Method for calculating formation pressure based on petrophysical parameters

A technique of petrophysics and formation pressure, applied in the field of exploration geophysical data processing

Active Publication Date: 2016-04-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

It can be seen that formation pressure is actually a comprehensive performance result of formation rock physics parameters. This raises a question, what are we actually predicting when predicting formation pressure? To obtain more accurate formation pressure prediction results, there are no better way

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  • Method for calculating formation pressure based on petrophysical parameters
  • Method for calculating formation pressure based on petrophysical parameters
  • Method for calculating formation pressure based on petrophysical parameters

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Embodiment Construction

[0072] In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are listed below in conjunction with the accompanying drawings, which are described in detail as follows.

[0073] Such as figure 1 As shown, figure 1 It is a flowchart of the method for calculating formation pressure based on petrophysical parameters of the present invention. In step 101, prepare the required logging data (including the longitudinal wave velocity V of the formation) P , Transverse wave velocity V S , Density ρ and porosity φ logging data. The flow proceeds to step 102.

[0074] In step 102, the bulk modulus K of the saturated rock (wet rock) is calculated from the logging data wet ,Calculate the effective bulk modulus K of mineral (particle) composition according to the V-G-H model ma , Wood model calculates the bulk modulus K of pore fluid f . The process goes to step 103.

[0075] In step 103, ...

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Abstract

The invention discloses a method for calculating formation pressure based on petrophysical parameters, and uses well measurement data of a velocity of a P-wave VP, a velocity of a shear wave VS, a density Rho and a porosity Phi of formation. The method comprises the following steps: deriving a ratio value between a bulk modulus Kdry of a dry rock and a bulk modulus Kma of a rock matrix material by using a Gassmann equation; calculating an effective bulk modulus Kma of a mineral component according to a V-G-H model, calculating a bulk modulus Kf of a pore fluid according to a Wood model to calculate an effective stress coefficient Alpha and an Skempton coefficient B; and estimating the formation pressure according to an effective stress between the Skempton coefficient B and a porous media, the effective stress coefficient Alpha and the Skempton coefficient B. The method is suitable for a mixed lithology and a single lithology, the formation pressure is estimated without relying on a conventional under compaction theory of a mudstone or a shale, so that the calculated formation pressure is more close to real formation pressure.

Description

Technical field [0001] The invention relates to the technical field of exploration geophysical data processing, in particular to a method for calculating formation pressure based on petrophysical parameters in petrophysical. Background technique [0002] At present, the application of formation pressure (formation pore fluid pressure) prediction is mainly divided into two aspects. The first is to use seismic velocity to predict formation pressure before drilling to serve the drilling engineering. It mainly predicts the abnormal high pressure that may exist in the formation to prevent When a drilling accident occurs, the proportion of drilling mud is generally between the normal pressure of the formation and the pressure of the formation fracture. The second is to use logging data to estimate the formation pressure of the wells that have been drilled, and to further predict the stress, fracture pressure and collapse pressure of the formation in order to fracturing the reservoir an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01V1/50
Inventor 王鸿升贺洋洋王兴谋闫昭岷冯德永宫红波
Owner CHINA PETROLEUM & CHEM CORP
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