Deformational style and hydrocarbons trapping mechanism of the sub Himalayan frontal ranges near Fateh Jhang, Punjab, Pakistan
Keywords:
Seismic interpretation, Sub-Himalayas, 3D modeling, Deformational style, Bhal Sayedan anticline, Hydrocarbons trapping mechanismAbstract
This research targets the Fateh Jang area, part of Sub-Himalayan Frontal Ranges in the foothills of Main Boundary Thrust (MBT) Fault in the Upper Indus Basin, Pakistan. The purpose of this research is to interpret the deformational style using the 2D seismic data to delineate the hydrocarbons trapping mechanism developed in response to the crustal adjustments due to the crustal deformation by the Himalayan Orogeny. Subsurface structural geology of Bhal Sayedan oil field is interpreted by using eight 2D seismic line data and formation tops data from well Bhal Sayedan-02. The 2 D seismic lines were interpreted to reveal the 3 D subsurface structure of the Bhal Sayedan area in the software MOVE (2D & 3D). Seismic interpretation in 2 D reveals that the Bhal Sayedan area consists of fold and thrust geometry and general trend of the thrust faults is northeast-southwest due to southeast northwest compressive stresses. The Bhal Sayedan area shows an average crustal shortening of ~3900m along the two south verging blind thrust faults namely Ajjuwala thrust fault (throw 550m) and Jafar thrust fault (throw 400m) by bringing the Eocene rocks over the Miocene rocks. The 3D model reveals that the Bhal Sayedan anticline is a fault propagation fold lying between the Ajjuwala and Jafar thrust faults and hence has four way closure making it an ideal target for the hydrocarbons trapping.
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