塔里木盆地塔中地区奥陶系关键不整合性质论证及其对储层的影响

利用塔中地区钻井、地震和岩心资料,结合合成地震记录、VSP资料,证实了T47和T07为复合性界面,在塔中的不同区带性质不同,大致可分为岩性界面、等时界面和岩性等时界面3类。不同性质的不整合面,其地震反射特征、不整合面上、下地层的结接型式、岩性构成都有所不同,则对储层有着不同的控制和影响作用。而T47不整合面下岩溶型储层正是塔中油气勘探的重要目标。

Demonstration on Key Ordovician Unconformity of Tazhong Area in Tarim Basin and Its Influence on Reservoirs

By using the drilling,seismic and core data from Tazhong area,and in combination with seismogram,VSP data,it is proven that T41 and T07 are composite interfaces,they are of different properties in different intervals in Tazhong area,which can be divided into 3 types,such as lithologic interface,chronohorizon and lithologic-chronohorizon,unconformable surfaces of different property are different in seismic reflection character and continuity and the strata both below and above the unconformable surface and in lithologic composition as well,which has different effects of control ling and influences on reservoirs,while karst reservoirs below the T47 unconformable surface is an important target for hydrocarbon exploration in Tazhong area.