吐哈盆地神泉油田三间房组沉积微相特征

Gas-Oil Accumulation and Depositional Microfacies Characteristics of Sanjianfang Formation in Shengquan Oilfield of Turpan-Hami Basin．

三间房组是吐哈盆地神泉油田的主要储集层和产油层，其沉积微相的研究对该油田的勘探开发具有十分重要的指导意义。研究认为，中侏罗统三间房组储集层为一套近物源、短水流搬运的粗碎屑沉积岩，属河流－滨浅湖沉积体系辫状河三角洲相，可进一步划分为分流河道、心滩、漫堤（滩）、决口扇，水下分流河道（包括水下心滩砂坝）、侧缘砂、前缘席状砂等微相；不同沉积微相油层物性及含油性差异明显，分流河道、心滩、水下分流河道（包括水下心滩砂坝）微相的油层物性好，是油气聚集的有利相带，漫堤（滩）、席状砂等微相相对较差。

： As the major reservoir in Shengquan oilfield， the Sanjianfang formation has characteristics which are very important to its rolling exploration and development． The study shows that： ① the Sanjianfang formation reservoir in Middle Jurassic is a set of coarse grain detrital sediment， belongs to river-shallows lake beach depositional system with braided river delta facies； ② it can be further divided into the distributary channel， channel bar， levee(beach)， crevasse-splay， subaqueous distributary channel， sheet bar， plain， and frontal sediment of braided stream sedimentary subfacies． ③ different sedimentary microfacies showed obvious different reservoir lithophysical properties and oil-bearing capabilities． Reservoirs of braided channel， channel bar， subaqueous braided channel microfacies have quite good lithophysical properties， they are favorable facies belt for oil-gas accumulation， while those of the overbar， levee(beach) and sheet sand are relatively poor．