论文部分内容阅读
由于低电阻率油气层的电阻率低于或接近邻近水层的电阻率,降低了利用电阻率识别油气层和水层的分辨率,给测井解释带来较大的难度。青海柴达木盆地第四系涩北气田的储层岩性主要是含泥粉砂岩、粉砂岩和泥质粉砂岩。为了利用测井等资料评价第四系低阻气层,文章在分析和研究测井曲线、岩心分析资料的基础上,提取水层、气层测井曲线以及储层物性特征,剖析了低阻气层最主要原因是储层亲水且较高束缚水饱和度和高地层水矿化度的综合反映。
Because the resistivity of the low resistivity hydrocarbon layer is lower or near the resistivity of the adjacent water layer, the resolution of using the resistivity to identify the oil and gas layers and the water layer is reduced, which brings great difficulty to log interpretation. The reservoir lithology of the Quaternary Sebei gas field in Qinghai Qaidam Basin is mainly muddy siltstone, siltstone and muddy siltstone. In order to evaluate the Quaternary low-resistivity gas reservoirs by logging data, the paper extracts the logging curves of the water and gas reservoirs and the physical properties of the reservoirs on the basis of analyzing and studying the logging curves and core analysis data. The most important reason for the gas layer is the comprehensive reflection of the hydrophilic and higher irreducible water saturation of the reservoir and the salinity of the formation water.