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Method for calculating abnormal formation pressure

A technology of formation pressure and anomalies, applied in the direction of seismic signal processing, etc., can solve the problem of inability to distinguish low-velocity layers and achieve the effect of improving accuracy

Inactive Publication Date: 2015-06-10
PETROCHINA CO LTD
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Problems solved by technology

Therefore, in the calculation of the pressure of gas-bearing formations such as shale gas, only using the P-wave velocity cannot distinguish whether the low-velocity layer is a gas-bearing layer or an overpressure zone.

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  • Method for calculating abnormal formation pressure
  • Method for calculating abnormal formation pressure
  • Method for calculating abnormal formation pressure

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Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] An embodiment of the present invention provides a method for calculating abnormal formation pressure, and the present invention will be described in detail below with reference to the accompanying drawings.

[0035] figure 1 is a method for calculating abnormal formation pressure provided by the embodiment of the present invention, su...

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Abstract

The invention relates to a method for calculating abnormal formation pressure. The method includes: acquiring bulk modulus by compressional and shear velocity and rock physical features; calculating by the bulk modulus and the strain borne by a rock framework to obtain effective stress; determining formation sections with abnormal pressure. The method has the advantages that formation pressure prediction precision is increased, a high-precision model between formation speed and the effective stress is built by eliminating the influence of gas contained in formation on the formation speed, and the bulk modulus method is developed to predict the formation pressure.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a method for calculating formation pressure using geophysical technology. Background technique [0002] Since Pennebaker published an article discussing the use of seismic data to predict abnormal pressure in 1968, the accuracy of pressure prediction using geophysical techniques has gradually improved. But at present, only the longitudinal wave velocity is used to detect the overpressure zone, and sometimes errors may occur. Because the reduction in P-wave velocity is not unique to the overpressure zone, the P-wave velocity in the gas-bearing layer will also be very low. Therefore, in the calculation of the pressure of gas-bearing formations such as shale gas, only using the P-wave velocity cannot distinguish whether the low-velocity layer is a gas-bearing layer or an overpressure zone. [0003] Therefore, a new method for calculating abnormal formation pressure is urgently ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 雍学善王斌尹路许多年曲永强郭娟娟瞿建华甘仁忠王彦君张寒
Owner PETROCHINA CO LTD
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