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Empirical rock physics relationships on carbonate dry-frame elastic properties

Petroleum Science 2021年第3期18卷 783-806页

作者： Zi-Zhen Wang gautier njiekak Douglas RSchmitt Rui-He Wang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266555China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266555China Department of Physics University of AlbertaEdmontonCanada Department of Earth Atmosphericand Planetary SciencePurdue UniversityWest LafayetteUSA

Laboratory tests were conducted to analyze the ultrasonic velocity response to the pressure change in dry carbonate rocks from the Weyburn oilfield,***-four samples are from seven wells with helium porosities ranging from 1%to 29%.Thin-section images,SEM and mercury intrusion porosimetry were performed to show their inner structures and pore throat size distributions.P-and S-wave velocities(V_(p) and V_(s))measurements were first done under hydrostatic loading and then while unloading,with confining pressures varying between 3 and 35 *** results indicate that V_(p) and V_(s) in these samples follow a linear relation independent of the pressure *** ratio V_(p)/V_(s) is more responsive to pressure change irrespective of the pore ***-third of the carbonate samples show abnormal V_(p)/V_(s) reduction with the increase in the effective *** pressure dependence of velocities(PDV)of Weyburn carbonate rocks varies widely even for samples from the same formation with similar sedimentary *** with loosely packed crystals and/or relatively large dominant pore diameter have higher *** exponential empirical model V=A−Ce^(DPe) was tested;therein,V is the elastic wave velocity,Pe is the effective confining pressure,and A,C and D are the best fitting coefficients determined by curve *** model gives good fits for most of the Weyburn carbonate *** a statistical point of view,there is no difference between the V_(p)-and V_(s)-derived exponential coefficient D.

关键词： Velocity Carbonate rocks Pressure dependence Pore structure

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