Acoustic logging and density logging are the ripe and
conventional techniques for gas finding. The differential ratio
between gas layer’s and pure water layer ’s logging data
which based on the core porosity can be used to identify gas
layer. This can improve data reliable. This method has simple
principal , easy to operate and have good effect on
identification of gas layer in tight sand , upper Palaeozonic
Era ,Daniudi gas field ,Ordos basin.
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