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通过对尕斯库勒砂西区块N1—N21油藏Ⅺ、Ⅹ—Ⅸ、Ⅷ—Ⅵ、Ⅴ—Ⅰ油层组段沉积相特征、沉积体系展布及演化规律的综合分析,认为砂西区块N1—N21油藏从下向上发育滨浅湖亚相、辫状河三角洲前缘-滨浅湖亚相、辫状河三角洲平原-前缘亚相,整体为一套反旋回沉积.在此基础上分析了砂西区块N1—N21油藏沉积相与油气分布的关系.结果表明,分布于Ⅷ—Ⅵ油层组的辫状河三角洲分流河道及构造高部位的河口坝、远砂坝微相砂体为该地区的主要储集体,Ⅴ—Ⅰ油层组发育的泛滥平原微相泥岩为该区的区域性盖层.
Based on the comprehensive analysis of sedimentary facies, distribution and evolution of sedimentary system in N1-XIX, Ⅷ-Ⅵ, Ⅴ-Ⅰ oil reservoirs of Block N1-N21 in Block Xiushikule, In the N21 reservoir, the shore-shallow lake subfacies, the braided river delta front-shore shallow lake subfacies, the braided river delta plain-frontier subfacies are developed as a set of anti-cyclonic sediments. The relationship between sedimentary facies and oil-gas distribution in N1-N21 reservoir in the Xiashi block is analyzed.The results show that the braided river delta distributary channel distributed in the Ⅷ-Ⅵ oil layer and the estuarine dam and the distal sandblast microfacies For the main reservoirs in this area, floodplain microfacies developed in Ⅴ-Ⅰ oil layer are the regional cap rocks.