Preliminary Investigation on the Role of Sandstones in Interacting Caprocks of the Huagang Formation in the Xihu Depression

doi:10.11885/j.issn.1674-5086.2016.11.05.01

Abstract

Abstract: Interactions between sandstone and mudstone are present in the developmental characteristics of caprocks of the Huagang Formation in the Xihu Depression, but studies on the role of mudstone-associated sandstone-type caprocks in the sealing of petroleum are relatively scarce. The characteristics of sandstones within interactive sandstone-mudstone caprocks were analyzed using rock cores, microscopic observations, and mercury intrusion porosimetry. The results show that sandstones within the caprock are able to act as an effective seal (caprock). Sandstone-type caprocks are controlled by their sedimentary environment during early periods, and their high argillaceous mineral content led to strong compaction during these periods. The addition of clay mineral transformation and cement development in later periods imbued these rocks with the conditions necessary for the formation of a highly effective caprock. The sedimentary environment of caprocks should be the foundation for studies on the effectiveness of sandstone caprocks in different regions, and diagenetic studies should be performed on the various sandstones present. In addition, experimental analyses should be conducted on different types of sandstone samples to determine the effectiveness of sandstone caprocks.

Key words: Xihu Depression, Huagang Formation, sandstone caprocks, diagenesis, breakthrough pressure

CLC Number:

TE122

ZHAO Hong, QIN Lanzhi, WANG Hui, LI Ning, LI Xuanyue. Preliminary Investigation on the Role of Sandstones in Interacting Caprocks of the Huagang Formation in the Xihu Depression[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 43-51.

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