四川盆地西北部栖霞组天然气差异成藏过程

doi:10.11743/ogg20200215

Abstract

Abstract:

A great breakthrough has been made lately for natural gas exploration of the Middle Permian Qixia Formation, Northwestern Sichuan Basin, revealing a typical and unique case of differential hydrocarbon accumulation among different structural zones of the fold-thrust belt-basin system.Based on the analysis of geochemical characteristics of inclusions and geological conditions, we conducted the investigation of differential accumulation process, being of referential meaning to areas of similar geological setting, and of instructional significance to further exploration deployment in the study area.The results show that the Qixia Formation reservoirs in the fold-thrust belt represented by Kuangshanliang and Hewanchang areas are filled with plenty of bitumens and the quartz cements precipitated from acidic fluid following two-stage hydrocarbon charging and one-stage damage, leading to poor gas storage potential.In contrast, the reservoirs in the frontal zone of fold-thrust belt typically shown by Shuangyushi area and in the forebulge zone represented by Jiulongshan area, are filled with limited bitumen and quartz, but massive calcite cements precipitated from alkaline fluids.The former underwent two stages of hydrocarbon charging and one stage of hydrocarbon adjustment, while the latter only went through one-stage hydrocarbon charging, resulting in relatively good gas storage potential.Stable preservation is a critical factor controlling large gas accumulation formation.The underdevelopment of deeply-rooted large faults resulted in limited hydrocarbon charging from the deep Lower Cambrian source rocks under the impact of week compression stress in the frontal zone of fold-thrust belt and forebulge zone.However, the Middle Permian source rocks of sapropelic-humic types are favorable for the formation of self-sourced indigenous play.The stable tectonic setting is conducive to reservoir preservation.In all, the deep-ultra deep hydrocarbon exploration in sags of basin-mountain junction belts is worthy of more attention.

Key words: hydrocarbon accumulation, inclusion, Middle Permian, foreland basin, fold-thrust belt-basin system, Longmenshan

CLC Number:

TE122.1

Bing Luo, Long Wen, Ya Zhang, Chen Xie, Jian Cao, Di Xiao, Guohui Gao, Xiucheng Tan. Differential gas accumulation process of the Middle Permian Qixia Formation, Northwestern Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(2): 393-406.

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Differential gas accumulation process of the Middle Permian Qixia Formation, Northwestern Sichuan Basin

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