陇东地区前侏罗纪古地貌及油藏成藏规律研究  

Research on Palaeogeomorphic Features of Pre-Jurassic and Accumulation Regularity of Oil Reservoir in the Area of Eastern Gansu,Ordos Basin

作　　者：朱静[1,2,3] 李文厚[1] 韩永林[2,3] 袁珍[4] 李卫成[2,3] 

机构地区：[1]西北大学地质学系,西安710069 [2]中国石油长庆油田公司勘探开发研究院,西安710021 [3]低渗透油气田勘探开发国家工程实验室,西安710018 [4]西安石油大学油气资源学院,西安710065

出　　处：《沉积学报》2010年第6期1229-1237,共9页Acta Sedimentologica Sinica

基　　金：国家重点基础研究发展规划(973计划)项目(编号:2003CB214602)资助

摘　　要：陇东地区以往对油气地质方面的研究多聚焦于三叠系,侏罗系的研究相对比较零散,缺乏整体性、系统性;限于当时的基础资料、研究目的及认识,研究的精度和深度有一定的局限性,精细地质刻画及与生产实践的结合程度较低。对陇东地区古地貌特征和成藏规律的研究,作为对全盆地地质资料的补充和佐证,无疑具有其必然性和必要性。本文采用残留厚度和补偿厚度印模法及沉积地质综合方法恢复出陇东地区前侏罗纪古地貌形态,并首次做出其三维模拟还原图;依据已探明油藏空间分布,结合地貌形态、成藏条件等分析,总结出研究区古地貌油藏六种成藏模式。勘探实践证实,古地貌油藏受控因素多,古地貌形态特征仅仅是受控因素之一。In previous achievements,depositional system,paleogeomorphology,geological evolutionary and sedimentary characteristics of Ordos basin has been quite clearly recognized.However,the research precision and depth in local area still has certain limitation.As geological data＇s supplement and corroborative evidence of Ordos basin,the research on precise depiction of geological features,sedimentary characteristics as well as their matching relationship with practical production in local area,undoubtedly,has its necessity and inevitability.Most of the previous researches on petroleum geology in the eastern Gansu were focused on Triassic,and the research on Jurassic is few,scatter,and lacking of integration and systematicness.The petroleum exploration history on Jurassic went through three stages：most of the achievements are mainly on regional geological surveying,researches on Jurassic are few（before 1970s）;Several oil fields of Jurassic,such as Maling,Yuancheng,were successively founded in study area,and Fuxian Formation,Yan＇an Formation of Jurassic become the major explorative horizon（form 1970 to 2000）;New oil reservoirs of Y10,Y9 and Y8 member of Yan＇an Formation are founded continuously in local regional（from 2000 to now） .In the past few years,exploration practice indicated that Y10 and Y9 members are the main oil-bearing layer of Yan＇an Formation,owning great resource potential.Paleogeomorphic form is the basic factor of Y8-Y10 oil reservoir.In view of petroleum accumulation of Jurassic controlled by paleogeomorphic forms,this paper will rebuild the paleogeomorphic formwork of pre-Jurassic,and first make up the 3D simulation restored maps,which are based on geological analysis（such as sedimentary background,tectonic setting）,changing tendency of sand layer thickness and formation thickness of each members（especially the formation thickness of Y10 Formation）,calculating key parameters（such as ancient landform evaluation difference,slope gradient,paleocurrent direction）,combining w

关 键 词：陇东 前侏罗纪 延安组 古地貌 成藏规律 

分 类 号：P531[天文地球—古生物学与地层学] TE122.2[天文地球—地质学]