Developing an empirical relation among Young modulus (E) and Uniaxial compressive stress (UCS) in a carbonate gas reservoir with petrophysical and geophysical parameters, using regression analysis
عنوان دوره: نوزدهمین کنفرانس ژئوفیزیک ایران
نویسندگان
1بخش مهندسی اکتشاف نفت
2کارشناس ارشد زمین شناسی
چکیده
As geomechanical testing procedure has cost and time effect and, also in an elastic, isotropic, homogeneous solid the elastic moduli also can be determined from the velocity of compressional waves (Vp) and shear waves (Vs) as well as petrophysical parameters (Zoback M. D., 2007); finding empirical relation in order to calculate elastic parameters could be a key to obtain geomechanical properties of a reservoir. Static Young’s modulus (Esta) and uniaxial compressive strength (UCS) are one of the key parameters in geomechanical study in hydrocarbon reservoirs. These are usually estimated based on the empirical models developed to relate the strength and elastic parameters of the rock to their petrophysical properties. In this article the aim is studying the relation of two geomechanical parameters including Young modulus (E) and Uniaxial compressive stress (UCS) with porosity, density, shear wave velocity and compressional wave velocity; and find the best correlated empirical relations by using of regression method for these parameters in a carbonate gas field in southern of Iran, by using of core lab test data extracts from 5 wells in this field. Result of this study shows that the best correlation for UCS is predicted by porosity (R2≈ 0.7) and for E is predicted by density (R2≈ 0.7)
کلیدواژه ها
 
Title
Developing an empirical relation among Young modulus (E) and Uniaxial compressive stress (UCS) in a carbonate gas reservoir with petrophysical and geophysical parameters, using regression analysis
Authors
misha pezeshki, imandokht Mostafavi, Hassan Eshraghi, amin morshedi pour
Abstract
As geomechanical testing procedure has cost and time effect and, also in an elastic, isotropic, homogeneous solid the elastic moduli also can be determined from the velocity of compressional waves (Vp) and shear waves (Vs) as well as petrophysical parameters (Zoback M. D., 2007); finding empirical relation in order to calculate elastic parameters could be a key to obtain geomechanical properties of a reservoir. Static Young’s modulus (Esta) and uniaxial compressive strength (UCS) are one of the key parameters in geomechanical study in hydrocarbon reservoirs. These are usually estimated based on the empirical models developed to relate the strength and elastic parameters of the rock to their petrophysical properties. In this article the aim is studying the relation of two geomechanical parameters including Young modulus (E) and Uniaxial compressive stress (UCS) with porosity, density, shear wave velocity and compressional wave velocity; and find the best correlated empirical relations by using of regression method for these parameters in a carbonate gas field in southern of Iran, by using of core lab test data extracts from 5 wells in this field. Result of this study shows that the best correlation for UCS is predicted by porosity (R2≈ 0.7) and for E is predicted by density (R2≈ 0.7)
Keywords
geomechanics, Young modulus, uniaxial compressive test, regression, empirical relation, gas reservoir