estimation accuracy and seismic resolution are limited

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  • Stratum pressure pre-drilling prediction method and system based on VSP data
  • Stratum pressure pre-drilling prediction method and system based on VSP data
  • Stratum pressure pre-drilling prediction method and system based on VSP data

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Embodiment Construction

[0043] 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.

[0044] figure 1 A flow chart showing the steps of the method for pre-drilling prediction of formation pressure based on VSP data according to the present invention.

[0045] In this embodiment, the method for pre-drilling prediction of formation pressure based on VSP data according to the present invention may include: step 101, calculating the longitudinal wave velocity according to the zero-bias VSP data; step 102, calculating the shear wave velocity according to the longitudinal wa...

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Abstract

The invention discloses a stratum pressure pre-drilling prediction method and system based on VSP data. The method comprises the following steps: calculating a longitudinal wave speed according to zero-offset VSP data; calculating a transverse wave speed according to the longitudinal wave speed; calculating a Lame coefficient and a shear modulus according to the longitudinal wave velocity and the transverse wave velocity; calculating effective stress according to the Lame coefficient, the shear modulus and the Husheng's law; and calculating the formation pressure according to the overlying formation pressure and the effective stress. VSP acquisition is carried out on the completed drilling section, and accurate speed information of the target stratum in front of the drill bit and the possible high-pressure stratum is inversed based on VSP data, so that the pre-drilling pressure prediction accuracy of the target stratum is improved, and the drilling risk is reduced.

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 pre-drilling prediction of formation pressure based on VSP data. 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 fluid density and ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 胡华锋纪永祯林正良杨丽
Owner CHINA PETROLEUM & CHEM CORP