关于伊陕斜坡靖边油区上三叠统延长组长7界面的讨论  

Discussion on Chang 7 Boundary in Upper Triassic Yanchang Formation in Jingbian Oilfield of Yishan Slope

作　　者：苗小龙 杜燕 戚保良 于波 张海 刘成文[2] 张涛[2] 韩华峰[2] 张小东[2] 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [2]延长油田股份有限公司靖边采油厂,陕西榆林718500

出　　处：《宁夏大学学报（自然科学版）》2015年第3期279-283,287,共6页Journal of Ningxia University(Natural Science Edition)

基　　金：国家科技重大专项基金资助项目(2011ZX05008-004-70)

摘　　要：伊陕斜坡作为鄂尔多斯盆地的主体部分,油气资源丰富,其中的主要生油层为中生界上三叠统延长组长7油层组.区域上,长7油层组的界定长期以张家滩页岩(K1)作为重要标志.而在靖边油区的某些地区,由于区域性标志的缺失,长7油层组的界定成为难点.以靖边油区测井曲线为基础,根据基准面旋回与测井相特征来界定长7油层组,即长7油层组发育于中期旋回的基准面较高处,为滨浅湖-三角洲环境.该方法划分的长7油层组,便于研究区域内等时沉积地层的发育,能够更好地与区域地质相联系,尤其与盆地沉积环境演化特征相匹配.Being the main part of Ordos Basin,Yishan Slope has abundant oil and gas resources,the main source bed of which is Chang 7oil layer,upper triassic Yanchang Formation of mesozoic erathem.For a long time,the demarcation of Chang 7oil layer is marked regionally by Zhangjiatan shale（K1）.In certain areas of Jingbian Oilfield,however,its demarcation has become difficult due to the absence of regional mark.Based on the borehole log of Jingbian Oilfield,the Chang 7oil layer is demarcated on the basis of base level cycle and log facies characteristic.That is,the Chang 7oil layer developed in a higher position of base level of mid-term cycle,which is shore shallow lake-delta environment.The Chang 7 oil layer demarcated with the above method is convenient for the study of isochronal sedimentary strata＇s growth in this area,and is better correlated with the areal geology,especially matched with the evolutionary character of basin sedimentary environment.

关 键 词：伊陕斜坡 靖边油区 延长组 长7油层组 界面特征 

分 类 号：P539.2[天文地球—古生物学与地层学]