页岩含气量理论图版

doi:10.11743/ogg20150220

Abstract

Abstract: Shale gas content is composed of free gas contentand adsorbed gas content.The free gas content may be inf-luenced by porosity,gas saturation,density,pressure and temperature,whilethe adsorbed gas content is affected by organic carbon content,organic matter maturity,pressure and temperature.The adsorption capacities of organic matters of diffe-rent types(adsorption/TOC)of shale are quite different,and show the sequence of Ⅲ>Ⅱ>Ⅰ.Thus,different formulas were proposed for the calculation of free gas content and adsorbed gas content.Through analyzing and selecting the key factors for shale gas content,and based on relational theoretical calculations,charts of shale gas content were developed for different organic matter types,so as to quickly and accurately calculate shale gas content.Overall,shale gas content increases with depth,but the increment decreases progressively.The theoretical values calculated with the charts correlate well with the field measured values,indicating the wide applicability of these charts.The theoretical shale gas content obtained with these charts can provide a reliable basis for the reasonable evaluation of shale gas resource potential and prediction of play fairways in the early stage of shale gas exploration when the available geologic parameters are rare.

Key words: chart, free gas, adsorbed gas, organic matter type, shale gas

CLC Number:

TE122.1

Xue Bing, Zhang Jinchuan, Yang Chao, Zhang Peng, Pei Songwei. Theoretical chart of shale gas content[J]. Oil & Gas Geology, 2015, 36(2): 339-346.

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Theoretical chart of shale gas content

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