Geological characteristics and gas accumulation pattern of tight gas reservoirs in the Upper Triassic Xujiahe Formation in northeastern Sichuan Basin

doi:10.3969/j.issn.1672-7703.2023.03.010

Abstract

Abstract: The exploration of tight gas in the Upper Triassic Xujiahe Formation in Sichuan Basin has always focused in western, central and northern Sichuan Basin, while that in eastern Sichuan Basin has not been attached emphasis due to its complex structural location in ejective fold structural belt, resulting in a low exploration level. In recent years, new breakthroughs have successively been made in the exploration of tight gas in Xujiahe Formation in northeastern Sichuan Basin, and high-yield commercial gas flows have been tested in two wells, which show tight gas potential in Xujiahe Formation in the syncline area in eastern Sichuan Basin. From the perspective of source rock, reservoir and structural conditions, the geological characteristics of tight gas reservoir in Xujiahe Formation in northeastern Sichuan Basin are analyzed,so as to open a new prelude to the tight gas exploration in eastern Sichuan Basin. The study results show that: (1) The hydrocarbon source of Xujiahe Formation gas reservoir in northeastern Sichuan Basin was mainly supplied by source rocks in the Upper Triassic Xujiahe Formation and the Upper Permian Wujiaping Formation, with high intensity of hydrocarbon generation and characteristics of “hydrocarbon supply by dual sources”, which had the material basis for tight gas accumulation; (2) The matrix pores were underdeveloped in Xujiahe Formation reservoir in northeastern Sichuan Basin, and the “fracture-sand body” served as high-quality reservoir. The large-area sand bodies and quasi-continuous fractures in the fifth member of Xujiahe Formation (Xu 5 member) delivered favorable conditions for the formation of large-scale superior “fracture-sand body” reservoir; (3) The gas reservoir in the fifth member of Xujiahe Formation in northeastern Sichuan Basin is characterized by “hydrocarbon supply by dual sources, two-stage gas accumulation and quasi-continuous distribution”, showing superior conditions for gas accumulation. To sum up, Xujiahe Formation in northeastern Sichuan Basin has the conditions for forming large-area and “quasi-continuous” gas reservoir, which has great exploration potential and is of great significance for promoting the exploration of tight gas in the syncline area in the ejective fold structural belt in eastern Sichuan Basin.

CLC Number:

TE112.1

Zhao Zhengwang, Zhang Hang, Zhang Xiaoli, Zeng Lingping. Geological characteristics and gas accumulation pattern of tight gas reservoirs in the Upper Triassic Xujiahe Formation in northeastern Sichuan Basin[J]. China Petroleum Exploration, 2023, 28(3): 121-131.

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