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| Figure 4. Subsurface pressures measured in gas wells in the Port Neches Field and North Port Neches Field, Tex. (unpub. data from Fred Wang, University of Texas at Austin, Bureau of Economic Geology, 2001). Low subsurface pressures like those graphed can lead to increased overburden stress, compaction of the strata, reactivation of faults, and land-surface subsidence. Depths are in feet and meters; pressures are in pounds per square inch and megapascals. |
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