石油学报 ›› 2019, Vol. 40 ›› Issue (11): 1281-1295.DOI: 10.7623/syxb201911001

• 地质勘探 •    下一篇

塔里木盆地寒武系盐下勘探领域的重大突破方向

易士威1, 李明鹏1, 郭绪杰2, 杨帆2, 缪卫东1, 林世国1, 高阳1   

  1. 1. 中国石油勘探开发研究院 北京 100083;
    2. 中国石油勘探与生产公司 北京 100007
  • 收稿日期:2019-02-12 修回日期:2019-08-06 出版日期:2019-11-25 发布日期:2019-12-07
  • 通讯作者: 李明鹏,男,1989年2月生,2012年获中国地质大学(武汉)学士学位,2015年获中国石油大学(华东)硕士学位,现为中国石油勘探开发研究院工程师,主要从事油气地质综合研究及勘探部署工作。Email:limingpeng@petrochina.com.cn
  • 作者简介:易士威,男,1964年1月生,1986年获武汉地质学院学士学位,2006年获成都理工大学博士学位,现为中国石油勘探开发研究院教授级高级工程师,主要从事油气地质综合研究及勘探部署工作。Email:ktb_ysw@petrochina.com.cn
  • 基金资助:

    国家科技重大专项(2016ZX05007-002,2016ZX05007-003)资助。

Breakthrough direction of Cambrian pre-salt exploration fields in Tarim Basin

Yi Shiwei1, Li Mingpeng1, Guo Xujie2, Yang Fan2, Miao Weidong1, Lin Shiguo1, Gao Yang1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. PetroChina Exploration&Production Company, Beijing 100007, China
  • Received:2019-02-12 Revised:2019-08-06 Online:2019-11-25 Published:2019-12-07

摘要:

塔里木盆地寒武系发育大面积膏盐岩盖层,盐下发育大面积优质烃源岩、大面积优质白云岩储层,丰富的油气资源和良好的成藏条件使其成为塔里木盆地天然气勘探的重大战略接替领域。塔里木盆地的寒武系盐下勘探领域在不同地区的生-储-盖空间配置关系、构造稳定性、断裂发育状况和保存条件存在很大不同,这不仅控制了寒武系盐下的成藏及演化,而且决定了气藏能否得以保存,最终决定着寒武系盐下大气藏的有利发育区带和勘探突破方向。塔里木盆地寒武系盐下的生-储-盖配置可划分为生-储-盖叠置、生-储叠置、储-盖叠置3种类型;保存条件可划分为盖层完整持续稳定、盖层完整中期稳定、盖层完整持续活动、缺乏区域盖层持续稳定4种类型;成藏区带可划分为原位持续成藏、原位调整成藏、稳定古隆起多期成藏、活动古隆起晚期成藏4种类型。在生-储-盖叠置、构造演化持续稳定、未受断层破坏的良好保存区,即原位持续成藏区是塔里木盆地寒武系盐下寻找大气区的有利勘探方向,在该有利区带内,肖尔布拉克组的大型孤立白云岩台内滩是大气藏勘探突破的最有利目标。

关键词: 塔里木盆地, 寒武系盐下, 生-储-盖配置, 台内滩, 勘探领域, 突破方向

Abstract:

A large area of gypsum-salt cap rocks are developed in the Cambrian strata of Tarim Basin, as well as a large scale of high-quality pre-salt source rocks and dolostone reservoirs. Depending on abundant hydrocarbon resources and good accumulation conditions, the Cambrian strata have become a successive field with important strategic significance during gas exploration in Tarim Basin. The source-reservoir-cap configuration, structural stability, fault development and preservation condition in Cambrian pre-salt exploration fields are quite different in various areas of Tarim Basin. This not only controls the pre-salt hydrocarbon accumulation and evolution in the Cambrian, but also determines whether the gas reservoirs can be preserved, and eventually points out the favorable areas and breakthrough direction for exploring the Cambrian pre-salt reservoirs. The Cambrian pre-salt source-reservoir-cap configuration can be divided into three superimposition types of source-reservoir-cap, source-reservoir and reservoir-cap. In addition, there are four types of preservation conditions including the continuously stable and intact cap rock, the intact cap rock only stable in the middle stage, the intact and continuously active cap rock, and the lack of regional cap rock with sustainable stability. There are four hydrocarbon accumulation patterns involving in-situ sustainable accumulation, in-situ accumulation after adjustment, multistage accumulation in the stable paleo-uplift, and later accumulation in the active paleo-uplift. The well-preserved area characterized with source-reservoir-cap superimposition, sustained and stable tectonic evolution, and no destroy from faults, i.e., the in-situ sustainable accumulation zone, indicates the favorable prospecting direction in the giant gas area of the Cambrian pre-salt fields. In this area, the isolated intraplatform shoal of Xiaoerbulake Formation is the most favorable target for achieving a breakthrough in giant gas reservoir exploration.

Key words: Tarim Basin, Cambrian pre-salt, source-reservoir-cap assemblage, intraplatform shoal, exploration field, breakthrough direction

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