Perm Journal of Petroleum and Mining Engineering (Mar 2016)

Oil-water contact change rules of Bashkirian dome (Upper Devonian-Tournaisian deposits)

  • Daria V. Luzina,
  • Denis V. Potekhin

DOI
https://doi.org/10.15593/2224-9923/2016.18.1
Journal volume & issue
Vol. 15, no. 18
pp. 7 – 15

Abstract

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Oil-water contact (OWC) justification is an important criteria for estimation of reserves and evaluation of deposits potential. The main factors that influence evaluation of hydrocarbon accumulation amount are as following: structural surfaces of reservoir top and bottom, effective thicknesses distribution along the thickness of studying reservoir and fluid contact position. In case first two factors are constant accumulation volume and distribution of oil net pay thicknesses in reservoir are controlled by correctly determined OWC. Determination of OWC position is associated with several challenges and mainly with limited initial data. In this paper regional forecast of OWC position was performed. The target of research was Bashkirian dome (its north end in Perm region). Bashkirian dome represents major characterized tectonic element. Accumulated data were generalized on the deposits of presented oil and gas plays (OGP) and resource analysis was performed. During the analysis of OWC position across the all objects of reserve estimation high uncertainty was determined. Statistical sample was the basis for determination of zonal rules and calculation of statistical model of regional OWC. Obtained regression equations take into account formation and tectonic features of Bashkirian dome, allow performing forecast of fluid contact position for more authentic evaluation of hydrocarbon resources of determined structures and specification of WOC in the reservoirs with relatively evaluated OWC that represent 50% from all deposits. Obtained equations help to determine position of OWC that has high uncertainty. Equations will represent additional basis for OWC justification during re-estimation of reserves and evaluation of resources while field exploration. That will increase geological model authenticity and decrease amount of issues during history matching of hydrodynamic model.

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