自然电位、自然伽马测井曲线在文15块的应用

Application of self-potential and gamma ray logging curves in Block Wen 15

自然电位(SP)、自然伽马(GR)测井曲线形态和特征与沉积相带及其储集砂体关系密切,它们对不同水动力条件造成的不同环境下的沉积层序在粒度、分选、泥质含量等方面特征响应十分敏感。利用自然电位、自然伽马同步减小的较大幅度评价识别渗砂层,划分有利的骨架砂体沉积微相带;利用自然电位、自然伽马减小的幅度差评价识别低渗砂、致密砂层,划分河道堤泛沉积微相带;并以自然电位比自然伽马减小幅度的相对差异识别油水层。文15块沙三上层段自然电位、自然伽马曲线划分沉积相带及储层的应用,它们在不同储集相带都有明显的异常显示,采用自然电位、自然伽马异常曲线建立起评价划分储层的下限标准,有效地评价划分出油层、水层及致密砂层类型。特别是它们在井内测量岩层中自然存在,测量和获取测井曲线的方法技术简单、成本低廉。因而,在划分和研究沉积相带及储层分布中广泛使用。

The curve shape and characteristics of self-potential and gamma ray logging curves have close relations with sedimentary facies and reservoir rocks. They are very sensitive to the grain grade, sorting and shale content of sedimentary sequences at different sedimentary environment caused by different hydrodynamics condition. Using the evaluation of reductive amplitude difference of self-potential and gamma ray logging, the penetrative sandstone layers were identified, the favorable sandbody sedimentary micro- facies belts were divided, the low and tight penetrative sandstone layers were identified, the channel flank sedimentary micro-facies belts and the oil -water layers were divided. The lower limitation standard of reservoir was established to divide reservoir through the reservoir application of self-potential and gamma ray in Block Wen 15, having obvious abnormal indication in different sedimentm＇y micro-facies belts. Based on this, the oil-water layers and tight sand layers were effectively divided. The method of measuring and acquiring logging curve is very sample and cheap. Thus, it was widely applied in the division and research of sedimentary micro-facies and reservoir distribution.