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

Yaser SALIMIDELSHAD, Ali MORADZADEH, Ezatallah KAZEMZADEH, Peyman POURAFSHARY, Abbas MAJDI

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)565-575
Number of pages11
JournalPetroleum Exploration and Development
Volume46
Issue number3
DOIs
Publication statusPublished - Jun 1 2019

Keywords

  • carbonate reservoir, CT scan
  • cyclic pressure loading
  • petrophysical property
  • rock physical property
  • structure deformation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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