裂隙介质中变化井径的井孔声波测井响应数值模拟

为了研究井径变化对储层声波测井响应的影响，基于Hudson裂隙理论建立了裂隙介质井孔模型，分别考虑水层(饱水裂隙)和油层(饱油裂隙)两种情况进行井孔声波测井正演数值模拟，并通过改变井径大小和裂隙参数(裂隙角度、裂隙密度)来模拟分析全波列声波测井响应的变化特征。模拟结果表明，在变化井径的条件下，随着裂隙参数的变化，声波在油层和水层中的响应各有不同且具一定规律性，据此可在一定程度上区分油、水层。研究取得的认识可为变化井径的裂隙储层声波测井资料解释提供有参考价值的指导性建议。

To study the impact of variable borehole diameter on acoustic logging,the fractureed media borehole model is built.In terms of water layer (oil-saturated fractures) and oil layer (oil-saturated fractures) borehole acoustic logging are simulated by changing borehole diameter and fracture parameters (fracture density and fracture angle).The variation characteristics of full wavetrain acoustic logging responses is simulated and analyzed.The simulation results indicate that as the fracture parameters changes,acoustic amplitude in oil and water layers displays different responses and shows certain regularity with variable borehole diameter.In terms of the results,water and oil layers can be distinguished to some degree.Thereby,the recognition can provide guidance for logging interpretation in the actual fractured reservoir.