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苏20区块主要产气层为中二叠统下石盒子组第8段,其沉积相类型及特征长期倍受众多研究机构和学者的争议。以岩心、岩屑与电测资料综合解释地质剖面为依据,对苏20区块下石盒子组盒8段及山西组划分出了自下而上两种沉积相类型:曲流河系、辫状河系。在的微相分析基础上,分别建立了缓坡型辫状河与多河道低弯度曲流河两种沉积模式,认为最有利的储集砂体主要为心滩和边滩叠置砂体,其次为河床滞留砂体。上述沉积相类型划分和沉积模式的建立为田苏20区块储集相带预测、储层评价以及大规模开发奠定基础。
The major gas-producing zone in Block Su 20 is the eighth member of the Lower Permian Lower Shihezi Formation. The types and characteristics of sedimentary facies have long been disputed by many research institutions and scholars. Based on the comprehensive interpretation of core sections, cuttings and electrical data, the authors divided bottom-up two types of sedimentary facies into Box 8 and Shanxi Formation of Lower Shihezi Formation in Block Su-20: meandering river system, River system. Based on the micro-facies analysis, two depositional models of gentle braided river and multi-river low-curvature meandering river are established, respectively. It is considered that the most favorable reservoir sandstones are mainly sandbodies stacked on the heartland and side beach, followed by Retain sand body for river bed. The establishment of sedimentary facies classification and depositional model above lays the foundation for the prediction of reservoir facies belt, reservoir evaluation and large-scale development in Tiansu-20 block.