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Natural fractures in tight gas sandstones: a case study of the Upper Triassic Xujiahe Formation in Xinchang gas field, Western Sichuan Basin, China

Published online by Cambridge University Press:  18 March 2021

Yunzhao Zhang Open the ORCID record for Yunzhao Zhang [Opens in a new window] ,
Lianbo Zeng ,
Wenya Lyu ,
Dongsheng Sun ,
Shuangquan Chen ,
Cong Guan ,
Lei Tang ,
Jinxiong Shi  and
Junhui Zhang
Yunzhao Zhang
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China
Lianbo Zeng*
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China
Wenya Lyu*
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China
Dongsheng Sun
Affiliation:
Petroleum Exploration and Production Research Institute, Sinopec, Beijing, 100083, China
Shuangquan Chen
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China
Cong Guan
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, China College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China
Lei Tang
Affiliation:
College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China Geophysical Exploration Institute, Jiangsu Oilfield, Sinopec, Nanjing, 210046, China
Jinxiong Shi
Affiliation:
School of Geosciences, Yangtze University, Wuhan, 434100, China
Junhui Zhang
Affiliation:
Research Institute of Exploration and Development of Sinopec Southwest Oil and Gas Company, Deyang, 618000, China
*
Authors for correspondence: Lianbo Zeng, Email: [email protected]; Wenya Lyu, Email: [email protected]
Authors for correspondence: Lianbo Zeng, Email: [email protected]; Wenya Lyu, Email: [email protected]
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Abstract

The Upper Triassic Xujiahe Formation is a typical tight gas reservoir in which natural fractures determine the migration, accumulation and production capacity of tight gas. In this study, we focused on the influences of natural fractures on the tight gas migration and production. We clarified characteristics and attributes (i.e. dips, apertures, filling degree and cross-cutting relationships) of the fractures based on image logging interpretations and core descriptions. Previous studies of electron spin resonance, carbon and oxygen isotopes, homogenization temperature of fluid inclusions analysis and basin simulation were considered. This study also analysed the fracture sequences, source of fracture fillings, diagenetic sequences and tight gas enrichment stages. We obtained insight into the relationship between fracture evolution and hydrocarbon charging, particularly the effect of the apertures and intensity of natural fractures on tight gas production. We reveal that the bedding fractures are short horizontal migration channels of tight gas. The tectonic fractures with middle, high and nearly vertical angles are beneficial to tight gas vertical migration. The apertures of fractures are controlled by the direction of maximum principal stress and fracture angle. The initial gas production of the vertical wells presents a positive correlation with the fracture abundance, and the intensity and aperture of fractures are the fundamental factors that determine the tight gas production. With these findings, this study is expected to guide the future exploration and development of tight gas with similar geological backgrounds.

Keywords

Xujiahe Formationtight gas reservoirnatural fracturefracture characteristicsfracture effectivenessproduction capacity
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 9 , September 2021 , pp. 1543 - 1560
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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