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Shear wave velocity estimation method for shale gas stratum

A technology of shear wave velocity and shale gas, applied in the field of oil and gas geological exploration, can solve the problems of lack of reliability of modeling results and shear wave calculation results, and achieve the effects of real and reliable modeling results, high computing efficiency and sufficient theory

Inactive Publication Date: 2017-02-22
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

However, the rock pore shape is not considered in depth, which makes the modeling results and shear wave calculation results unreliable

Method used

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  • Shear wave velocity estimation method for shale gas stratum
  • Shear wave velocity estimation method for shale gas stratum
  • Shear wave velocity estimation method for shale gas stratum

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Embodiment Construction

[0048] The present invention is a shear wave calculation method for shale gas reservoirs based on conventional well logging data. The method is based on the equivalent modulus self-compatibility model (SCA) for petrophysical modeling, fully considering the pore shape and pore flatness , and fluid substitution based on the Gassmann equation. An accurate, reliable, and highly efficient computing method for shear wave calculation of shale gas is provided. The steps are as follows:

[0049] (1) Based on the V-R-H model to calculate the equivalent bulk modulus and shear modulus of the shale framework under multi-mineral mixing, first calculate the equivalent modulus Voigt upper limit M of N components v and Reuss lower limit M R

[0050]

[0051] On this basis, calculate the V-R-H average M under multi-mineral mixing VRH

[0052]

[0053] Among them, M in (Formula 1) i Indicates the modulus value of the i-th component among the N components, f i Indicates the content o...

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Abstract

The invention discloses a shear wave velocity estimation method for a shale gas stratum, and the method comprises the steps: carrying out the rock physic modeling based on an equivalent modulus self-compatibility model SCA; fully considering to the shape of a hole and the size of hole oblateness, and carrying out the fluid replacement based on a Gassmann equation. The method improves the accuracy of a prediction result, and an algorithm is high in operation efficiency. The method can be used for the calculation of the shear wave data of a shale gas well in actual production practice, and reduces the solution multiplicity of a calculation result.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas geological exploration, in particular to a method for estimating the shear wave velocity of shale gas formations. Background technique [0002] 1. Conventional shear wave inversion methods for carbonate formations: [0003] With the deepening of rock physics research, many experts and scholars have proposed the technical means of using rock physics models to calculate the velocity of saturated rocks. The petrophysical model considers the pore structure of the rock and is suitable for describing rocks with more complex structures. (1) Xu et al. deduced the relational expression reflecting the pore structure of sandstone and mudstone, and then calculated the rock velocity; (2) Zhang Guangzhi et al. improved the Xu-White model and applied it to carbonate reservoirs; (3) Xiong Xiaojun et al. based on the Xu-White model In order to solve the problem that the elastic modulus of matri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303
Inventor 徐明华吴宗蔚伍翊嘉陈琴
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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