The paper discusses a petrophysical evaluation method for complex tight gas formations in a mature and partially depleted gas condensate field in Oman, allowing a full petrophyscial evaluation as well as geomechanical modeling from a source-less petrophysical dataset, thus reducing operational data acquisition risk in partially depleted reservoirs without compromising on hydraulic fracturing design. The developed methodology includes the volume of shale estimation from correlation with Poisson's ratio for the feldspathic rich tight formation.

This methodology was used in deep tight fields in Oman for more than 3 years in both vertical and highly deviated wells greatly reducing the risk, logging cost and complexity of operations.

Keywords:
better hydraulic fracture strategy, source-less evaluation modeling, well logging, spectral gamma ray, shale, Density Neutron, travel time, log analysis, compressional wave, gamma ray
Subjects:
Formation Evaluation & Management, Open hole/cased hole log analysis
Copyright 2019, Society of Petroleum Engineers
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