断陷湖盆辫状河三角洲储层构型解剖 ——以东辛油田营66断块沙二段为例

Architecture analysis of braided river delta reservoir in rift lake basin: taking second Member of Shahejie Formation in Ying 66 fault block of Dongxin Oilfield as an example

张瑞香 王延章 孔雪 车雄伟 邴欣 戴厚柱3

中国石油大学（华东）胜利学院油气工程学院，山东 东营 257061 中国石化胜利油田分公司东辛采油厂，山东 东营 257000 中国石化中原油田分公司勘探开发研究院，河南 濮阳 457001

College of Petroleum Engineering, Shengli College, China University of Petroleum, Dongying 257061, China Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257000, China Researh Insititute of Exploration and Development, Zhongyuan Oilfield Company, Puyang 457001, China

东辛油田营66断块沙河街组二段发育辫状河三角洲储层，砂体发育频繁，非均质性强，剩余油分布复杂。文中采用层次分析法及建筑结构要素法，对辫状河三角洲进行了详细剖析，识别出层状砂砾岩、交错层理中砂岩、波状层理细砂岩等6种岩相，划分出水下分流河道主体、水下分流河道侧缘、河口坝主体和坝缘等4个3级构型单元。早期阶段，河道分岔频繁，河道下切河口坝，形成“河在坝上走”的沉积模式；中期阶段，河道分支由岔口分流向河道侧向决口演变；晚期阶段，河道侧向决口明显增多，主河道侧向侵蚀叠置。根据储层解剖分析，建立了区内辫状河三角洲储层近端—中端—远端构型模式，可为后期剩余油的挖潜开发提供依据。

The second Member of Shahejie Formation in Ying 66 fault block of Dongxin Oilfield developed braided river delta reservoir with sand body frequently developped, strong heterogeneity and complex remaining oil distribution. On the basis of core and well logging data, the braided river delta was analyzed by the analytic hierarchy process and building structure element method. Six lithofacies were identified, such as Smm and Smf, and the reservior was divided into four three-level configuration units, the main body of underwater distributary channel, the side edge of underwater distributary channel, the main body of bar and the edge of bar. In the early stage, the river channel bifurcated frequently and down-cutted the mouth bar, that formed a sedimentary model of "river goes on the bar". In the middle stage, the river branch changed from bifurcated diversion to river side crevasse. In the later stage, the river side crevasse increased obviously, and the main river channel was side corroded and overlaped. According to architecture analysis of braided river delta reservoir, the configuration model of proximal end， middle end，distal end in the area is estabilished, which can provide basis for the exploration of remaining oil in the later stage.

10.6056/dkyqt202002006