焉耆盆地岩性油气藏勘探前景

Prospectiveness of Lithologic Reservoir in Yanqi Basin

焉耆盆地早、中侏罗世为一拉张型断陷盆地，具有先张后压的构造演化特征，这决定了侏罗纪盆地沉积体系发育的类型和展布特征。该盆地侏罗系中、下统为一套陆相含煤地层，具备油气生成和聚集的有利条件，特别是陡坡带扇三角洲体系和缓坡带辫状三角洲体系的广泛发育及种马场、宝浪苏木两大碎屑流沟道体系的发现，为该区岩性油气藏勘探工作展示了广阔的前景。总结了岩性油气藏在该区可能存在的几种分布模式，对进一步的勘探工作具有重要的参考价值。

： The result of structural recover shows that Yanqi basin is extensional rift subsidence basin during middle and early Jurassic， it is characterized from the tectonic evolution by firstly compressed and then extend． The evolution feature determined the types and distribution of sediment systems in Jurassic basin． Synthetical studies of depositional system， depositional models and petroleum geological conditions showed that the lower and middle Jurassic in this basin is a suite of coal measures strata， and they have favorable conditions to the formation of lithologic reservoir． Especially， widely developed fan delta system in north abrupt slope and braided delta in south gentle slope and discovery of Zhongmachang and Baolang coarse grain channel system provided a bright prospect for lithologic reservoir exploration． This paper summarized several possible distribution models of lithologic reservoir in this area， it will provide an important reference for oil and gas exploration．