Characteristics and Distribution Prediction of Source Rocks of Lower Cambrian Sholbluk Formation in Tarim Basin

Many scholars pay attention to the development and distribution of source rocks in Sholbluk Formation. Based on the field outcrop and basin well drilling data, this paper analyzed the lithologic combination and sedimentary environment characteristics of source rocks in Shorbluk Formation, and combined with seismic data, the distribution of source rocks in Shorbluk Formation was comprehensively predicted. According to the sedimentary environment, the source rocks of Shoerbluk Formation in Tarim Basin can be divided into two types: platform lagoon facies and slope-shelf facies. The source rocks of platform lagoon facies are mainly fine silty dolomite and argillaceous dolomite, with TOC of 0.16%～2.68%. Controlled by the paleotectonic pattern of Precambrian, they are mainly developed around the lagoon facies formed in the platform, with a cumulative thickness of 40～50 m. The source rocks of slope-shelf facies are mainly argillaceous limestone, micrite and mudstone, with TOC of 0.06%～4.00%. They are mainly developed in the outer gentle slope-shelf sedimentary environment under the background of gentle slope platform, with a cumulative thickness of 30～120 m. The closer to the shelf direction, the higher the TOC content. The research results are a further supplement to the lower Cambrian source rocks in Tarim Basin, and provide a certain reference for the exploration of deep Cambrian in the basin.