川东北通江-南江-巴中地区嘉陵江组二段白云岩储层预测研究

南方海相碳酸盐岩的油气勘探潜力很大,白云岩是重要的碳酸盐岩储层类型,其储集空间类型复杂多样.通江-南江-巴中地区(简称通南巴地区)嘉二段白云岩以砂屑白云岩为主,发育多种溶孔、溶洞和多种裂缝,已钻井揭示了良好的油气前景,但因其时代较老、埋藏深、烃源岩差、保存条件差和储层条件差等,其储层预测和油气检测难度很大.本文以目标区三维地震资料为基础,在对储层的岩石物理、地质地震特征进行分析的基础上,利用应力应变分析、体相干、多方位地震裂缝预测、频率衰减梯度分析等技术对白云岩目标产气层进行了深入研究,预测出了目标层的裂缝发育区、孔洞发育区,并对流体分布情况进行了预测探讨.

Dolomite Reservoir Prediction in the Jialingjiang No.2 Member of the Tongnanba Area, Northeast of the Sichuan Basin, China

Dolomite in the Jia2 Member of the Tongnanba area is mainly doloarenite,where growth many types of dissolved pore,cavern and fracture.The drilled wells show favorable gas-oil prospect,but the member is so old,deep and has bad reservoir conditions that make reservoir prediction and hydrocarbon detection is difficult.In this paper,the target dolomite stratum is lucubrated by stress-strain analyze,volume coherence technique,multi-azimuth prediction of fracture,frequency attenuation gradient analyse based on the 3D seismic data of the area.The fracture and cave has been predicted.The fluid distribution has been forecasted.