Integration of Seismic and Seismological Data Interpretation for Subsurface Structure Identification

Authors: Iftikhar Ahmed Satti, Wan Ismail Wan Yusoff

Abstract:

The structural interpretation of a part of eastern Potwar (Missa Keswal) has been carried out with available seismological, seismic and well data. Seismological data contains both the source parameters and fault plane solution (FPS) parameters and seismic data contains ten seismic lines that were re-interpreted by using well data. Structural interpretation depicts two broad types of fault sets namely, thrust and back thrust faults. These faults together give rise to pop up structures in the study area and also responsible for many structural traps and seismicity. Seismic interpretation includes time and depth contour maps of Chorgali Formation while seismological interpretation includes focal mechanism solution (FMS), depth, frequency, magnitude bar graphs and renewal of Seismotectonic map. The Focal Mechanism Solutions (FMS) that surrounds the study area are correlated with the different geological and structural maps of the area for the determination of the nature of subsurface faults. Results of structural interpretation from both seismic and seismological data show good correlation. It is hoped that the present work will help in better understanding of the variations in the subsurface structure and can be a useful tool for earthquake prediction, planning of oil field and reservoir monitoring.

Keywords: Focal mechanism solution (FMS), Fault plane solution (FPS), Reservoir monitoring, earthquake prediction.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1084744

References:

[1] Aamir, M and Siddiqui, M.M., 2006, "Interpretation and Visualization of Thrust Sheets in a Triangle Zone in Eastern Potwar, Pakistan". The Leading Edge. P.24 ~37
[2] Kemal, A., 1991, "Geology and new trends for petroleum exploration in Pakistan", PAPG Bulletin, p.16~ 57.
[3] Moghal, M. A. & Hameed, A., et al, 2003, "Subsurface Geometry of Potwar Sub-Basin in Relation to Structuration and Entrapment" ATC 2003 Conference Proceedings: P. 1~14.
[4] MonaLisa, Khan, S.A and Khawaja, A.A. 2004, "Focal Mechanism Study of North Potwar Deformed Zone, Pakistan", Acta Seismological Sinica, Vol. 17no.3, P.255~261.
[5] Wandrey, C.J, Law, B.E. & Shah, H.A. 1999" Patala-Nammal Composite Total Petroleum System, Kohat-Potwar Geologic Province, Pakistan" U.S. Geological Survey Bulletin 2208-B: P. 1~26.