New fields,new types and resource potentials of oil-gas exploration in Yin'gen-Ejinaqi Basin
Yin'gen-Ejinaqi Basin is a large sedimentary basin with a relatively low degree of oil-gas exploration in China.The explora-tion practice since the 13th Five-Year Plan(2016-2020)has confirmed that the Cretaceous Baiyingebi Formation is the main source rock series,and three assemblages develops in Carboniferous-Permian,Jurassic,and Cretaceous reservoirs,forming various types of oil-gas pools such as lithological and structural-lithological reservoirs,bedrock buried-hill reservoirs,and unconventional reservoirs.However,the development characteristics of source rocks,main controlling factors of hydrocarbon accumulation,and resource po-tentials of various sags vary due to the differences of late tectonic movements in Yin'gen-Ejinaqi Basin,thus affecting the overall cost-effective development of the basin.Based on recent exploration practices and understandings,as well as analyses of the basic ac-cumulation conditions,this paper conducted a new round of evaluation on the resource potentials of Yin'gen-Ejinaqi Basin.The re-sults indicate that there is great resource potentials of the Cretaceous lithological and structural reservoirs in Chagan sag,Guaizihu sag,Hari sag,and Tiancao sag,which are the main areas for oil-gas exploration and development.The Carboniferous-Permian bur-ied-hill cave-fractured reservoirs in bed rocks in Lujing sag,Guaizihu sag,and Jigeda sag can provide favorable conditions for high production and hydrocarbon enrichment and are new types of resources for cost-effective exploration.The Cretaceous shale oil and reservoirs in Chagan sag,Guaizihu sag,and Hari sag and the Jurassic lithological reservoirs from the coal-bearing source rocks in Aoxinan sag have certain exploration potential and are new fields for further exploration.In Yin'gen-Ejinaqi Basin,the conventional oil resources amount to 14.39 × 108 t,the conventional gas resources amount to 451.17 × 108 m3,and the unconventional shale oil re-sources amount to about 5.6×108 t,showing excellent exploration prospects.
NETL
NSTL
万方数据
维普
