摘要
尼日尔Trakes斜坡位于Termit盆地东台地南部,紧邻Agadem富油区。前期受二维地震资料品质差等限制,断裂组合样式不清楚,成藏主控因素和勘探方向不明确,勘探一直没有较大突破。针对该问题,部署三维地震,在Trakes斜坡发现了NNW—SSE向、NW—SE向及近S—N向3组断裂。受NW—SE向走滑断裂控制,Trakes斜坡发育6条走滑构造带,控制着6个油气富集带。NW—SE向及近S—N向走滑断裂共同控制白垩系—古近系圈闭分布。南部走滑构造带临近生烃凹陷,构造埋深适中,油气富集,是常规油有利勘探区带。北部走滑构造带埋深浅,部分盖层遭受剥蚀,是稠油有利勘探区。Trakes斜坡南部优选了5个有利油气富集带进行勘探,已完钻探井全部获工业油流,为尼日尔二期产能建设及长期稳产奠定了资源基础。
Trakes Slope in Niger is located in the southern part of the eastern terrace in Termit Basin and borders the oil-enriched Agadem area. The patterns of the fault assemblages were unclear owing to the poor quality of the 2D seismic data in the previous stage. The main controlling factors of accumulations and exploration directions remained unidentified while no breakthrough was made in the exploration area. To settle this problem, the 3D seismic surveys were made in this region. As a result, three fault assemblages of NNW-SSE, NW-SE and nearly S-N were found on Trales Slope. Controlled by the NW-SE strike-slip faults, six strike-slip structural belts developed on Trakes Slope, which controlled six oil and gas abundant zones. The NW-SE strike-slip faults controlled distribution of the Cretaceous-Paleogene traps in common with the nearly S-N strike-slip faults. The southern strike-slip was adjacent to the hydrocarbon-sourcing sag. The structure was appropriate in buried depth and abundant in oil and gas. It was the favorable exploration zone for conventional oil. The northern strikes-slip structural belt was buried shallowly, with part of caprock coming under denudation.It was the favorable exploration zone for heavy oil. A total of five oil and gas enriched zones in the southern part of Trakes Slope were optimized and selected for exploration. All fhe drilled and completed exploration obtained the industrial oil flow, laying the resources foundation for the second-stage productivity construction and maintenance of stable production on a long-term basis in Niger.
作者
王中凡
孙维昭
贺金胜
刘强
Wang Zhongfan;Sun Weizhao;He Jinsheng;Liu Qiang(Research Institute of BGP Inc.,CNPC,Zhuozhou 072750,China)
出处
《石油科技论坛》
2022年第2期113-118,共6页
PETROLEUM SCIENCE AND TECHNOLOGY FORUM
基金
中国石油天然气集团有限公司科研项目“海外油气工程关键技术研究”(编号:2021DJ3400)。
