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NATURAL AND DRILLING INDUCED FACTORS INFLUENCING THE BRITTLENESS ESTIMATION BASED ON SONIC LOGS
Abstract
Proper estimation of geomechanical parameters of the shale gas reservoir has a crucial influence on the stimulation treatments designing and therefore on hydrocarbon production from unconventional reservoir. The brittleness is the most commonly used parameter for locating the geomechanical hotspots in the reservoir. This parameter can be estimated using elastic, dynamic rock properties such as Poisson Ratio and Young Modulus obtained from sonic logs. The seismic waves velocities recorded by the sonic logging tool are influenced by various factors such as fracture occurrence, hydrocarbon saturation, breakouts and washouts structures occurrence. The paper presents identification of the logs parts disturbed by different factors. Fractures, breakouts and washouts were observed using the X-tended Range Micro Imager (XRMI) tool and the hydrocarbon content was obtained from geochemical logs. Elimination of invalid logs sections allowed for more accurate evaluation of geomechanical potential for hydraulic fracturing. Presented research was performed for selected well located in the Baltic Basin which is the subject of the extended shale gas/oil exploration surveys.
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References10
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