【作者】 彭胜琴；

【导师】 蒲仁海；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2009， 硕士

【摘要】 杭锦旗地区是鄂尔多斯盆地的一个重要勘探区块,元古界是该区有油气藏发现的一个全新的勘探目的层。参考了前人的地层划分方案,将工区内的地层展开对比,统一了工区内钻井的分层方案;明确了各地层层系的展布趋势;追踪解释了杭锦旗地区T₉、T₁₂、T₁₃、T_g等的地震反射层位;制作了相应各层的视铅垂深度构造图、沉积厚度图等图件;假定沉积厚度受古构造升降格局所控制,分析了杭锦旗地区的元古界古构造面貌与演化;根据该区所提取的地震属性以及野外露头及钻井岩心的总结和分析,得出了该区的主要的沉积特征。并根据古构造演化和今构造特征与油气运聚散的关系,及烃源岩等有利成藏条件,指出了该区几个主要油气聚集带。杭锦旗地区中元古界在地震剖面上表现为断陷层和坳陷层,二者之间为角度不整合(地震波组T₁₃)。坳陷层夹白云岩的特点可与露头区的中元古界蓟县系对比,覆盖区的断陷层的时代为贺兰山的长城系,坳陷层则相当于贺兰的蓟县系。断陷层分布局限,主要为扇三角洲粗砂岩、细砾岩局部夹-浅海陆棚灰色泥岩沉积。坳陷层分布广泛,工区内接近边缘相,为扇三角洲杂色砂岩、细砾岩夹褐色泥岩、碳酸盐岩,向西逐渐变为潮坪和开阔台地。杭锦旗地区元古界的砂岩普遍发育。岩性主要为不同粒级的岩屑砂岩、石英砂岩、长石砂岩。孔隙类型主要以残余粒间孔和次生溶孔为主,局部发育裂缝。储层整体属于低孔-低渗、低孔-特低渗型储层。中元古界地层的古构造演化和今构造特征,指示了该区的古构造演化与油气运移路径、方向、聚集和散失的关系。参考了关于该区烃源岩生烃的研究成果,考虑到生储盖等条件,确定了锦3井和石鄂2井连线附近及其北西地区、鄂2井西的地势由陡变缓的转折区带的裂缝储层发育区以及锦13井以东的断裂与断裂交汇处三个有利油气聚集区。更多还原

【Abstract】 Hang Jinqi area is an important exporation area in Ordos Basin. In this area Proterozoic is a new exporation target. Referred to previous work, author traced horizon of T₉、T₁₂、T₁₃、T_g in Hang Jinqi area, and made up apparent-plumb depth maps and deposition thickness maps by using the LandMark workstation. Assuming the deposition thickness is dominated by palaeostructure elevation and subsidence framework, writer analyze Proterozoic palaeostructure feature. On the basis of relationship of palaeostructure evolution and the present structural feature togethered with hydrocarbon migration and accumulation and the source rock, writer pointed out several main oil and gas accumulation zones in Hang Jinqi area.According to the seismic cross section, the Proterozoic group is made up of the fault depression layer and the sag layer in Hang Jinqi area. The relationship of contact is angle disconformity. According to the imbedded dolomitic, the sag layer can be compaired with Jixian system, the fault depression layer can compaired with Changcheng system. The distribution of fault depression layer is restricted. The dominant sediments are greet stone, microconglomerate and partly clip gray clay stone. The sag layer widely distribute. It’s border facies closely. The dominant sediments are variegated sandstone, microconglomerate and partly clip brown clay stone and carbonatite. Westward it turns into tital flat and open platform.The sandstone in Proterozoic group is developed universally. Lithologic character is lithic sandstone, quartz sandstone and feldspar-porphyry sandstone. The type of porosity mainly contains the remain intergranular porosity and the secondary dissolved pore, partly develop fissure. It belongs to the low porosity and low permeability reservoir and low porosity and particularly low permeability reservoir.Proterozoic palaeostructure evolution and the present structural feature indicates the relationship of the palaeostructure evolution and hydrocarbon migration, direction, accumulation and dissipate. Referring to previous work that the hydrocarbon source rock have hydrocarbon-expulsion, and the factor, meanwhile, thought of the conditions of translocating system and source reservoir cap assemblage, author forecasted three oil and gas accumulation zones, which are The west of Shie2 well-block, Shie2-Jin3 well-blocks and Jin13 well-blocks.更多还原