A Study On The Influence Of Micro-pore Structure For Shale Gas Adsorption

With the rapid development of the world economy,conventional oil and gas reservoirs have been unable to satisfy the current needs,so it is more important for exploration and development of unconventional oil and gas reservoirs.Shale gas as an important part of unconventional gas reservoirs,has received widespread attention.We will get the relationship between micro-pore structure and adsorption capacity of shale gas from the experiment,which can be used to guide the exploitation of shale gas.The paper take the Pengshui block shale in Sichuan basin as the research obj ect,using X-Ray diffraction analyzer and geochemistry analysis analyzed the mineral composition,TOC content and maturity of shale;using BET adsorption method and high-pressure mercury injection quantitative express to micro-pore structure,specific surface area and pore volume;Using Argon-ion milled and emission scanning microcopy analyzed the types of reservoir space of shale sample;Using isothermal adsorption experiment of shale to obtain the adsorption quantity of different particle sizes,TOC and temperature;Using Langmuir monolayer adsorption model,D-A micro-pore filling model and L-F model to fit the shale adsorption results,and explore the model that suitable to describe the shale adsorption in the Pengshui block.Combining the micro-pore structure of shale with the isothermal adsorption experiment,study on the influence of micro-pore structure for shale gas adsorption,among them,TOC content,maturity,mineral composition,pore volume and specific surface area can be attributed to the influence of shale micro-pore structure for adsorption capacity of shale;Establishing a model that related to the micro-pore structure parameters of shale-DA-LF model;Analyzing the influence of other factors for shale adsorption.