A Method for Calculating the Compressibility Coefficient of the Rock Matrix

doi:10.11885/j.issn.1674-5086.2016.06.01.02

Abstract

Abstract: Establishing the relationship between the physical properties, fluid properties, and elasticity parameters of a reservoir is the basis for reservoir prediction and hydrocarbon detection. When using the Biot-Gassman equations to study the elastic properties of rocks with different fluids, the speed and accuracy of deriving the compressibility coefficient of the rock matrix are critical. Based on reasonable assumptions, the Biot-Gassmann equation was used to derive a calculation method for the rock matrix compressibility coefficient; the method was verified by using dehydrated and saturated and high-and low-frequency experimental data for identical tight sandstone. The results showed that this method is effective and reliable for rocks with identical matrix compressibility coefficients. Due to the influence of the microscopic pore structure and hydrophilic minerals, the derived rock matrix compressibility coefficients display small variations with different frequency and saturation fluids. Therefore, the frequency and pore fluid influence should be considered during the application.

Key words: Gassmann equation, low frequency, rock matrix compressibility coefficient, rock physics, tight sandstone

CLC Number:

TE135

WEI Xian, YIN Hanjun. A Method for Calculating the Compressibility Coefficient of the Rock Matrix[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 78-84.

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