Hoffman Warnick LLC
Method and apparatus of determining stiffness coefficients of formation
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 C11 and C33, C44, C66 based 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 C33 along depth continuously based on a P-wave velocity and a volume density of the formation; computing the stiffness coefficient of formation C44 along depth continuously based on a S-wave velocity and a volume density of the formation; and then computing the stiffness coefficients of formation C11 and C66 along depth continuously based on the calculations above, the relation of stiffness coefficients of formation C11 and C33, C44, C66, 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.
PETROCHINA COMPANY LIMITED
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G01V G01V
additional inventional
Xia Qiangfu Chaoliu Zhonghua Lianteng Peiyuan Chao Xiangzhi Cancan Song Hongjun Baoyin Changxi Jixin
Li Kong Li Liu Song Zhang Yuan Cheng Zhou Hu Xu Xue Li Deng