塔里木盆地塔中地区奥陶系碳酸盐岩储层裂缝发育特征与测井响应

塔中地区是塔里木盆地内具有较高勘探程度和较大开发潜力的地区之一,特别是该地区奥陶系碳酸盐岩地层中裂缝较为发育,储集性能较好。对该地区奥陶系中碳酸盐岩裂缝产出特征及如何识别进行研究,对预测储层物性和指导油气勘探具有重要意义。根据该地区钻达奥陶系钻井的实测岩心、常规测井及成像测井等资料,识别和统计多种裂缝,研究该地区碳酸盐岩裂缝发育特征及测井响应标志。结果表明,该地区奥陶系碳酸盐岩岩层中,竖直裂缝和高角度裂缝的数量较多,大多为构造缝,裂缝以小缝为主,其中约有45%～55%的裂缝为有效裂缝。双侧向测井、声波测井、密度测井和成像测井对裂缝有着较好的特征响应,用测井手段进行裂缝预测收到了良好效果。在实际应用中,应当注意通过数据的综合处理消除干扰因素和多解性。

Fracture Development Characteristics and Logging Response of the Ordovician Carbonate Reservoir in Tazhong Area of Tarim Basin

Tazhong area is one of high-degree exploration and large-potential areas in Tarim Basin,and the fractures developed well and reservoir properties are good especially in the Ordovician carbonate formations.Therefore,development characteristics and identification evaluation on the fractures of Ordovician carbonate rocks have important significance for oil and gas exploration and of reservoir prediction.According to the drilled cores and data of conventional logging and imaging logging,many kinds of fractures are recognized and counted,and characteristics of fracture development and logging response markers are researched.The result shows that the Ordovician carbonate reservoirs have more vertical fractures and high angle fractures,belongs to structural fractures with small scale.There are about 45%-55% fractures are effective.Dual lateral logging,acoustic logging,density logging and imaging logging have a good characteristics response in the fractures,and good effect for fracture prediction has received.In the actual application,interference factor and ambiguity should be removed through integrated processing of the information.