【作者】 石砥石；

【导师】 夏斌； 姜在兴； 张善文；

【作者基本信息】 中国科学院研究生院（广州地球化学研究所） ， 构造地质学， 2006， 博士

【摘要】 北西向断裂在沾化凹陷东部的油气成藏过程中占有重要的地位。论文通过大量基础地质资料、地震资料和区域构造背景资料，系统研究济阳坳陷北部主要断裂的分布及演化特征，结合断裂作用下油气成藏的物理模拟和数值模拟试验，研究断裂对油气成藏的控制作用。研究表明，沾化凹陷东部北西向构造带是多期运动叠加、后期断裂改造、形成多类型潜山的演化结果。沾化凹陷发育的北西向构造带的主控断层，均经历了逆冲、拉张反转全过程。由西向东的罗西、孤西、埕北—五号桩等3条北西向断层的活动强度逐渐增强，断层的活动速率分别为45m／Ma、65m／Ma和80m／Ma，北西向断层停止活动的时间由西至东逐渐变晚。多期运动叠加的结果形成了埕岛—垦东和埕东—垦利两条北西走向的潜山构造带。构造活动在时、空上的差异导致了不同类型潜山披覆构造形成及圈闭组合关系的差异。潜山披覆构造自南部垦东地区以高位潜山披覆背斜为特征，向北至孤东、埕岛地区以中、低潜山披覆背斜为主。沾化凹陷东部不同的构造部位，不同类型的构造，油气分布特征不同，油藏类型不同，组合类型和成藏模式也有所差异。在层系上主要富集于上第三系馆陶组和前第三系以下古生界为主要含油层系的潜山披覆构造带。主干断层良好的输导体系和新构造运动对油气形成分布有重要影响。油气运聚物理模拟试验结果证明，曲率大的断裂有利于油气运移；当砂层与断层上倾方向(或者是油运移的方向)所夹角小时有利于油向其中运移。结合构造演化和沉积埋藏史研究，流体包裹体两期的均一温度(100～130℃，140～160℃)反映了燕山期和喜山晚期且以喜山晚期为主的油气充注。油气成藏数值模拟结果显示孤西地区第一、第二排潜山聚集第三系生成的油气，也可以聚集部分石炭～二叠系煤系烃源岩生成的天然气，而第三、第四排潜山主要接受石炭～二叠系煤系烃源岩生成的天然气。根据综合研究的结果，指出在沾化东部地区近期寻找富集高产区块在桩海、孤北和垦东潜山披覆构造带、埕北和孤南洼陷带。研究的结果对预测沾化凹陷东部的下一步有利油气勘探区有重要的指导意义。更多还原

【Abstract】 The northwestward (NW) faults play an important role in the hydrocarbon accumulation in the eastern part of Zhanhua sag, Jiyang Depression. Based on the large number of geological, seismic and regional tectonic data, this paper studied systematically the distribution and their evolution characteristics of main faults in the eastern part of Zhanhua sag and their effect on hydrocarbon accumulation. The fault controlling effect on the hydrocarbon migration and accumulation was also studied by combining the physical and numerical experiments of hydrocarbon migration and accumulation. The results will benefits to forecast the favorable petroleum exploration area of eastern part of Zhanhua sag.The two NW structural belts, Chengdao-Kendong and Kendong-Guxi burial hill belts, in the eastern part of Zhanhua sag are the result of multi-tectonic superposition and later stage faulted reform. All main NW faults underwent the process of thrust first and then extension reversal. The activities increase from the west Luoxi Fault, Guxi Fault to the east Chengbei-Wuhaozhuang Fault, with the active velocity 45m/Ma, 65m/Ma and 80m/Ma respectively.The oil and gas distribution and hydrocarbon accumulation models are different in the different structural positions and different types of structures. Most petroleum accumulated in the Neogene Guantao Group and Lower Palaeozoic burial hill drape structure belts. The fault acted as the conducting system and the neotectoinc movement played an important role on the petroleum formation and distribution. At the same time, the physical experiment of hydrocarbon migration showed the large dip angle of fault is favorable to hydrocarbon migration.Based on the above study results, the favorable petroleum exploration area of eastern part of Zhanhua sag are Zhuanghai, Gubei and Kendong burial hills and Chengbei, Gunan sags.更多还原