鲕滩储层气-水识别因子的构建与应用

Construction and application of gas-water identification factor of oolitic-beach reservoirConstruction and application of gas-water identification factor of oolitic-beach reservoir

(成都理工大学“油气藏地质与开发工程”国家重点实验室,四川成都610059)

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China

在Russell流体识别因子的理论基础上,构建了新的气-水识别因子。利用气-识别因子判断鲕滩储层含气性的步骤是：首先确定目标,即寻找含气鲕滩储层和含水围岩的地震属性差异;然后通过叠前纵、横波阻抗同时反演获得ρ,ZP和ZS等参数,利用这些参数计算全工区的气-水识别因子;最后,利用得到的识别因子和其它参数的交会分析,获得鲕滩储层的含气性显示。结合川东北鲕滩储层的地质、地球物理特征和测井数据对构建的各种流体识别因子的识别能力进行分析,其中流体识别因子ρf／Z2S和纵波阻抗的交会结果与井资料的吻合程度较好,可很好地刻画出鲕滩储层的有利含气区域,且较好地去掉了背景值,减少了识别误差。

On the basis of the theory of Russell′s fluid identification factor,a new gas-water identification factor was constructed.Then the new identification factor was used to identify the gas-bearing area of carbonate oolitic-beach reservoir.Firstly,the target is identified,that is to find the contrast in the seismic attributes of gas-bearing oolitic-beach reservoir and water filled surrounding rock.Secondly,some parameters,including,and,are obtained by simultaneous inversion of P-wave and S-wave impedance,which are adopted to calculate the gas-water identification factor of the whole area.Finally,cross analysis is carried out on the new identification factor and other parameters,to obtain the gas-bearing display of oolitic-beach reservoir.Combining the geologic and geophysical characteristics with logging data of oolitic-beach reservoir in Northeast Sichuan Basin,we analyzed the identification ability of all fluid identification factors,which indicates that the cross analysis result of ρf／Z2S and impedance is matched well with well data,has good characterization ability of favorable gas-bearing area,well removes background value and decrease identification error.