中国石油勘探 ›› 2025, Vol. 30 ›› Issue (3): 51-64.DOI: 10.3969/j.issn.1672-7703.2025.03.004

• 勘探案例 • 上一篇    下一篇

塔里木盆地库车坳陷万米领域天然气成藏关键条件分析与接替领域优选#br#

张荣虎1,金武弟2,曾庆鲁1,杨宪彰3,余朝丰1,宋兵1,王珂1,李东1   

  1. 1 中国石油杭州地质研究院;2 中国石油油气和新能源公司;3 中国石油塔里木油田公司
  • 出版日期:2025-05-15 发布日期:2025-05-15
  • 作者简介:张荣虎(1976-),男,河南方城人,博士,2013年毕业于中国石油勘探开发研究院,正高级工程师,现主要从事海相及陆相碎屑岩沉积储层、油气成藏研究与区带评价工作。地址:浙江省杭州市西湖区西溪路920号,邮政编码:310023。
  • 基金资助:
    国家自然科学基金企业创新发展联合基金集成项目“环青藏高原盆山体系动力学与天然气富集机理”(U22B6002);中国石油天然气股份有限公司基础性前瞻性科技重大专项“叠合盆地中下组合油气成藏与保持机制研究”(2023ZZ02)。

Analysis of key conditions for gas accumulation and favorable replacement fields in 10000-meter deep formations in Kuqa Depression, Tarim Basin

Zhang Ronghu1,Jin Wudi2,Zeng Qinglu1,Yang Xianzhang3,Yu Chaofeng1,Song Bing1,Wang Ke1, Li Dong1   

  1. 1 PetroChina Hangzhou Research Institute of Geology; 2 PetroChina Oil, Gas & New Energies Company; 3 PetroChina Tarim Oilfield Company
  • Online:2025-05-15 Published:2025-05-15

摘要: 万米深层是库车坳陷源内天然气勘探的重要领域之一,因其资源量大、保存条件好、油气充注近邻而成为潜在的接替领域,但也存在诸如构造圈闭、规模储层和成藏类型等不明确的关键问题。基于深部构造地质结构解剖、生烃潜力评价、储层成岩物理模拟和成藏模式综合研究,开展了万米深层天然气的成藏关键条件分析和领域选区。研究表明:库车坳陷万米深层领域发育受煤系地层及巨厚泥岩、古生界不整合面等三滑脱层控制的大型断背斜、背斜和断块构造,这些构造在克拉苏构造带万米深层集中发育;万米深层领域发育巨厚的三叠系—下侏罗统高—过成熟煤系和湖相泥岩烃源岩,生烃量为(1000~3000)×108m3/km2;大面积广域分布的辫状河三角洲下平原—前缘巨厚砂体和晚期快速深埋、超高温压强构造挤压应力作用下,大规模发育的裂缝—孔隙型储层,在万米深层仍具有5%~10%的孔隙度和1mD以上的渗透率;万米深层领域主要为三叠系—下侏罗统近源/源内的区域性生储盖组合,以构造—岩性致密砂岩气藏为主,优选克拉苏构造带可勘探面积达4200km2,天然气资源量可达1.5×1012m3,其中克深气田之下构造圈闭是有利目标区。该研究成果将为国内万米深层碎屑岩领域天然气勘探奠定基础认识,为库车前陆盆地冲断带克拉—克深之下再找大气田夯实地质理论基础。

关键词: 万米深层天然气, 关键条件, 接替领域, 库车坳陷, 塔里木盆地

Abstract: The 10000-meter deep formation is an important field for intra source rock gas exploration in Kuqa Depression, which is a potential replacement field benefit from its large resource amount, good preservation conditions and near-source hydrocarbon charging. However, there is unclear understanding of structural traps, reservoir scale and oil and gas reservoir types. Based on geological study of deep structures, hydrocarbon generation potential evaluation, physical simulation of reservoir diagenesis and comprehensive analysis of hydrocarbon accumulation mode, the key conditions for gas accumulation in 10000-meter deep formations have been analyzed and favorable replacement fields have been optimally selected. The results show that, controlled by three detachment layers such as coal measure strata, huge thick mudstone, and Paleozoic unconformity, large fault anticlines, anticlines and fault block structures were developed in 10000-meter deep formations in Kuqa Depression, and mostly concentrated in Kelasu thrust belt. The huge thick Triassic–Lower Jurassic highly-over mature coal measures and lacustrine mudstone source rocks were developed in 10000-meter formations, with a hydrocarbon generation capacity of (1000–3000)×108 m3/km2. Jointly controlled by the large-area braided river delta plain–front huge thick sand bodies, rapidly deep burial in the late stage, ultra-high temperature and ultra-high pressure, and intense tectonic compressive stress, the large-scale fractured–porosity type reservoirs still have good physical properties at a depth of 10000 m, with a porosity of 5%–10% and a permeability of higher than 1 mD. The Triassic-Lower Jurassic regional near/intra source rock hydrocarbon accumulation combination was dominant in 10000-meter deep formation, generally forming structural-lithologic tight sandstone gas reservoirs. The Kelasu thrust belt is optimally selected as a strategic exploration zone, with an area of 4200 km2, and gas resources of up to 1.5×1012 m3, and the traps below Keshen Gas Field are favorable targets. The research results provide basic understanding for gas exploration in clastic rocks with a depth of 10000 meters in China, and lay geological theoretical foundation for further discovery of large gas fields below Kela–Keshen in Kuqa foreland basin thrust belt.

Key words: 10000-meter deep gas, key condition, replacement field, Kuqa Depression, Tarim Basin

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