摘要
由于尼日尔三角洲盆地深水区无井钻遇成熟烃源岩,因此,烃源岩的分析一直是研究的难点。针对该难点制约了褶皱过渡带断裂体系和油气成藏模式分析等问题,基于大量一手的钻井、油田和地震资料,运用区域构造和沉积分析相结合的方法,利用气油比反推法预测烃源岩发育位置的手段,得出油气平面上均富集在构造发育部位、垂向上主要富集在浅层层序、构造是成藏主控因素等结论,并建立了"逆冲+泥拱+正断层"逆冲上盘成藏、"泥拱+正断层"成藏、"泥拱+逆冲+正断层"逆冲上盘成藏、"逆冲+泥拱+正断层"逆冲下盘成藏、"逆冲"逆冲上盘成藏5种油气成藏模式。该研究成果为泥拱相关构造的油气勘探指明了方向。
The source-roek analysis in Niger delta basin is seriously limited since there is no well drilled into mature source-rock in the deepwater area. Based on a large amount of primary drilling, production and seismic data, the regional structure and sedimentation analyses are combined to research the fault system and hydrocarbon accumulation pattern in the flod transition zone. The GOR inversion is used to predict tire source-rock position, It is concluded that the hydrocarbon mainly enriches in the part with well-developed structures along the lateral direction and in the shallow sequence along the longitudinal direction and structure is considered as the key controlling-factor of hydrncarbon accumulation. In addition, 5 hydrocarbon accumulation patterns are established, including ＂thrust＋ mud-diapir＋normal-fault＂ thrust upper-wall accumulation, ＂mud-diapir＋normal-fault＂ accumulation, ＂mud- diapir＋thrust＋normal＂ thinst upper-wall aeeumulation, ＂thrust＋mud-diapir＋normal-fault＂ Iower-wall accaumulation and ＂thrust＂ thrust upper-wall accumulation. This research could provide certain guidance to the hydrocarbon exploration in the structures related to mud diapir.
出处
《特种油气藏》
CAS
CSCD
北大核心
2018年第1期36-40,共5页
Special Oil & Gas Reservoirs
基金
国家"十三五"重大专项"非洲重点区油气勘探潜力综合评价"(2017ZX05032002)
中海油(中国)有限公司综合科研课题"西非被动大陆边缘盆地海相烃源岩评价方法研究"(YXKY-2015-ZY-07)
关键词
成藏模式
成藏主控因素
气油比反推法
泥拱构造
褶皱过渡带
尼日尔三角洲盆地
hydrocarbon accumulation pattern
key controlling -factor of hydrocarbon accumulation
GOR inversion
mud- diapir structure
fold transition zone
Niger delta basin
