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Discussion on determination methods of gas content in shale reserves
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Key Words:Discussion on determination methods of gas content in shale reserves
Abstract:shale gas content is not only a critical parameter for shale gas resource evaluation and favorable areas optimization, but also an important evaluation criterion for shale mining value. Accesses to obtain shale gas content have been introduced, one is determining desorpted gas, residual gas and the loss gas according to desorption method, the other is calculating adsorbed gas content and free gas content separately using isothermal adsorption experiment and log interpretation. In conculsion, the measurement results by desorption method may be easily affected by coring, measurement methods, the calculation method of loss gas, gas resolving temperature and other factors, and the total gas content by calculation is closer to the true value than the indirect method. Estimates of adsorbed gas content need to consider organic carbon content, clay mineral composition, maturity, temperature, pressure and other factors on shale adsorption ability, building appropriate calculation model on adsorbed gas content, the key of free gas content estimation is to determine the effective porosity and gas saturation of shale reserves. Building up some testing technology and isothermal adsorption experiment standard for shale gas, quantifying the impact of various controlling factors on shale gas have great significance on accurate assessment of shale gas content.
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