Geostatistical reservoir modeling of Fimkassar area, upper Indus basin, Pakistan (T-1552) (MFN 7087)

Abstract

Fimkassar, formerly known as Parhal, field is in southern Potwar on OGDC's Fimkassar concession in Punjab's Chakwal District.The structure is located in southeastern Potwar and has a 23 by 13 km northeast-southwest trending surface expression with vertical closure 1,800-1,900 m. At Eocene level areal extent is 45 sq Ian and vertical closure is 58 m, with an additional 230 m due to vertical fault relief. The basic objective of the study is to get preliminary understanding and know the subsurface structure trend and stratigraphy of the cited area. Seismic interpretation eventually resulted in outcomes as time and depth contour maps, which assisted to understand the subsurface structure for further exploration. Static reservoir modeling is a crucial step in field development studies. The grid developed during the modeling is further used in reservoir simulation studies. Static reservoir model integrate structural, stratigraphic, petrophysical and lithological characteristics into one integrated model. Stratigraphic model is constructed through fine scale stratigraphic well con-elation. Structural model is constructed using interpreted horizons. Stratigraphic and structural models are combined into one gridded model. Petrophysical, lithological and facies models are constructed from detailed petrophysical analysis. Structural, stratigraphic, petrophysical, lithological and facies model is integrated to form field scale static reservoir model using geophysical techniques. Porosity, water saturation and VSH are derived from conventional petro physical analysis. These petrophysical properties are populated in stratigraphic model to construct petrophysical model. Lithology and facies model are analyzed using cluster analysis techniques. Integration of structural, stratigraphic, petrophysical and facies model gives detail information about stratigraphy, petrophysical properties distribution and facies distribution in field.