Petrochina Company Limited

Xiangzhi Cheng

Zhonghua Liu

Xia Li

Chao Yuan

Lianteng Song

Jixin Deng

Haitao Zhang

Xiaoming Yang

Song Hu

Hongjun Xu

Cancan Zhou

Chaoliu Li

Changxi Li

Qiangfu Kong

Baoyin Xue

Peiyuan Zhang

A method for obtaining a conversion relationship between dynamic and static elastic parameters includes: Step S, acquiring horizontal cores at different depths of the destination formation; Step S, measuring the dynamic elastic parameters of the horizontal core under different pressures; Step S, measuring the static elastic parameters of the horizontal core under different pressures; Step S, measuring the clay content of the horizontal core; Step Sestablishing a function relationship of the ratio between the dynamic and static elastic parameters with the formation pressure and clay content; and completing the conversion between the dynamic and static elastic parameters. The technical solution provided by the present invention takes full account of the influence of the formation stress and the clay content on the conversion rule of dynamic and static elastic parameters and is of great significance for improving the logging evaluation accuracy of rock mechanical parameters.

Method for obtaining conversion relationship between dynamic and static elastic parameters

The present invention proposes a method and apparatus of determining stiffness coefficients of formation, wherein the method comprising: setting up a relation of stiffness coefficients of formation Cand C, C, Cbased on stiffness coefficients of a formation core sample; computing clay content of formation along depth continuously based on formation logging information; computing the stiffness coefficient of formation Calong depth continuously based on a P-wave velocity and a volume density of the formation; computing the stiffness coefficient of formation Calong depth continuously based on a S-wave velocity and a volume density of the formation; and then computing the stiffness coefficients of formation Cand Calong depth continuously based on the calculations above, the relation of stiffness coefficients of formation Cand C, C, C, and a relation of an anisotropy coefficient of the P-wave of the formation and its clay content or a relation of an anisotropy coefficient of the S-wave of the formation and its clay content. The present invention does not need to calculate stiffness coefficients by using a horizontal S-wave velocity inversed from the extracted stoneley waves, and avoids an extraction process of horizontal S-wave, such that the calculation is simple and effective.

Method and apparatus of determining stiffness coefficients of formation

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Beijing, China

Xiangzhi Cheng