Abnormal formation pressure calculation method

A formation pressure and anomaly technology, applied in seismic signal processing and other directions, can solve the problem of inability to distinguish low-velocity layers, and achieve the effect of improving accuracy

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

Therefore, in identifying 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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Embodiment Construction

[0047] 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.

[0048] 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.

[0049] 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 discloses an abnormal formation pressure calculation method. The method includes: acquiring first effective stress through the relation between Young modulus and longitudinal and transverse wave velocity; acquiring second effective stress through the relation between bulk modulus and the longitudinal and transverse velocity; subjecting the first effective stress and the second effective stress to weighted average to acquire a final effective stress result; according to the final effective stress result, determining abnormal formation pressure sections by the aid of the effective stress theory. With the method, precision in predicting formation pressure is improved, influence of containing gas in the formation on formation velocity is eliminated, a high-precision model is established between the formation velocity and the effective stress, and an elastic modulus weighing method is developed to have the formation pressure predicated.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a method for calculating abnormal formation pressure using geophysical technology to calculate formation pressure. 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 identifying 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 abnorm...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 王斌雍学善潘建国滕团余黄玉尹路许多年曲永强齐雯郭娟娟
Owner PETROCHINA CO LTD
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