东营凹陷辛东地区油气成藏规律的研究.pdf

}两姜从大量扎实可靠的基础资料入手,运用大量的地化分析数据,围绕研究区成藏存在的问题,利用油气地质新理论和新方法,开展了层序、沉积及储层、构造特征、油一源及油气运移、油气成藏主控因素等研究,重点开展了构造特征、沉积及储层、成藏动力与油气成藏模式等方面的研究。研究表明,辛东地区具有中央隆起带与新立村构造的双重特点,断裂发育具有东早西晚、东强西弱的特点,控制构造形成演化的二级断层均为近东西向。经过单井相、连井剖面相以及平面相分析研究,确定研究区古近系沙河街组主要发育了五种沉积相类型:河流相、三角洲相、浊积扇、深湖一半深湖相、滨浅湖相; 沉积微相类型主要有滩坝、河口坝、远砂坝、分流河道、支流间湾等,其中以三角洲的河道砂体、河口坝物性条件最好;层系上沙三上与沙二段储层是最为有利的储层。研究区油气藏形成条件优越,断裂是控制该区油气成藏的主导因素。根据成藏动力,辛东地区划分为下部沙三中下一沙四段自源封闭成藏动力学系统,中部沙三上一沙一段它源半封闭成藏动力学系统和上部东营组一明化镇组它源开放成藏动力学系统。其中下部成藏动力学系统是原生油藏形成的有利地区,上部成藏动力学系统是次生油臧形成最有利的地区,其中中部成藏动力学系统成藏最为有利。综合分析建立了成藏模式,通过对典型区块解剖,结合各个区块特点,对所有失利探井进行精细分析,对有利勘探地区进行了合理的预测,确定了下步研究方向。关键词:沉积特征,成藏动力,成藏模式,辛东地区,东营凹陷 Study OilReservoir Forming Rule ofXindong area inDongying Depression LiuYunlan(Geological Engineering) Directed by Associate Professor Jiang Youlu Abstract Based on a amount ofraliable basic data,structural characteristics,sedimentary, reservoir,reseroir-forming dynamic and pattem are studied toresolve thepresent problem about reservoirforming machinasim conclusions are as follows:there are double characters—the central uplift beltstructure and XinLicun area. the east faultformed ealy withstrong tectonic movement,while thewest one formed later with weaker tectonization,the forming ofconstructions are contoled by fault, whose trend isnearly east‘ are fivetypes ofsedimentary faciesdeveloping in thelower paleogene group Es;they are fluvial faces,delta faces,turbidite fans,deep and semi·deep lakefaces and coastal pore ratioandpermeability ofdetla channel sand and estuarine baristhe bestone,while thereservoirs bearing intheformation Es35 and Es2arethe reservoirforming condition inthis area iS well;the dominant factor of reservoirforming theanalysis ofreservoir forming dynamic,three types ofpetroleum reservoir-formingdynamic system areclassified, which are as follows:underneath Es3Z'X-Es4 authigenic closeddynamic system,middle Es35_ES allochthon