江汉盆地古近系潜江组盐湖沉积特征与成藏模式  

Sedimentary characteristics and reservoir accumulation model of salt lake of Paleogene Qianjiang Formation in Jianghan Basin

作　　者：黄华 袁娟梅[2] 彭伟[2] 张亮[2] 文辉[2] HUANG Hua;YUAN Juanmei;PENGWei;ZHANG Liang;WEN Hui(Chongqing Fuling Shale Gas Exploration and Development Company,Sinopec,Chongqing 408000,China;Research Institute of Exploration and Development,Sinopec Jianghan Oilfield Company,Wuhan 430223,China)

机构地区：[1]中石化重庆涪陵页岩气勘探开发有限公司,重庆408000 [2]中国石化江汉油田分公司勘探开发研究院,武汉430223

出　　处：《岩性油气藏》2021年第2期9-16,共8页Lithologic Reservoirs

基　　金：中国石油化工股份公司重大专项攻关课题“江汉盆地油气聚集规律与精细评价关键技术”(编号:ZDP17009);中国石油化工股份有限公司科研项目“江陵凹陷新沟嘴组岩性油藏形成条件与分布”(编号:P15120);国家科技重大专项“涪陵页岩气开发示范工程”(编号:2016ZX05060)联合资助。

摘　　要：江汉盆地为典型的陆相盐湖盆地,古近系潜江组盐间地层为主力油气产层。为研究其盐湖沉积特征与成藏模式,开展了晚始新世潜江组沉积期的古地貌、古构造和古气候恢复,扫描电镜分析和砂体展布特征研究。结果表明:①江汉盆地潜江组“高山深盆”式古地貌和断层控制下稳定沉积的深凹古构造是盐湖盆地形成的基础,气候以亚热带干旱为主、干湿交替为辅,形成了多韵律沉积;②潜江凹陷潜江组岩性包括碎屑岩、碳酸盐岩、蒸发岩及其混合类型,其中盐类矿物来源于物源区水系携带的风化矿物质和深部热液物质;③研究区常规砂岩和非常规混积岩均见油气产出,常规砂岩油藏具有“源控富集、层控运移、砂控规模”的特征,非常规混积岩油藏具有“沉积控区块、源岩控层位”的特征。该研究成果对盐湖盆地油气勘探具有借鉴意义。Jianghan Basin is a typical continental salt lake basin.The main oil and gas producing layer is the salt interlayer of Paleogene Qianjiang Formation.In order to study the sedimentary characteristics and reservoir forming model of salt lake,the paleogeomorphology,paleostructure and paleoclimate of Qianjiang Formation Late Eocene were reconstructed,and SEM analysis and sand body distribution characteristics were carried out.The results show that:(1)The formation of the salt lake basin is based on the“high mountain and deep basin”paleogeomorphology and deep concave paleostructure controlled by faults.The climate is mainly subtropical drought,supplemented by alternation of dry and wet,forming multi rhythm deposits.(2)The lithology of Qianjiang Formation in Qianjiang sag includes clastic rock,carbonate rock,evaporite and their mixed types,in which salt minerals come from weathered minerals and deep hydrothermal materials carried by the water system in the source area.Both conventional sandstone and unconventional migmatite in the study area have oil and gas production.The conventional sandstone reservoir has the characteristics of“source controlled enrichment,strata bound migration and sand control scale”,while the unconventional migmatite reservoir has the characteristics of“sedimentary controlled block and source rock controlled horizon”.The research results can provide reference for oil and gas exploration in salt lake Basin.

关 键 词：盐湖沉积 古地貌 古环境 古气候 潜江组 古近系 江汉盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]