卡1-顺西地区碳酸盐岩储层响应特征及有利勘探部位优选

The Response Characteristics of Carbonate Reservoir and Favorable Exploration Areas of Hydrocarbon Accumulation in Ka1-ShunXi area

卡1-顺西地区是重要的油气勘探潜力区,钻井表明该区油水关系复杂,优质储层钻遇难度大,油气成藏控制因素及规律不明。通过对研究区已钻井统计分析,建立储层综合评价标准,开展储层充填物影响因素和正演模拟分析,明确储层地震响应特征。通过实钻井储层发育特征、油气钻遇情况与盖层、构造、断裂的关系分析,研究高效井油气成藏控制因素。结果表明,强反射异常是卡1-顺西地区碳酸盐岩储层的地震响应特征,"串珠"、"短板"是规模储集体的甜点,裂缝型储层形成的杂乱反射响应特征是重要的储层目标类型,但部署需慎重。断裂带附近储层发育,有利于油气富集,断裂带周围1 km范围内可能是最有利的勘探区域,断裂带两侧封闭的规模储集体高点是最有可能的高效井甜点。研究结果为卡1-顺西地区碳酸盐岩后期勘探提高储层和油气钻遇率奠定了坚实基础。

The Ordovician formation in Ka1-ShunXi area has been regarded as the focus layer for breakthrough in oil and gas exploration.Based on the statistical analysis of some wells,the comprehensive reservoir evaluation criteria are established.Combined with the affecting analysis of reservoir filling and forward modeling,the response characteristics of carbonate reservoir in Ka1-ShunXi area is clear.Through the analysis of drilling wells reservoir development characteristics and relationship between oil and gas situation of cap,structure and fault,the authors analyzed main control factors of hydrocarbon accumulation in Ka1-ShunXi area.Some conclusions have been reached:strong reflection is the response characteristics of carbonate reservoir in the area;“beaded”and“short board”shapes are the favorable place where the reservoirs existed;messy reflection response characteristics caused by fractured reservoirs is an important reservoir target type,but exploration must be careful.In Ka1-ShunXi area,the reservoir development and hydrocarbon accumulation are effected by fault zone,the one kilometer range within the fault zone maybe the most favorable exploration area,and the high points of scale reservoir on both sides of fault zone is most likely efficient wells dessert.The achievement has laid a solid foundation on improving drilling rate of carbonate reservoir and oil&gas in Ka1-ShunXi area.