塔中45井区奥陶系成藏期次综合分析

Analysis on Ordovician Hydrocarbon Accumulation Stages in Wellblock Tazhong 45

塔中45井是塔里木盆地塔中Ⅰ号坡折带西段的一口高产油井,其奥陶系油气储层的烃类流体包裹体可分为4期。烃包裹体的储层岩石特征主要为胶结充填作用、交代充填作用、溶蚀作用和破裂作用。烃包裹体类型以气液烃包裹体为主,存在少量的液态烃包裹体、气态烃包裹体以及极少量沥青包裹体。在紫外荧光下,大部分烃包裹体呈蓝白色和黄白色,存在少量的红褐色。通过对塔中45井区烃类包裹体的分析,得出其中烃类包裹体的第Ⅱ期和第Ⅲ期对油气成藏起着主要作用。

Well Tazhong 45 was a high production well in the west of Fault Zone Ⅰ of Tarim Basin,the hydrocarbon fluid inclusion of Ordovician reservoirs could be divided into 4 stages,its reservoir rock properties were mainly of cement filling,metasomasis filling,dissolution and fracturing,the types of inclusion were mainly of gas-liquid hydrocarbon inclusions and small amount of liquid hydrocarbon inclusions,gas hydrocarbon inclusions and few bitumen inclusions.Under ultraluminescence light,most of the inclusions are in blue-white and yellow-white with less of them in sorrel.By analyzing the inclusions from Wellblock Tazhong 45,the result indicates that Stage Ⅱ and Ⅲ of the hydrocarbon inclusions play a major role of hydrocarbon accumulation.