鄂尔多斯盆地东部奥陶系盐下古地貌恢复及其对滩体的控制作用  

Palaeogeomorphological restoration of Ordovician subsalt and its controlling effect on beach bodies,eastern Ordos Basin

作　　者：张春林[1,2] 李剑[1,2] 陈鑫 吴庆超[4] Zhang Chun-lin;Li Jian;Chen Xin;Wu Qing-chao(Institute of Natural Gas Geology,PetroChina Research Institute of Petroleum Exploration and Development,Langfang065007,China;Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang065007,China;College of Geosciences,China University of Petroleum,Beijing102249,China;No.1Oil Production Plant of Daqing Oil Field Company,Daqing163000,China)

机构地区：[1]中国石油勘探开发研究院天然气地质研究所,河北廊坊065007 [2]中国石油天然气集团公司天然气成藏与开发重点实验室,河北廊坊065007 [3]中国石油大学(北京)地球科学学院,北京102249 [4]大庆油田有限责任公司第一采油厂,黑龙江大庆163000

出　　处：《天然气地球科学》2019年第9期1263-1271,共9页Natural Gas Geoscience

基　　金：国家科技重大专项“大气田富集规律与勘探关键技术”(编号:2016ZX05007-002);中国科学院战略性先导科技专项(A类)(编号:XDA14010403)联合资助

摘　　要：古地貌是控制鄂尔多斯盆地东部奥陶系盐下滩体发育的重要因素,寻找滩体发育带具有重要的勘探意义。运用印模法与沉积学分析法相结合的方法,通过残余厚度求取、压实恢复、沉积微相校正等步骤,恢复鄂尔多斯盆地东部盐下马五5亚段沉积前的古地貌特征,据此分析古地貌对研究区滩体的沉积控制作用。研究结果表明:研究区的古地貌特征整体呈现西北高、东南低、内部呈现隆洼相间的微古地貌沉积格局。岩心观察与薄片鉴定表明马五6亚段的内碎屑滩形成于碳酸盐岩台地内部的古地貌高部位,而膏盐岩发育于碳酸盐岩台地内部的古地貌低洼部位。Palaeogeomorphology is an important factor controlling the development of Ordovician Subsalt beach in the eastern Ordos Basin.It has important exploration significance to study the development zone of beach body.Based on the combination of impression and sedimentological analysis method,the palaeogeomorphological characteristics of Pre-Mawu5 deposition were restored through the steps of residual thickness calculation,compaction recovery and sedimentary microfacies correction in the eastern Ordos Basin.According to the above analysis,the controlling effect of palaeogeomorphology on the beach body was studied.The palaeogeomorphological characteristics of the study are generally high in the northwest,low in the southeast and micro-palaeogeomorphological sedimentary pattern with uplift and depression in the interior.Core observation and slice-identifying indicate that the intraclast beach of Mawu6 was formed in the high part of palaeogeomorphology in the interior of carbonate platform,while the gypsum-salt rock was developed in the low-lying part of palaeogeomorphology in the interior of carbonate platform.

关 键 词：鄂尔多斯盆地 奥陶系 古地貌 盐下 滩体 

分 类 号：P618.13[天文地球—矿床学]