碳酸盐岩潜山储层预测技术在Kab油田的应用

Application of Carbonate Buried-hill Reservoir in Kab Oilfield

STG盆地Kab油田潜山岩性为碳酸盐岩,裂缝、溶蚀孔洞型储层发育不均,造成潜山含油性及产能存在差异。为完善该油田的开发井网,扩展油藏边界,认清其缝洞型储层的发育特征,从潜山岩心分析入手,通过岩电关系对比、成像测井分析及多种地震预测方法的综合应用,总结出碳酸盐岩测井分类标准,认识到储层有利发育区在地震上表现为同相轴扭动、错断、呈杂乱反射特征,认为断层发育区、断层尖灭端、地层倾角大以及张性应力较大区域裂缝较发育,从而探索出适用于该类型储层预测研究的系统方法。多种方法的综合应用有效解决了制约该油田增储上产的瓶颈,部署的2口井日产油均在60 t/d以上,最高达120 t/d,取得较好效果。研究结果对碳酸盐岩潜山储层预测研究具有一定的借鉴意义。

The carbonate reservoir in Kab Oilfield of STG Basin with non-uniform development of fractures and dissolution caves results in differences in oiliness and productivity. Buried-hill reservoir core analysis is used to improve oilfield development well network,extend reservoir boundary and master the development of fracture-cave reservoirs. The logging classification standard of carbonate is summarized by comprehensively application of rock-electric comparison,imaging logging analysis and various seismic predictions. Research shows that the seismic response of favorable reservoir development area is featured by phase axis twisting,dislocation and chaotic seismic reflection. Fracture is relatively well-developed in the areas with well-developed faults,fault pinch-out side,high dip-angle areas and areas with relatively high tensile stress. An applicable reservoir prediction method is developed for carbonate buried-hill reservoir. This research could provide certain reference for further study on carbonate buried-hill reservoir prediction.