伊通地堑莫里青地区双一段沉积相及与油气关系  

SEDIMENTARY FACIESES AND THEIR RELATIONS WITH OIL AND GAS IN SHUANG NO. 1 MEMBER OF MOLIQING AREA OF YITONG GRABEN

作　　者：杨玲 鲍志东[1] 侯鹏飞[1] 杜宜静[1] 

机构地区：[1]中国石油大学地球科学学院,北京102249

出　　处：《大庆石油地质与开发》2012年第3期30-35,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重大专项（2008ZX05030-05-001）和国家重点基础研究规划“973”项目（2006CB202300）资助.

摘　　要：以高分辨率层序地层学和沉积学理论为指导，综合地质、测井和地震等资料，将莫里青地区古近系双一段划分为一个中期旋回，其上升半旋回进一步划分为1个短期旋回和2个上升半旋回，中期旋回的下降和上升半旋回分别对应I砂组和Ⅱ砂组，上升半旋回内部的短期旋回则对应Ⅱ砂组的3个小层。在等时地层格架的基础上，在双一段内识别出扇三角洲、湖底扇和湖泊3种沉积相类型，从双一段Ⅱ砂组到I砂组沉积时期，湖底扇和扇三角洲沉积体发育呈不断萎缩的趋势。扇三角洲前缘相的水下分流河道微相和湖底扇相的辫状水道微相是油气聚集的有利相带。Guided by the theories of high-resolution sequence stratigraphy and sedimentology, Palaeogene Shuang No. 1 Member in Moliqing area is divided into a middle cycle ; the rising hemicycles of the member are further clas- sified into a short cycle and two rising hemicycles with the help of the geologic, logging and seismic data. The de- scending and rising hemicycles of the middle cycle are corresponding to No. Ⅰ and No. Ⅱ sand groups; and the short cycle inside the rising cycle is corresponding to three sub-layers of No. Ⅱ sand group. Based on the isochro- nous stratigraphy framework, three types of sedimentary facies as fan delta, sublacustrine fan and lake facies are discriminated in Shuang NO. 1 Member; The developments of the sublacustrine fan and fan delta deposits possess the trend of continuous shrink from the sedimentary period of No. Ⅱ and No. Ⅰ sand group in Shuang No. 1 Mem- ber. The underwater distributary channel micro-facies of fan delta and braided channel micro-facies of sublacustrine fan are favorable facies belts for oil and gas accumulation.

关 键 词：莫里青地区 双一段 沉积相类型 沉积演化 油气聚集 

分 类 号：TE121.3[石油与天然气工程—油气勘探]