Formation evaluation and rock physics analysis for shale gas reservoir - A case study from China South

Important properties to consider in shale-gas evaluation include minerals, total organic content (TOC), brittleness index, minimum closure pressure, fracture pressure and some mechanical rock properties which can assess the gas potential and fracturability for a shale gas reservoir. We often not have enough measured data to completely characterize the shale properties of interest. Meanwhile, determine the relationship among the reservoir properties and the elastic properties is important for the reservoir evaluation and prediction, especially in the reservoir prediction using the seismic data. This paper calculated the multiminerals, TOC, brittleness index, minimum closure pressure, fracture pressure based on the conventional log data. Furthermore, rock physics analysis is employed to analyze the relationship among minerals, TOC, brittleness, minimum closure pressure and elastic properties. The evaluation and prediction result in a well of Jiannan area in Southern China prove the appropriate of the methods.