A Method for Calculating Pore Pressure in Carbonate Formation Based on Rock Compressibility Coefficient

A technology of formation pore pressure and rock compressibility, which is applied in the fields of earthwork drilling, design optimization/simulation, special data processing applications, etc., can solve the problems of inapplicability, reduce the impact, solve the difficulty of pore pressure prediction, theoretical strong effect
CN109577969BActive Publication Date: 2021-10-22CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF GEOSCIENCES (WUHAN)
Publication Date
2021-10-22

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Abstract

The present invention provides a method for calculating the pore pressure of carbonate formations based on the rock compressibility coefficient. According to the theory of rock poroelasticity, by analyzing the constitutive relationship between rock compressibility coefficient, pore pressure and effective stress, combined with Biot-Willis law of effective stress Establish a carbonate rock pore pressure prediction and quantification model that characterizes the relationship between pore pressure and rock compressibility coefficient; then through a large number of rock formation compaction coefficient tests and data simulations, according to the fitting Quantitative relationship, combined with carbonate rock physical simulation data to carry out verification and analysis of pore pressure prediction quantitative model, the measured pore pressure is well correlated with the key parameters in the pore pressure prediction quantitative model. From the perspective of rock physics and based on the rock compressibility coefficient, a quantitative model reflecting the constitutive relationship between pore pressure and rock compressibility coefficient is theoretically established, which reduces the influence of subjective knowledge on pore pressure prediction.
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Description

technical field

[0001] The invention relates to the field of geological exploration, in particular to a method for calculating the pore pressure of carbonate formations based on the rock compressibility coefficient. Background technique

[0002] Prediction of formation pore pressure is of great significance to conventional oil and gas exploration, evaluation of unconventional oil and gas sweet spots, and oil and gas development. More accurate prediction of formation pore pressure is also crucial to drilling safety and cost-effectiveness.

[0003] In the past, the empirical methods that have been widely used and have good results for the prediction of formation pore pressure include: the equivalent depth method using porosity and acoustic logging data, and the Eaton (1972) formula using acoustic and resistivity logging data. Using the Fillippone (1979) formula method of seismic layer velocity, the Eberhart-Phillips model (1989) and the Bowers model (1995) by establishing the ...

Claims

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