Recent advances in logging technology have enabled development of a better rock model and better fracture design for low-permeability reservoirs. The new measurements also have improved in-situ analysis and the identification of productive zones that might otherwise be bypassed.

Sonic waveform and magnetic resonance technology enhances the standard logging platform by providing a more accurate shear modulus and permeability estimate. The accuracy is necessary for a better dimensional fracture model. The model appears reasonable for completions in the Olmos and San Miguel sands in south Texas. In some cases the magnetic resonance has identified previously bypassed permeable streaks that increased production. In other cases, sonic waveform technology has helped determine fracture direction, thereby enhancing gas drainage and well placement.

In this paper, field production results are correlated to the model. Less efficient designs based on minimal data are compared with designs having more complete data sets. Recent completion data confirm that better parameters can be obtained with the new measurements.

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