七东区下侏罗统八道湾组储层特征及评价

Reservoir characteristics and evaluation of Badaowan Formation of Lower Jurassic in
East Seventh Area

汪彦 彭军 陈果 张晓东 赵冉 李振

西南石油大学，四川 成都 610500 四川石油管理局地质勘探开发研究院，四川 成都 610213 四川石油管理局地球物理勘探公司，四川 成都 610213

新疆油田七东区目的层位为近物源辫状河流沉积。在沉积体系研究的基础上，结合岩石薄片观察和分析化验资料显示：八4和八5为2套大型的砂砾岩—中（细）砂岩—粉砂岩—泥岩正韵律旋回沉积，储层段是以凝灰岩岩屑为主的岩屑或长石质岩屑砂岩；层内发育着以次生溶孔与微孔－弯片状及管束状喉道为主的孔喉组合。根据孔喉参数之间的差异，将八4和八5主力储层划分为4类不同级别的储层。研究区内第I类储层最多，第II、III类次之，第IV类最少。

It is indicated that the target formation in the East Seventh Area is the braided stream deposit of proximal deposit by the study of
correlation parameters of Badaowan Formation of Lower Jurassic in the area. Based on the deposition system research with assay and
analysis and thin)section identification, Ba4 and Ba5 are two sets of large)scale positive rhythm sedimentary cycles that is made of
glutenite, medium ’fine(sandstone, siltstone and mudstone. The rocks of reservoir are mainly litharenite or feldspathic litharenite. It
developed the pore throat combination which is mainly made of secondary dissolved pores and micropores!and curved-lamellar and
pipe-throat channels. According to the difference between pore throat parameters, Ba4 and Ba5 major reservoirs can be divided into
fourtypeswith differentranks.TypeⅠis the mostin the study area, typeⅡand typeⅢ,take the second place, and typeⅣisleast.