Genetic sources of natural gas in new exploration strata in the piedmont area of southwestern Tarim Basin

IF 5 3区工程技术 Q2 ENERGY & FUELS

Natural Gas Industry B Pub Date : 2025-10-01 Epub Date: 2025-10-10 DOI:10.1016/j.ngib.2025.09.002

Yu Xiao , Qiang Meng , Xiang Wang , Xiaomin Xie , Cai Chen , Qilin Xiao , Guo Chen , Zhanghu Wang

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Abstract

Despite its significant exploration potential, the origin of natural gas in the tectonically complex southwestern Tarim Basin remains controversial due to multiple potential source rocks. This study identifies the genetic types and sources of natural gas by integrating gas molecular and isotopic compositions with the geochemical characteristics of potential source rocks. The results indicate that the Kekeya gas field mainly contains coal-derived gas sourced from the Permian Pusige Formation, whereas the Akemomu field and the QT-1 well contain highly overmature gas from the Permian Qipan Formation with some mantle-derived He and inorganic CO₂. Furthermore, the oil-associated gas in the FS-8 well originates from Permian sapropelic source rocks, while the KS-6 well contains a mixed, oil-associated gas predominantly sourced from the Jurassic Yangye Formation. These findings reveal a complex gas accumulation scenario with multiple genetic types and sources in the southwestern Tarim Basin, providing critical insights for future exploration.

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塔里木盆地西南山前地区新勘探地层天然气成因

塔里木盆地西南构造复杂，天然气的成因存在诸多潜在烃源岩，勘探潜力巨大。将天然气分子、同位素组成与潜在烃源岩地球化学特征相结合，识别天然气成因类型和气源。结果表明，柯克亚气田主要含二叠系普西格组煤成气，而阿克莫木气田和QT-1井含二叠系七盘组高过熟气，含部分幔源He和无机CO2。此外，FS-8井的伴生气主要来自二叠系腐泥烃源岩，而KS-6井的伴生气主要来自侏罗系阳野组。这些发现揭示了塔里木盆地西南部具有多种成因类型和来源的复杂天然气成藏情景，为今后的勘探提供了重要启示。

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