叠合裂谷盆地风险勘探案例剖析——以尼日尔Termit 盆地Agadem/Bilma/Tenere区块为例

doi:10.3969/j.issn.1672-7703.2022.06.007

摘要/Abstract

摘要： Esso等多家国际油公司在Termit盆地勘探36年，未获商业开发储量规模而退出。中国石油通过技术评价和商务一体化结合，于2003年进入Termit盆地，制定“分步走”勘探策略，一方面在盆地已有发现的西部进行滚动勘探落实储量，另一方面通过攻关核心地质问题，明确主力含油气层系和勘探方向。研究认为：（1）Termit盆地为发育两期裂谷和两期坳陷的叠合裂谷盆地，且在晚白垩世遭受海侵，与中西非地区其他陆相裂谷盆地有所差异；（2）古近系下部砂泥互层与上部区域性泥岩构成主力储盖组合；（3）不断深化并建立了海陆叠合裂谷油气成藏模式，指导发现了4个亿吨级油田群，勘探获得巨大成功，成为海外自主勘探的又一典型成功案例。启示包括：（1）技术评价和商务一体化运作是尼日尔区块获取的重要原因；（2）陆相裂谷石油地质理论和技术的成功应用是Termit盆地勘探成功的前提；（3）建立Termit盆地成藏模式是勘探获得重大突破的主因。

关键词: 叠合裂谷, 尼日尔, Termit盆地, 风险勘探, 案例分析, 自主勘探

Abstract: Esso and other international companies had conducted exploration in Termit Basin for 36 years and withdrawn since no commercial reserves were discovered. In 2003, CNPC participated in the petroleum exploration in Termit Basin and implemented the exploration strategy of “step-by-step” by integrating the technical evaluation and business operation. On the one hand, the progressive exploration in the western part of the basin with discoveries was conducted to determine the proven reserves, and on the other hand, the main oil-bearing series and exploration orientation were defined by studying on the core geological problems. The results show that: (1) Termit Basin was a superimposed rift basin experienced two stages of rift and two stages of depression and suffered transgression in the Late Cretaceous, showing different characteristics form other continental rift basins in Central and Western Africa; (2) The main reservoir and cap rock assemblage was formed by the interbedded sandstone and mudstone in the Lower Paleogene and the regional mudstone in the Upper Paleogene; (3) The hydrocarbon accumulation mode in marine and continental superimposed rift basin was continuously researched and established, supporting to discover four oilfield groups with reserve level of hundred million tons, which was a typical successful case of overseas independent exploration. The implications include: (1) The integration of technical evaluation and business operation is an important reason for block acquisition in Niger; (2) The application of petroleum geology theory and technology of continental rift basin is the prerequisite for successful exploration in Termit Basin; (3) An appropriate hydrocarbon accumulation mode in Termit Basin is the key factor for achieving the major exploration breakthrough.

中图分类号:

TE122.11

袁圣强, 翟光华, 毛凤军, 肖坤叶, 郑凤云, 何伶, 程顶胜, 李早红, 姜虹. 叠合裂谷盆地风险勘探案例剖析——以尼日尔Termit 盆地Agadem/Bilma/Tenere区块为例[J]. 中国石油勘探, 2022, 27(6): 63-74.

Yuan Shengqiang, Zhai Guanghua, Mao Fengjun, Xiao Kunye, Zheng Fengyun, He Ling, Cheng Dingsheng, Li Zaohong, Jiang Hong. Risk exploration in superimposed rift basin: case studies of Agadem/Bilma/Tenere blocks in Termit Basin, Niger[J]. China Petroleum Exploration, 2022, 27(6): 63-74.

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