鄂尔多斯盆地长9段沉积物源分析  

Sedimentary source study of Chang 9 interval of Yanchang formation,Ordos basin

作　　者：刘璇[1] 丁晓琪[1,2] 万友利[1] 刘梅[1] 

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]西南石油大学"油气藏地质及开发工程"国家重点实验室,四川成都610500

出　　处：《东北石油大学学报》2014年第1期10-16,1-2,共7页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(41302115);博士后科学基金项目(2012M511941)

摘　　要：近年来,鄂尔多斯盆地长9段钻遇一批工业油流井,显示长9段油藏具有良好的勘探潜力.由于对个别区域的物源存在争议,影响勘探进程.为确定长9段沉积物源,对长9段野外露头、岩心进行取样,通过偏光显微镜对砂岩薄片进行观察,获得大量关于轻、重矿物组分的信息.根据矿物含量组合特征,结合周缘露头、地质背景及古水流的测定,分析母岩及物源方向.结果表明:研究区内不同区域的重、轻矿物组合特点明显不同;长9段沉积期,主要存在北东、北西、西、南西及南部5个物源,具有典型的山间型盆地的特征.这些物源在盆地中心的吴起、富县一线发生汇聚.盆地西物源的存在说明南北向的中央古陆梁可能存在,中央古陆梁提供部分西物源;盆地南物源的存在说明宁县、正宁、宜君地区具备油气富集条件,具有油气勘探潜力.Several commercial oil flow wells have been drilled in Ordos basin's Chang 9 formation in the last few years,.They all showed a great prospect of exploration.But exploration process has been delayed because of some arguments about the provenance of particular areas.Determining the provenance of Chang 9 interval can provide us with a better understanding of block's geology,and obtain the evidence of exploration.In this study,we get samples from outcrop and cores.By using polarizing microscope to observe sand stone slice,more information about heavy and light mineral compositions has been obtained.Based on the mineralogical composition,by measuring the ancient water flow combined with peripheral outcrop,and the geological back ground,we can find out that different district has different characteristics of the heavy and light mineral combination.What's more,Chang 9 sedimentary period is a typical intermountain basin,it mainly comes from five sources.They are distributed in northeast, northwest,west,southwest,south respectively,and converge at Wuqi and Fuxian in the center of the basin.The existence of the east source shows there might have north-south central ancient anteclise that provide a part of west sediments.While existence of the south source shows the district of Ningxian, Zhengning,and Yijun have condition to form hydrocarbon enrichment areas with exploration potential.

关 键 词：物源 重矿物 轻矿物沉积 长9段 鄂尔多斯盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]