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准噶尔盆地彩南地区下侏罗统沉积特征

DOI: 10.7605/gdlxb.2008.03.006, PP. 271-276

Keywords: 准噶尔盆地,彩南地区,侏罗系,沉积环境,网状河,沉积相

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Abstract:

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。

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