The existing prediction methods of shale gas content include in situ desorption, logging interpretation, isothermal adsorption, linear fitting, seismic inversion and so on, but each method is deficient in some aspects.A new calculation model of shale gas content in Fuling area is established in this study, laying the foundation for the evaluation of shale resources.Based on the core experiment, the main controlling factors were selected through analyzing the influencing factors of shale free gas content and adsorbed gas content in Fuling area.Then, calculation models of free gas content and adsorbed gas content were established respectively with the integration of the theoretical calculation model and experimental formula to analyze the main controlling factors.Finally, the evolution charts of shale gas content versus porosity, TOC and depth and distribution characteristics of shale gas content in single well in studied area were obtained utilizing the calculation models proposed above.The shale gas content increases with depth when porosity and TOC are constant, but the increment decreases progressively;when the depth is certain, the shale gas content increases with porosity and TOC.The shale gas content of Wufeng Formation and Longmaxi Formation of well A increases with layer depth;the total gas content is up to 7.76m3/t under lower shale reservoir of Member 1, the content of free gas accounted for 60.57%, which indicates high-quality member for shale gas reservoir.
fulingshale gas contentevolutiondistribution characteristicspetroleum geology.
NETL
NSTL
维普
万方数据
