Fracture identification and evaluation based on multi-pole acoustic logging

被引：0
|
作者：
Che X. [1 ,2 ]
Zhao T. [1 ,2 ]
Qiao W. [1 ,2 ]
Lyu W. [1 ]
Fan J. [3 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[2] Beijing Key Laboratory of Earth Prospecting and Information Technology, China University of Petroleum (Beijing), Beijing
[3] Research Institute of Petroleum Exploration and Development, Changqing Oilfield Branch Company Ltd., PetroChina, Xi'an
来源：
Oil and Gas Geology | 2020年 / 41卷 / 06期
关键词：
Acoustic wave attenuation; Anisotropy; Compressional to shear slowness ratio; Fracture assessment; Multi-pole acoustic logging; Stoneley wave reflection coefficient;
D O I：
10.11743/ogg20200614
中图分类号：
学科分类号：
摘要：
Multi-pole acoustic logging is widely used in oilfields, especially for stratigraphic fracture assessment and analysis. The study briefly introduces the research status-quo of multi-pole acoustic logging in fracture identification both at home and abroad, and briefs on the currently new methods to evaluate fractures with multi-pole acoustic waveform data. Taking the field multi-pole acoustic waveform data of the drilling sector X in the Ordos Basin as a case study, we determine the fracture dip angle by compressional to shear slowness ratio, and the fracture dip angle and its validity by mode wave attenuation in boreholes. Furthermore, the Stoneley wave reflection coefficient is used to characterize the fracture locations. The intensity of fracture development is estimated by the shear wave slowness anisotropy and difference between the fast and slow shear wave spectrums. The fracture strike is assessed by the fast shear azimuth. In addition, the field electrical imaging log data are applied to compare and verify those fracture measurement methods. The advantages for and interference factors to these methods are also summarized. In all, an integration of multiple methods can certainly facilitate us to obtain more fracture parameters, avoiding some multi-solution problems of a single method, and thus enhancing the accuracy and reliability of fracture assessment based on multi-pole acoustic waveform data. © 2020, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：1263 / 1272
页数：9
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