鄂尔多斯盆地含铝岩系天然气成藏主控因素与勘探启示  

Main controlling factors and exploration enlightenment of aluminous rock series gas reservoirs in Ordos Basin,NW China

作　　者：张雷[1,2] 曹茜[1,2] 张才利 张建伍[1,2] 魏嘉怡[1,2] 李涵 王兴建[3] 潘星 严婷 权海奇[1,2] ZHANG Lei;CAO Qian;ZHANG Caili;ZHANG Jianwu;WEI Jiayi;LI Han;WANG Xingjian;PAN Xing;YAN Ting;QUAN Haiqi(Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an 710018,China;The National Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu 610095,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018 [3]油气藏地质与开发工程全国重点实验室,成都610095

出　　处：《石油勘探与开发》2024年第3期541-552,共12页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司“十四五”前瞻性基础性重大科技项目“致密气新区新领域资源潜力与富集规律研究”(2021DJ2101)。

摘　　要：基于野外露头、岩心、录井、测井、试气及分析化验等资料,采用天然气成藏与铝土岩成矿一体化研究方法,分析鄂尔多斯盆地含铝岩系有效储层发育控制因素、煤系烃源岩与含铝岩系的源储配置关系,构建天然气成藏模式,对煤下含铝岩系天然气勘探潜力进行评价。研究表明:(1)鄂尔多斯盆地含铝岩系的有效储层主要为一水硬铝石含量超过75%,具有多孔状残余豆鲕、碎屑结构的蜂窝状铝土岩,溶蚀孔为主要储集空间;(2)铝土岩储层形成模式为夷平化作用提供含铝岩系发育的物质基础、岩溶古地貌控制含铝岩系发育、陆表淋滤作用改善储集性能;(3)晚石炭世—早二叠世,受湿热气候环境和海平面变化控制,古陆或古岛边缘的相对低洼带发育典型的煤-铝-铁三段式地层结构;(4)煤系烃源岩广覆式生烃,天然气在煤下含铝岩系储层富集,为源下成藏;(5)中国华北陆块的上石炭统—下二叠统含铝岩系气藏呈透镜状点群式聚集,勘探潜力大,有望成为华北克拉通上古生界重要的天然气勘探新领域。Based on the data of outcrop,core,logging,gas testing,and experiments,the natural gas accumulation and aluminous rock mineralization integrated research was adopted to analyze the controlling factors of aluminous rock series effective reservoirs in the Ordos Basin,NW China,as well as the configuration of coal-measure source rocks and aluminous rock series reservoirs.A natural gas accumulation model was constructed to evaluate the gas exploration potential of aluminous rock series under coal seam in the basin.The effective reservoirs of aluminous rock series in the Ordos Basin is composed of honeycomb-shaped bauxites with porous residual pisolitic and detrital structures,with the diasporite content of greater than 80%and dissolved pores as the main storage space.The bauxite reservoirs are formed under a model that planation controls the material supply,karst paleogeomorphology controls diagenesis,and land surface leaching improves reservoir quality.The hot humid climate and sea level changes in the Late Carboniferous–Early Permian dominated the development of a typical coal-aluminum-iron three-stage stratigraphic structure.The natural gas generated by the extensive hydrocarbon generation of coal-measure source rocks was accumulated in aluminous rock series under the coal seam,indicating a model of hydrocarbon accumulation under the source.During the Upper Carboniferous–Lower Permian,the relatively low-lying area on the edge of an ancient land or island in the North China landmass was developed.The gas reservoirs of aluminous rock series,which are clustered at multiple points in lenticular shape,are important new natural gas exploration fields with great potential in the Upper Paleozoic of North China Craton.

关 键 词：鄂尔多斯盆地 石炭系本溪组 二叠系太原组 含铝岩系 煤-铝-铁三段式地层结构 源下成藏 

分 类 号：TE122[石油与天然气工程—油气勘探]