四川盆地源内致密气成藏特征及勘探方向

doi:10.3969/j.issn.1672-7703.2025.03.005

摘要/Abstract

摘要： 随着中国含油气盆地油气勘探程度的不断提高，拓展战略接替领域已经成为油气发展的关键问题。最新勘探突破揭示，四川盆地源内致密气具有超万亿立方米的资源潜力，有望成为新的战略性接替领域。基于大量岩心精细描述、测井解释和地球化学数据分析，探讨了四川盆地源内致密气成因类型及层系展布特征，揭示了其油气成藏富集规律，明确了资源潜力及未来勘探方向。结果表明：（1）四川盆地受多旋回构造演化和海—湖平面频繁波动影响，发育多套优质厚层烃源岩，形成了海相和陆相多类型源内致密气；（2）源内致密气具有两种源储配置样式，一是近源成藏，被烃源岩包裹，封盖条件优越，如筇竹寺组致密气和须五段致密气；二是源储一体、高压封存，如雷三²亚段和茅一段海相泥灰岩致密气；（3）筇竹寺组致密砂岩、雷口坡组海相泥灰岩和须家河组五段致密砂岩3套源内致密气资源潜力合计超过4×10¹²m³，是未来勘探重要领域；其中筇竹寺组致密气最有利区为资阳—蓬莱地区，海相泥灰岩有利区集中在蜀南—川中地区，须五段致密气有利区为蓬莱—金华地区。

关键词: 四川盆地, 源内致密气, 筇竹寺组, 茅一段, 须家河组, 资源潜力

Abstract: With the continuous advancement of hydrocarbon exploration in petroliferous basins across China, expanding strategic replacement areas has become a critical issue for oil and gas development. Recent exploration breakthroughs reveal that in-situ tight gas within source rocks of the Sichuan Basin possesses resource potential exceeding 1×10¹² m³, emerging as a prospective new strategic replacement area. Detailed core descriptions, well log interpretations, and geochemical data analyses are integrated in this study to investigate the genetic types and stratigraphic distribution characteristics of in-situ tight gas in the Sichuan Basin, elucidate its hydrocarbon accumulation patterns, and clarifie resource potential with future exploration directions. Key findings include:① Influenced by multicyclic tectonic evolution and frequent sea-lake level fluctuations, the Sichuan Basin has developed multiple sets of high-quality thick source rocks, forming both marine and terrestrial in-situ tight gas systems.② Two distinct source-reservoir configurations are identified: a) Near-source accumulation enveloped by source rocks with superior sealing conditions (e.g., Qiongzhusi Formation tight gas and Xu5 member tight gas); b) Integrated source-reservoir systems with overpressure preservation (e.g., tight gas in the Lei-32 submember and Mao-1 Member marine marl). ③ Three in-situ tight gas systems demonstrate combined resource potential exceeding 1×10¹² m³: (1) Qiongzhusi Formation tight sandstones (most favorable area: Ziyang-Penglai region); (2)Leikoupo Formation marine marls (primary prospective area: southern-central Sichuan); (3)Xu5 member tight sandstones (key exploration target: Penglai-Jinhua area). These systems represent crucial future exploration frontiers, with particular emphasis on the Ziyang-Penglai region for Qiongzhusi tight gas development.

Key words: Sichuan basin, In-situ tight gas, Qiongzhusi formation, Mao1 member formation, Xu5 member, Resource potential

中图分类号:

TE122.1

谢武仁, 文龙, 汪泽成, 罗冰, 郑马嘉, 马石玉, 陈娅娜, 辛勇光, 杨荣军. 四川盆地源内致密气成藏特征及勘探方向[J]. 中国石油勘探, 2025, 30(3): 62-74.

Xie Wuren, Wen Long, Wang Zecheng, Luo Bing, Zheng Majia, Ma Shiyu, Chen Yana, Xin Yongguang, Yang Rongjun. Reservoir Formation Characteristics and Exploration Strategies of In-situ Tight Gas in the Sichuan Basin[J]. China Petroleum Exploration, 2025, 30(3): 62-74.

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