Study on natural gas-source correlation and hydrocarbon accumulation of the Lianggaoshan Formation in the east of Sichuan Basin, China

IF 1.3 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2024-09-27 DOI:10.1007/s11631-024-00740-z

Xun Luo, Xuanbo Gao, Long Luo, Jianping Liu, Jia Wang, Huanhuan Zhou, Xin Yang, Xin Yu, Long Chen, Zhepei Gou, Yiting Gu, Shukui Zhu, Xianfeng Tan

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Abstract

Uncertainties about natural gas source and hydrocarbon accumulation seriously restrict oil and gas exploration in the Lianggaoshan Formation (J₂l) in the Eastern Sichuan Basin, which has demonstrated great exploration potential in recent years. This study determines the origin of natural gas and the hydrocarbon accumulation model of J₂l in the Eastern Sichuan Basin. A new sample pretreatment method named gas purge-microsyringe extraction was employed and confirmed to be a practical and effective method for preparing condensate oil and collecting source rock extract samples. The source rocks of J₂l exhibited moderate to good qualities, characterized by high TOC values, dominance of type II₁ and II₂ kerogens, and high thermal maturities. Biomarker and aromatic characteristics revealed that the source rocks of J₂l were deposited in brackish water with weak anoxic conditions. The natural gas in J₂l was an organic thermogenic gas generated from the secondary cracking of crude oil, indicating that this natural gas was mainly derived from the source rocks of J₂l. The condensate oil-source rock correlation further confirmed the accuracy of the gas-source correlation results. Based on burial, thermal and hydrocarbon-generating histories, two hydrocarbon charging periods (141–133 Ma and 119–112 Ma) and four hydrocarbon accumulation periods of J₂l were determined. Combined with structural evolution, depositional histories and reservoir conditions, a simple gas reservoir accumulation model of J₂l was developed, which was identified as a “self-generating and self-storing” gas reservoir.

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四川盆地东部两高山组天然气气源对比与油气成藏研究

川东凉高山组天然气来源和成藏的不确定性严重制约了该地区的油气勘探，该地区近年来显示出巨大的勘探潜力。确定了川东地区j21天然气成因及成藏模式。采用气体吹扫-微注射器萃取的样品前处理方法，是制备凝析油和采集烃源岩萃取样品的一种实用有效的方法。j21烃源岩质量中等至较好，TOC值较高，以II1型和II2型干酪根为主，热成熟度较高。生物标志物和芳烃特征表明，j21烃源岩沉积于弱缺氧条件下的微咸水中。j21天然气为原油二次裂解生成的有机热成因气，表明该天然气主要来源于j21烃源岩。凝析油-烃源岩对比进一步证实了气源对比结果的准确性。根据埋藏史、热史和生烃史，确定了2个充注期（141 ~ 133 Ma和119 ~ 112 Ma）和4个成藏期。结合构造演化、沉积历史和储层条件，建立了j21气藏的简单成藏模式，并将其确定为“自生自储”气藏。

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来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.