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The writer suggests that a method is available to Gulf Coast operators for detecting the proximity of high-pressure fluid reservoirs. Use of this method may avoid costly blowouts or saltwater flows. Mud logging companies have reported that the presence of high background gas and high trip gas, together with lower than normal shale density, may signify the proximity of a high-pressure fluid reservoir. The writer, however, found that in many areas low-density shales are not accompanied by other background gas or trip gas. Even the presence of low-density shale and low resistivity on an electric log does not indicate the proximity of such a high-pressure fluid reservoir. What the writer has found is that a minimum increase of 200 percent in the shale penetration rate indicat s that a high-pressure fluid reservoir is nearby.
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