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Method and device for determining formation pressure

A technology of formation pressure and surface, which is applied in the field of petroleum geophysical exploration, can solve the problems of low resolution and insufficient seismic prediction accuracy of formation pressure, and achieve the effect of improving resolution and accuracy

Active Publication Date: 2015-01-07
PETROCHINA CO LTD
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Problems solved by technology

[0006] The current calculation models of seismic formation pressure are all finally attributed to the formula related to the velocity of P-wave, which is likely to cause problems such as insufficient accuracy and low resolution of formation pressure earthquake prediction

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  • Method and device for determining formation pressure
  • Method and device for determining formation pressure
  • Method and device for determining formation pressure

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Embodiment Construction

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0057] The inventors found that the current seismic formation pressure calculation models are all finally attributed to the formula related to the longitudinal wave velocity, which may easily cause problems such as insufficient accuracy and low resolution of formation pressure earthquake prediction, because the current seismic formation pressure calculation model does not consider the relationship between shear wave velocity and For the influence of density, etc., only the P-wave velocity item is involved and the S-wave velocity and density items are discarded. Based ...

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Abstract

The invention discloses a method and device for determining formation pressure. The method includes the steps that amplitude preservation processing is carried out on longitudinal wave PP and converted wave PS seismic data so that superposition data of multiple portions can be obtained, and a longitudinal wave impedance body, a transverse wave impedance body and a density body are obtained in a pre-stack PP and PS joint simultaneous inversion method according to logging information; the longitudinal wave impedance body, the transverse wave impedance body and the density body are converted into depth domains; pressure of overlying strata is calculated according to the density body; effective stress of a framework is calculated according to the longitudinal wave impedance body, the transverse wave impedance body and the density body; the formation pressure is calculated according to the pressure of the overlying strata and the effective stress of the framework. Precision of formation pressure seism prediction can be improved.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a method and a device for determining formation pressure. Background technique [0002] Formation pressure is a very important parameter in oil and gas exploration and development. Formation pressure prediction is a major geological problem faced by oil and gas exploration and development. During the drilling process, accurate formation pressure prediction plays an extremely important role in ensuring drilling safety, improving drilling efficiency and reducing drilling costs. In recent years, it has been found that formation pressure prediction is of great significance to the protection of reservoirs, especially natural gas reservoirs. [0003] For more than 40 years, the petroleum industry has gradually formed a set of basic theories for pre-drilling formation pressure prediction and monitoring, which can be roughly divided into two categories in term...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 窦玉坛赵玉华王大兴刘化清
Owner PETROCHINA CO LTD
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