Acoustic Anisotropy Correction Based on Clay Mineral Content in Shale Oil Horizontal Wells

doi:10.7657/XJPG20250615

Abstract

Abstract:

Horizontal wells are widely used in the development of shale oil reservoirs. Due to the presence of thin interlayers in and significant anisotropy of the reservoir, there is an obvious difference between the acoustic slowness measured in horizontal wells and that measured in vertical wells, which seriously affects the interpretation accuracy of horizontal wells. In this paper, the four-component rotation technique is applied to process dipole array acoustic data for correcting shear-wave anisotropy. The slow shear-wave slowness obtained by this method is difficult to be accurately extracted due to serious dispersion effect. To solve this problem, a functional relationship between shear-wave anisotropy ratio and clay mineral content is established through analyzing horizontal well logging data of typical shale oil reservoirs in different basins, and a transformation relationship between the anisotropy ratios of compressional wave and shear wave is defined by using the core experimental data of these reservoirs. In practical processing, the anisotropy ratios of compressional- and shear-waves are obtained based on the clay mineral content. By combining the fast compressional-wave and shear-wave slowness values extracted from the acoustic logging data, the measured acoustic anisotropy of horizontal well is corrected. This correction method has been used to the actual horizontal well measurements in different basins, suggesting that the corrected acoustic slowness well agrees with the measured value of adjacent vertical well. The porosity calculated by the corrected acoustic slowness is basically consistent with the porosity calculated from the density logging. The results indicate that the proposed correction method is effective, and the corrected acoustic slowness can be used for calculating reservoir and engineering evaluation parameters for shale oil.

Key words: shale oil, horizontal well, acoustic anisotropy correction, clay mineral content, compressional wave, shear wave

CLC Number:

P631.8

LI Yanghu, WANG Zhenlin, SHAO Huanhuan, CHEN Shanhe, TANG Fukang, LIU Caiguang, WANG Wei, ZHANG Hao. Acoustic Anisotropy Correction Based on Clay Mineral Content in Shale Oil Horizontal Wells[J]. Xinjiang Petroleum Geology, 2025, 46(6): 790-799.

Figures/Tables 11

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