Study On Physical Characteristics Of Chang 6 Reservoir In WL Well Area Of Ordos Basin

Based on the WL block of Ordos basin as the study area,the exploration and development degree is low,so this paper makes a comprehensive and systematic study on reservoir physical properties in the study area,in order to provide a more reliable basis for the prediction of subsequent favorable areas,the calculation of reserves and even the effective development.On the basis of the basic geological research,the basic characteristics of the reservoir,especially the measured physical properties of the reservoir,are analyzed.The pore types of sandstone are mainly 1.57%,followed by 0.78%,and the average face rate is 2.3%.The measured porosity is between 1.8~14.9%,the average porosity is 9.95% the main frequency is 8.0~14.0%.The distribution m D,main frequency(0.2~1.5)m D;reservoir type is ultra-low permeability Class IV a,pore throat combination for small pore fine throat;coefficient of variation 0.95,penetration coefficient 5.27,extreme difference 105.84,homogenization coefficient 0.36,so the intra-layer heterogeneity is strong heterogeneity.The interpretation model of reservoir physical property logging is established by using Ciflog software.Finally,the model with the highest correlation coefficient is selected for verification.The correlation between measured porosity and model calculated porosity R2=0.85,and the correlation between measured permeability and model calculated permeability R2=0.87 Furthermore,the distribution of reservoir physical properties in the study area is studied.The distribution of the data is more uniform,the correlation between the data and the thickness is good.the linoleate group had the best physical properties long 61,long 63 slightly stronger than long 62,and long 64 had the worst physical properties.the average calculated porosity(%)was 9.96(long 61)>9.74(long 63)>9.63(long 62)>9.39(long 64).the average calculated permeability(m D)was 0.6(long 61)>0.53(long 63)>0.50(long62)>0.49(long 64).By integrating relevant data,the main influencing factors of reservoir physical properties in this area are sedimentation,diagenesis and pore structure characteristics: the smaller the ?value of reservoir sandstone is,the larger the grain size is,the higher the material value is usually;the rigid component and permeability of reservoir sandstone are positive correlation,the plastic component and pore permeability are negative correlation;and the sedimentary microfacies are positively correlated with physical properties,the larger the sand-to-ground ratio is,the better the physical properties are.Compaction and dissolution of reservoir have serious damage to primary pore;cementation of reservoir chlorite has optimization effect on physical property;correlation R2 between chlorite content and porosity and permeability are0.20 and 0.64,respectively have direct uplift,feldspar content and porosity,permeability correlation R2 of 0.74 and 0.50,respectively.the displacement pressure,median pressure andreservoir physical properties are negatively correlated,the correlation coefficient is very small;median radius,separation coefficient,homogenization coefficient,pore structure coefficient,maximum mercury saturation and mercury removal efficiency are positively correlated with reservoir physical properties,but the correlation coefficient is not high.