Abstract
Ditch-gas readings have been sampled through two Upper Cretaceous sandstone zones in 19 wells within and near the McMullin Ranch field in order to define the gas-show pattern associated with a California (Sacramento Valley) dry-gas field. Contour maps of the ditch-gas means for each zone show that the Blewett 5 and upper Tracy sandstone iso-gas-show lines have essentially the same configuration as the structural geometry of the trapping anticlinal fold. This study indicates that an exploratory well could be drilled close to a gas accumulation without detecting the accumulation. At McMullin Ranch (50 billion cu ft gas reserve) the zero gas line is perhaps only 1,000 ft from the gas-water contact of the field. Drilling distribution, mud properties, and penetration rates are considered in relation to the gas-show pattern and are tabulated for comparative purposes.
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