测录井结合快速识别低孔渗储层流体技术

Rapid Identification of Fluid in Low Porosity Low Permeability Reservoir by Combined Well Logging and Mud Logging

摘要: 低孔、低渗储层物性差，孔隙结构复杂，不同的流体性质具有相似的物性、电性特征，增加了油气水层判别难度，以往的解释图版和解释方法已经不能完全满足测井解释的需求。测录井技术综合运用，通过由三种算法组成的交会图技术来识别流体性质及流体类型，解决了常规测井对低孔、低渗储层油气层识别的技术难题，提高了复杂储层烃类、非烃类流体的优快识别准确率和效果。最后，通过30个层段的识别结果与测压取样、试油结果对比，验证了该方法具有较好的应用效果。该技术的运用为低品位油气层勘探开发纵深发展提供技术保障。

Abstract: The reservoirs with low porosity and low permeability are poor in physical properties and com-plex in pore structure, so different fluids in this kind of reservoir have similar physical and pe-trophysical properties, making it difficult to tell oil, gas and water layers from each other. Therefore, previous interpretation charts and methods cannot fully satisfy the well logging demand. Crossplot of three algorithms by using well logging and mug logging data has been developed to identify fluid properties and fluid type. This technology has solved the identification of oil and gas layers with low porosity and low permeability, a difficult problem in conventional well logging, and improved the accuracy and effectiveness of identification of hydrocarbon and nonhydrocarbon fluids in complex reservoirs. Comparison of identification results of 30 intervals with pressure sampling and oil test results prove that the method has a good application effect. The technology provides technical support for the in-depth exploration of low-grade oil and gas layers.