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根据显微镜下烃包裹体的荧光特征、与方解石脉的穿插关系以及均一温度等特征,将塔中Ⅰ号坡折带奥陶系储层中发育的烃包裹体划分为4个期次;结合塔中地区区域构造演化特点,研究区四期烃包裹体分别对应着4个油气成藏期次,即志留纪末低成熟油形成时期,海西晚期生油期,早喜马拉雅期凝析油-湿气形成期,喜马拉雅期后期干气阶段。这4期烃包裹体在塔中Ⅰ号带奥陶系储层中具有明显的分带性,由东南浅埋藏油区向西北深埋油区将塔中Ⅰ号带奥陶系储层包裹体分布情况分成4个区域,其中第Ⅲ,Ⅳ期烃包裹体古油对现在油气藏起决定作用。
According to the fluorescence characteristics of hydrocarbon inclusions under microscope, the interpenetration relationship with the calcite veins and the uniform temperature, the hydrocarbon inclusions developed in Ordovician reservoir in Tazhong Ⅰ slope break zone are divided into four periods. In the study area, the hydrocarbon inclusions in the fourth phase correspond to four hydrocarbon accumulation stages, that is, the formation of low mature oil at the end of Silurian, the oil generation in the Hercynian period, the condensation of oil and gas in the early Himalayan period, Moisture formation period, late Himalayan dry period. These four hydrocarbon inclusions show obvious zonation in Ordovician reservoir of Tazhong Ⅰ belt. From the shallow southeast Tibetan oil region to the northwestern deep-buried oil region, the Ordovician reservoir inclusions in Tazhong Ⅰ belt Distribution is divided into four regions, of which Ⅲ, Ⅳ hydrocarbon inclusions ancient oil plays a decisive role in the current oil and gas reservoirs.