EVALUATION OF HYDROCARBON POTENTIAL AND GEOCELLULAR MODELING OF MINWAL-JOYAMAIR FIELDS, UPPER INDUS BASIN, PAKISTAN

Abstract

Upper Indus Basin has been a valuable asset as the complexity of structure and hydrocarbon production is the leading producer for oil and gas in history and still to date. Potwar Sub-Basin of Eastern Potwar has significance in the light of oil production from carbonate reservoirs or Eocene and Permian age and Cambrian reservoirs. The complexity is present for carbonate reservoirs of Eocene (Chorgali, Sakesar, and Lockhart formations) due to heterogeneity of lithological and facies variation. Researchers suggested advanced methods for further hydrocarbon potential evaluation, but no detailed work has been done for any conclusion. Apart from all the above difficulties, Eastern Potwar’s fields are the leading producers for hydrocarbon production. Minwal-Joyamair fields as one of the old fields present in Eastern Potwar which is adjacent to many producing fields as Balkassar, Adhi, Chaknaurang, Pindori and Turkwal, etc. Minwal-Joyamair Field is very significant which has unique hydrocarbon production history with complexity in stratigraphy and structure. This research's primary focus to analyze field potential and reservoir characterization by conventional seismic interpretation and petrophysical analysis and advance seismic methods (seismic attributes and rock physics). Seismic interpretation of 2D seismic data, which helps to understand the subsurface structural geometry. Minwal-Joyamair field is a combination of thrust and back thrust, forming a triangle zone in the subsurface. Field production of heavy oil is mainly from Eocene and Paleocene carbonate reservoirs but the value of the remaining reserves is high. Advanced exploration techniques have to be carried out to increase oil and gas production in the field. In this research, the emphasis is integrated advance seismic and well data for Eocene (Chorgali, Sakesar) and Paleocene (Lockhart) reservoirs. Furthermore, the evaluation was done for the Cambrian reservoir was also presented. Cambrian reservoirs, an enhanced oil recovery method are also presented which can help increase production and stimulation of formation sands. Apart from the availability of data completevi geocellular model of the field has been produced, encompasses and the petrophysical and facies model. Source rock potential of Patala Formation (i.e. proven source of hydrocarbon) was also calculated, which helps in understanding the petroleum system present in Eastern Potwar and also for the unconventional reservoir potential of shales present.