满西地区石炭系层序地层分析

Sequence stratigraphic analysis of Carboniferous in West Man-jiaer

利用层序地层学的原理和方法,综合利用塔里木盆地满西地区石炭系的岩心、测井和地震资料,在研究区石炭系识别出了7个层序边界界面,包括3个Ⅰ型层序边界及4个Ⅱ型层序边界。相应地,将石炭系划分为6个沉积层序(2个Ⅰ型层序,4个Ⅱ型层序)和13个体系域,除陆架边缘体系域不发育外,其它体系域发育齐全。满西地区石炭系沉积于陆棚区,为海陆交互的碎屑岩与碳酸盐岩沉积,区内石炭系层序地层框架相当于Vail模式的陆架坡折向陆的部分。

According to the principle and method of sequence stratigraphy, this paper systematically analyzes the core, well logging and seismic data of Carboniferous of West Manjiaer region in Tarim Basin, the Carboniferous could be divided into seven sequence boundaries, including three sequence boundaries of type Ⅰ and four sequence boundaries of type Ⅱ. Accordingly, six sequences (two sequences o( type Ⅰ and four sequences of type Ⅱ) and thirteen sys- tem tracts are given, including Lowstand system tracts, Trans-gressive system tracts and Highstand system tracts, hut shell margin system tracts are not developed. West Manjiaer region was on the continental shelf in Carboniferous which formed a series of mul-titype and multicycle carbonate rocks, evaporates, clastic rocks and transitional rocks. The sequence stratigraphic patterns of West Manjiaer region are similar to the shoreward part of patterns which proposed by P. R. Vail.