页岩有机质体积含量:概念、测试方法及意义OA北大核心CSTPCD

Total Organic Content is an essential index for evaluating the oil and gas production capacity of shale,which has an impact on porosity and gas content and is also a key parameter for evaluating the"geological sweet spot"of shale reservoir.However,TOC cannot reflect the distribution,connectivity,spatial proportion of organic matter and its influence on oil and gas flow and reservoir transformation.Through data sorting and analysis,the concept of Organic Volume Proportion was clarified and gave and analyzed the advantages and disadvantages of five calculation methods,including the formula method,scanning electron microscopy estimation method,CT scanning method,low-field NMR measurement method,and rock physics model method.The significance of organic matter volume content to developing organic-rich shale oil and gas is also discussed.The Organic Volume Proportion refers to the volume of organic matter per unit volume of shale.It is expressed as a percentage,which strengthens the importance of organic pores in shale gas reservoir evaluation and development,and enriches the evaluation parameter system of shale oil and gas reservoirs.Organic matter is the weak structural point or weak structural plane of shale,the characteristics of OVP bridge the geological sweet spot and engineering sweet spot indicators,the solubility and spatial proportion of organic matter lay the foundation for the new idea of"removal material and increment permeability"in oil and gas reservoirs.When organic matter is taken as the object of dissolution,a small amount of organic matter dissolution will greatly increase the reservoir reconstruction volume.