【摘要】 受地质情况复杂和地震资料分辨率低的限制,对川东北YB地区长兴组礁、滩相储层分布规律的成功研究史例很少。文中以现有的钻井、地质和地震资料为基础,详细描述了该区礁、滩相储集体的沉积特征,分析了弹性参数与储层的含油气关系,搞清了礁、滩相储层的空间展布规律,并得出以下认识:①YB地区台地边缘礁、滩相储层可分为上、下两套储层,上储层以礁盖白云岩为主,下储层以礁后生物滩屑储层及早期生屑滩储层为主。②长兴组含气储层表现为低纵波速度、低弹性模量和低泊松比特征,而不含气储层则相反;随着孔隙度的增高,纵波速度、弹性模量和泊松比都有不同程度的降低。基于储层预测结果部署的针对礁、滩相的钻井大多数都获得了工业气流,长兴组储层段都表现出低泊松比特征,符合Ⅱ、Ⅲ类含气储层的划分依据,储层预测结果与钻井情况吻合较好。更多还原

【Abstract】 Limited by complicated geology conditions and low seismic data resolution,there are only a very few successful study cases for the distribution of Changxin Group reef&beach facies in YB area of Northwest of Sichuan.Based on available drilling data,the geological data and seismic data,the sediment characteristics of the reef-beach facies reservoir in this area were described in detailed,the relation between the elastic parameters and the oil&gas bearing property of the reservoir was analyzed,the spatial distribution of the reef-beach facies were fully understood,and the following conclusions were obtained:(1)There are upper set and lower set of reservoirs for the reef&beach facies reservoir in the margin of the platform in YB area,the upper one is mainly a reef top dolomite,the lower set is mainly consist of the backreef biological beach debris reservoir and the early biological beach debris reservoir;(2)The gas bearing reservoir for Changxin Group shows low P-wave velocity,low elastic modulus and low Passion Ratio,the non-gas bearing reservoir is just opposite,with increase of the porosity,the P-wave velocity,the elastic modulus and Passion Ratio all decrease in different extent.For most wells which were drilled based on the reservoir prediction results industry gas was obtained,the Changxin reservoir sections all show low Passion ratio characteristic,which match the classification basis for first type and second type gas-bearing reservoir.更多还原