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Experimental investigation of changes in petrophysical properties and structural deformation of carbonate reservoirs

查看全文 作　　者：SALIMIDELSHAD [1]Yaser;MORADZADEH [1]Ali;KAZEMZADEH [2]Ezatallah;POURAFSHARY [3]Peyman;MAJDI [1]Abbas 高影响力作者 机构地区：[1]School of Mining Engineering, College of Engineering, University of Tehran, Tehran 1417614418, Iran;[2]Faculty of Research and Development in Upstream Petroleum Industry, Research Institute of Petroleum Industry, Tehran 1485733111, Iran;[3]Department of Petroleum Engineering, School of Mining and Geosciences, Nazarbayev University, Astana 010000, Kazakhstan高影响力机构 出　　处：《Petroleum Exploration and Development》索引2019年第46卷第3期,共11页高影响力期刊 摘　　要：To examine the effect of pressure on pore structure and petrophysical properties of carbonate rock, the porosity, permeability, CT scanning, SEM and elastic wave velocity of two carbonate core plug samples from an oilfield in Southwest Iran were analyzed under cyclic pressure. One of the plugs was calcite and the other was dolomite with anhydrite nodules. The cyclic pressure exerted on the samples increased from 13.79 MPa to 27.58 MPa in six steps, and the variations in petrophysical properties of the two samples at different pressure loading and unloading steps were counted and analyzed. The results show that the calcite sample decreases in porosity and permeability with the increase of pressure, which is consistent with the results from compression and shear wave velocity tests. In the dolomite sample, the decreasing trend was not observed;fluctuations of compressive and shear velocities were observed during the loading stage, which may be due to different geometries of the pores and the porosity variation in the sample. Understanding the variation of carbonate petrophysical properties with pressure is helpful for optimizing reservoir development scheme. 关 键 词：CYCLIC pressure loading petrophysical PROPERTY CARBONATE reservoir, CT SCAN rock physical PROPERTY structure deformation
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