The gamma ray index is usually computed from a well log such as a gamma ray log.
自然伽马指数通常由自然伽马或其它测井曲线计算得到。
For some sandstone reservoirs with high natural gamma ray existed in Ordos Basin, it is difficult to be correctly identified and to calculate its shale content with gamma ray log only.
对鄂尔多斯盆地存在的高自然伽马砂岩储层，仅用自然伽马测井资料难以正确识别并计算其泥质含量。
Based on the features of mudstone with higher gamma ray than sandstone in sandstone -mudstone section, we can distinguish sandstone reservoir from the drilling profiles with gamma ray log.
在砂泥岩剖面中，泥岩往往比砂岩具有较高的自然伽马值，从而可以利用自然伽马测井将砂岩储层划分出来。
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