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鄂尔多斯盆地西部奥陶系古油藏油源对比与靖边气田气源
Keywords: 鄂尔多斯盆地,奥陶系,古油藏,油源对比,靖边气田,气源
Abstract:
？岩心观察和镜下薄片鉴定表明，鄂尔多斯盆地奥陶系孔洞缝储集体中普遍存在沥青，平面上主要分布在盆地中西部地区，剖面上主要集中在桌子山组顶—克里摩里组和乌拉力克组。成层富集的沥青揭示出研究区存在3类古油藏:克里摩里组顶部孔洞型、桌子山组顶部孔隙型和乌拉力克组裂隙型。应用生物标志化合物进行油源对比，证实古油藏的油源为盆地西南缘的平凉组海相泥页岩;结合天然气碳同位素、黄金管热模拟实验、构造沉积演化史、成藏史及地质背景研究，认为中央古隆起东西两侧奥陶系储层中天然气的气源岩为平凉组海相泥页岩;侏罗纪—早白垩世，平凉组泥页岩生成的油气向中央古隆起区带运聚形成古油藏;晚侏罗世—古近纪，古油藏裂解生成的天然气向盆地北东方向的构造高部位进行区域性运移，形成群体性潜山风化壳大气田——靖边气田。？
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