塔河地区卡拉沙依组小层划分、连通性及油藏类型

Subzone division,connectivity and pool types of the Carboniferous Kalashayi Formation in the Tahe area

盛湘 何发岐 云露

Sheng Xiang He Faqi Yun Lou

塔河油田石炭系卡拉沙依组油层主要分布在卡三段和卡四段的砂泥岩互层中,根据钙质含量引起的电阻率和自然伽马测井曲线变化和旋回特征将卡三、四段进一步自上而下分为Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴ油组。各油组厚度一般在80～100m之间,油组界线在连井地震剖面上均标定在同一个同相轴上,因而具等时性。油气层的较薄的单层厚度(2～5m)和河道微相类型决定了其在横向上多为不连通的透镜状砂体。油气藏类型多为受构造圈闭和透镜状砂体分布以及连通寒武奥陶系烃源岩的断层的共同控制。

The oil layers in the Carboniferous Kalashayi Formation (K) in the Tahe oilfield mainly occur in the interbedded sandstones and mudstones of K3 and K4 members. Based on the variability and cyclicity of resistivity and Gamma ray logs caused by calcareous contents in mudstones,K3 and K4 members were subdivided,from top to bottom,into five reservoir units:Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ.The thickness of each unit ranges from 80 m to 100 m and the boundaries of each unit were calibrated to the same event on well-tie seismic profile,thus being isochronal.Most of the oil and gas layers appear laterally as separated lenticular sandbodies for their thin single layer(2～5 m)and channel microfacies.The pools are mainly controlled by structural traps,distribution of lenticular sandbodies and faults seated in the Cambrian and Ordovician source rocks.

10.11743/ogg20090203