Physical Property Parameters Measured And Research Of Compact Dense Rock Under Formation Conditions

With the development of oil-gas exploration,the complexity of oil and gas reservoirs has increased the difficulty of exploration,and the accuracy requirements for oil and gas reservoir prediction are getting higher and higher.Among the oil and gas resources to be explored,the proportion of conventional reservoirs becomes less.The focus of China's energy exploration is gradually shifted from the original structural oil and gas reservoirs to the exploration of tight reservoirs in lithologic strata.Through basic research and design such as petrophysical experiments,the variation characteristics and related correlations of various physical parameters of rock can be obtained.Establishing a rock physics model suitable for application,transforming seismic data,logging data into lithology data,or quantifying/qualifying the uncertain relationship between data,can provide high reliability theory required for seismic exploration and reservoir oil-gas development which is of great significance to the society.Based on petrophysical theory,this paper uses petrophysical experiments to conduct data analysis and experimental results research,and draws on the previous research results and rock physical properties to study the rock physical properties of shale from a certain industrial area in Zhejiang Oilfield and tight sandstone from Sichuan basin in the southwestern region.The research mainly involves designing rock physics experiments,analyzing experimental results,inverting experimental results,analyzing rock elastic and electrical properties which is affected by rock physical property changes,and studying the effects of temperature and pressure conditions on rock elastic and electrical parameters:1?Under normal temperature-pressure and high temperature-pressure conditions,put shale samples in the hydrostatic pressure system and test the elastic data of shale by Autolab-1000: the P wave velocity and S wave velocity which can help us get the Young's modulus and the Poisson ratio.Analyzed the elastic parameters of shale under reservoir condition,and discussed the influence of pressure on elastic parameters.The result indicate that the different pressure factors make different effects on frequency spectral property.And the increase in pressure will have different effects on shale in different core directions.2?Use the Autolab-1000 and SI1260 to measure the complex resistivity of formationwater-saturated shale samples in room condition and reservoir condition.Process the experiment data by inversion program of double cole-cole model to get the frequency spectral parameters of different samples.Study the effect of temperature and pressure changes on complex resistivity and spectral parameters of rock.The results show that there is a critical point in the process of resistivity decreasing as temperature and pressure increase.After the critical point,the resistivity will start to increase in the opposite direction.3?Measured the complex resistivity of water-saturated compact sandstone sample and limestone sample in room condition by SI1260.It is found that there is a power exponential correspondence between complex resistivity and porosity and permeability of sandstone.There also have a index correspondence between complex resistivity and permeability of limestone.At the same time,based on the KozenyCarman equation,derive the formula for obtaining permeability through resistivity,and verify the feasibility of the formula.Taking the compact sandstone samples as examples,obtain the value range of the compact sandstone cementation index in the resistivity-permeability formula.