松辽盆地北部巴彦查干地区嫩江组三段沉积相及有利区预测

Sedimentary Facies and Favorable Areas of the Third Member of Nenjiang Formation in Bayanchagan Area in the North of Songliao Basin

摘要: 巴彦查干地区黑帝庙油层具有较大的油气勘探潜力，是下步增储上产的重点地区之一。为了弄清有利储层的分布规律，利用岩心、测录井、地震及测试分析资料，系统分析了研究区嫩江组三段黑帝庙油层高分辨率层序地层、沉积微相类型、沉积相分布及其演化规律，并对有利区进行了预测。通过不同级别层序界面的识别，将嫩江组三段划分为1个长期基准面旋回和3个中期基准面旋回，建立高分辨率层序地层格架；在单井相划分、连井沉积相对比分析基础上，研究区浅水三角洲–湖泊沉积体系识别出2种亚相7种微相类型，明确了沉积相演化规律；确定研究区最有利的储集砂体为是河口坝及砂坝沉积，次为席状砂。根据沉积相、断裂及试油成果划分出两类有利区，明确了研究区下一步勘探方向。

Abstract: Heidimiao oil layers in Bayanchagan area have a great hydrocarbon exploration potential and increase reserves and production priority regions in the next step. In order to study the regular distribution of the favorable reservoirs, in combination with core, logging, log and seismic data, high-resolution sequence stratigraphy, the sedimentary microfacies types, sedimentary facies distribution and evolution regulars in the third member of Nenjiang formation of Heidimiao oil layers in the area were analyzed, and moreover the favorable reservoir facies belts were predİcted. On the basis of recognition of different levels sequence interface, the third member of Nenjiang formation can be divided into one long-term base level cyclical sequence and three middle-term base level cyclical sequence, the high-resolution sequence stratigraphic framework was established. Byanalyses of individual well sedimentary facies and section sedimentary facies, 7 microfacieses and 2 subfacieses of the shallow delta and lake sedimentary system, the sedimentary evolution laws were ensured; the debouch bar and sand bar deposits are the most favorable reservoir for the oil and gas accumulation, which are followed by the underwater distributary channel and the sheet sand. According to sedimentary facies, fracture characteristic and oil test results, two types of favorable areas were predicted, the next exploration direction is defined in the study area.