Fracture distribution and prediction of weathering crust reservoirs on the top of Leikoupo Formation, Xinchang area, western Sichuan Basin

The Leikoupo Formation in the western Sichuan Basin is an important potential stratum for the increasing of reserves and production. Recently, industrial grade gas flow has been discovered for the first time from weathering crust reservoirs on the top of Leikoupo Formation in the Xinchang area. Diss...

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Published inShi you shi yan di zhi Vol. 44; no. 3; pp. 448 - 455
Main Authors Lan ZHU, Suhua LI, Yang YU, Rong LI, Guoshan SHI, Guoming XU
Format Journal Article
LanguageChinese
Published Editorial Office of Petroleum Geology and Experiment 01.05.2022
Subjects
curvature attribute
fracture
image logging
leikoupo formation
weathering crust
western sichuan basin
xinchang area
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Summary:The Leikoupo Formation in the western Sichuan Basin is an important potential stratum for the increasing of reserves and production. Recently, industrial grade gas flow has been discovered for the first time from weathering crust reservoirs on the top of Leikoupo Formation in the Xinchang area. Dissolution pores as well as fractures are the main storage spaces and seepage channels. Then, how to accurately predict the distribution characteristics of these cracks in weathered crust reservoirs has become a key factor of advance exploration process. Core observation and imaging logging data were applied to clarify the geological characteristics of fracture development. Some seismic prediction methods such as coherence, dip, azimuth and curvature attributes were used to identify the plane distribution characteristics of fracture development zones. Results show that the fractures in weathering crust reservoirs on the top of Leikoupo Formation are mainly in the middle and low angles, and the strikes are NE-SW, NW-SE
ISSN:1001-6112
DOI:10.11781/sysydz202203448