【摘要】 毕店地区位于多物源交汇带,沉积相带变化快,各个物源作用范围界定不清,受不同相带控制的砂体发育规律认识不清。通过对研究区沉积特征及含油性研究,对确定砂体规模和分布范围、寻找岩性-构造复合型油气藏有重要现实意义。本文在岩心、录井、测井及测试分析等资料研究基础上,认为研究区西部、北部、东北主要发育曲流河三角洲沉积体系,南部发育扇三角洲沉积体系以及东南部发育重力流与湖泊沉积体系;研究层段的基准面经历过6次上升和3次下降过程,在基准面相对较低时期,其主体沉积微相为水下分流河道、河口坝(前缘砂),沉积砂体较厚,水下分流河道延伸范围广,河道分支较多;在基准面相对较高时期,其主体沉积微相为远砂坝(席状砂)、湖相,沉积砂体薄,水下分流河道规模小、数量少,远砂坝及席状砂大面积发育。结合构造、生产动态数据,认为研究区油藏属于构造油气藏、岩性油气藏和复合油气藏,油气聚集受构造情况、优势沉积相,基准面升降等控制明显。更多还原

【Abstract】 Bidian district is located in the central of Biyang sag. Due to the complexity of the variation of the sedimentary facies and the influence of different provenances,it is uncertain to figure out the rule of sand body morphology. To search for the lithologic and structral hydrocarbon reservoirs,it is necessary to make certain of the size and distribution of sandbody. On the basis of core,test analysis and logging data,this paper carefully discussed the sedimentary facies of the third member of Hetaoyuan foramtion in Bidian area,Biyang sag,which developed a set of meandering river delta,fan delta and gravity flow sedimentary systems. The base level of study layers has experienced 6 rising processes and 3 descending processes. When the base level is relatively high,the main miorofacies are underwater distributary channels and mouth bars( delta front sheet sands),and the sand bodies are relatively thick,among which the underwater distributary channels extend widely; while the base level is relatively low,the main miorofacies are distal bars( sheet sands),lake facies,with relatively thin sandbodies,of which the scale and the quantity of underwater distributary channels are decreased,meanwhile distal bars and sheet sands have a large distribution. According to the study of sedimentary facies, structural map, production performance data,results show that structural,lithologic and composite reservoirs hydrocarbon reservoirs develop mainly in this area. By investigation of classical hydrocarbon reservoirs,faults,lithologth and facies that controlled the hydrocarbon reservoirs, it shows that hydrocarbon accumulation are controlled significantly by geological structure and dominant facies,and the rising and falling of the base level.更多还原