Abstract: Based on the detailed core description，combined with the correlation analyses of a great deal of exploitation wells，we analyzed the microfacies and distribution characteristics of the skeletal sandbodies of the upper part of Jurassic Badaowan Formation and the lower part of overlying Sangonghe Formation in the Cainan area in eastern Junggar Basin. The results indicate that the Member 3 of the Badaowan Formation and the Member 1 of the Sangonghe Formation in Cainan area were dominated by an anastomosed fluvial facies. Three types of sedimentary subfacies(channel，levee and flood plain)and six types of microfacies were identified in this area. The main reservoir sandbodies are channel sandbodies and crevasse splay sandbodies. The channel sandbodies occur as narrow elongated bodies which are connected with each other，with the width of less than 1000m，ranging from 300m to 800 m. The crevasse splay sandbodies are smaller in scale and occur as a lenticular shape in the section.

Key words: Junggar Basin, Cainan area, Jurassic, sedimentary environment, anastomosed fluvial, sedimentary facies

摘要： 根据岩心的精细描述，结合大量开发井的对比分析，研究了准噶尔盆地彩南地区侏罗系八道湾组上部和三工河组下部砂层组的沉积微相和骨架砂体的分布特点。认为研究区侏罗系八道湾组第3岩性段（BD₃）和三工河组第1岩性段（S₁）是一套网状河流相沉积。网状河流相可进一步划分为3种亚相（河道、堤岸和越岸湿地）和6种微相类型。主要的储集体是河道砂体和个别决口扇砂体。在平面上河道砂体呈狭窄、相互连接的条带状，砂体的宽度一般在1000m以下，大多为300～800m；决口扇砂体规模一般较小，在横剖面中呈凸透镜状，在平面上常常呈舌状或叶状分布。

关键词: 准噶尔盆地, 彩南地区, 侏罗系, 沉积环境, 网状河, 沉积相

CLC Number: 

• P512.2