TITLE:
Modeling of Land Subsidence in the South Pars Gas Field (Iran)
AUTHORS:
Mohammad Hossein Taherynia, Seyed Mahmoud Fatemi Aghda, Akbar Ghazifard
KEYWORDS:
Subsidence; South Pars; Compressibility; Reservoir Rock; Analytical Method; Semi-Analytical Method
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.7,
September
16,
2013
ABSTRACT: The objective of this study is to predict the
subsidence of the South Pars gas field at the end of production period. With respect
to the notable reservoir thickness, significant pressure drop due to extraction
and high areal extent of the South Pars gas field there is a high subsidence
potential in this field. In order to determinate the maximum land subsidence
and subsidence profile of the South Pars gas field, at first, the reservoir
compaction was estimated based on the thickness of the reservoir, the pressure
drop in the reservoir and the uniaxial compaction coefficient of the reservoir
rock, and then the effect of the reservoir compaction on the field
surface was modeled with the use of analytical and semi-numerical methods. The
compaction of the reservoir at the end of production period was estimated to be
about 0.48 m. Both of the subsidence
modeling methods show similar results and predict that the maximum subsidence
will reach about 0.6 m at
the end of production period.