Analysis And Numerical Simulation Of Influencing Factors Of Shale Thermal Conductivity

Although China has already formed a set of effective means in the production process of reservoir exploration and development.However,for deep underground reservoirs,our research methods are still very limited.We only indirectly judge reservoir information through some physical parameters,and make the reservoir description more accurate by enriching physical parameters,but the thermal physical parameters of rock are used as reservoir pore,permeability,saturation,etc.The closely related physical quantities of parameters are ignored.Thermal physical parameters of shale are not only closely related to the exploration and development of oil and gas,but also control the evolution process of hydrocarbons.Therefore,the study of thermophysical parameters is also conducive to hydrocarbon accumulation and interpretation.Thermal conductivity is the most important parameter to characterize the thermophysical properties of rocks.Its size is affected by many factors.Petrological characteristics are the most important ones.Porosity,fluid-containing properties,and acoustic properties are also closely related to it.Affected by temperature,pressure,and anisotropy.Therefore,starting from the thermal conductivity,we studied the oil shale in the Longmaxi Formation in southeastern SiChuan,and measured the thermal conductivity of 52 rock samples.The factors that affect the thermal conductivity were taken as independent variables.There is a good linear relationship between the same thermal conductivity,except for siliceous.And through the comparison of the degree of fit and the multi-factor analysis method,the most important factor affecting the thermal conductivity is found—temperature.At the same time,further studies have found that the effect of temperature on thermal conductivity is of a dual nature.That is,for a material with a lower thermal conductivity at room temperature,increasing the temperature will increase the thermal conductivity of the material,while for a material with a larger thermal conductivity,the heating will increase.It will reduce its thermal conductivity.After studying the relationship between the thermal conductivity and the seven factors of shale mineral composition,porosity,and temperature,we use a multivariate linear fitting to obtain the thermal conductivity calculation formula for different temperatures.In order to study the change in thermal conductivity under the condition of the original stratum,we simulated the actual rock samples using the finite element method and verified the reliability of the model through comparison.The next step is to discuss the thermal coupling of thermal conductivity and simulate the formation of the original stratum.The foundation.