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自然伽马测井测量岩石自然放射性,反映岩石的矿物成分、沉积环境。从研究砂砾岩母岩性质、沉积特征入手,将岩矿分析资料与自然伽马测井曲线进行对比分析,对东营凹陷陡坡带砂砾岩放射性及自然伽马测井响应特征进行了研究。结果表明,砂砾岩为近物源沉积,保留了母岩的放射性特征,母岩为花岗片麻岩的砂砾岩钾(40K)含量高,放射性强,自然伽马读数高,而且自然伽马读数与砂砾岩的粒径和成熟度密切相关。母岩为碳酸盐岩的砂砾岩放射性较弱,自然伽马读数主要取决于岩石中的泥质含量。根据研究结果,利用自然伽马测量值,定性识别砂砾岩岩性,判断砂砾岩成熟度,划分沉积旋回,进行地层对比分层,在砂砾岩勘探中取得了好的效果;同时提出,对于母岩为花岗片麻岩的砂砾岩,用自然伽马测井资料计算地层泥质含量是不适宜的。
Natural gamma ray logging measures the natural radioactivity of rocks, reflecting the mineral composition and sedimentary environment of the rock. Starting from studying the characteristics and sedimentary characteristics of gravel rock, analyzing the data of rock and mine analysis and the gamma ray logging curve, the response characteristics of radioactivity and gamma ray logging of steep slope glutenite in Dongying Sag were studied. The results show that glutenite is a near-provenance sediment, retaining the radioactive characteristics of the parent rock. The conglomerate of the granitic gneiss is composed of high content of potassium (40K), strong radioactivity, high natural gamma readings, and natural gamma ray The readings are closely related to the grain size and maturity of glutenite. Radioactive conglomerates with a parent rock of carbonate rocks are weakly radioactive, and gamma ray readings depend mainly on the shale content of the rock. According to the research results, the natural gamma ray is used to qualitatively identify the lithology of glutenite, to determine the maturity of glutenite, to divide the sedimentary cycles, to stratify and stratify the strata, and to obtain good results in the glutenite exploration. At the same time, The rock is conglomerate of granitic gneiss. Calculating the muddy content of the formation by using gamma ray logging data is not suitable.