Title: SEISMIC STRATIGRAPHY OF EOCENE-OLIGOCENE CARBONATE-SILICICLASTICS SEQUENCES IN THE NORTH EASTERN PART OF INDUS OFFSHORE AND NEAR BY ONSHORE, PAKISTAN
Name: Shabeer Ahmed
Centre for Pure and Applied Geology, University of Sindh, Jamshoro, Pakistan
The Offshore Indus Basin represents the western part of the trailing edge of the Indian Plate, east of Murray Ridge (Fig-A1). This basin is a typical Atlantic Type Passive Margin developed as a result of the breakup of Gondwana during the Mesozoic. The structural and depositional history of this margin is genetically related to poly-history deformation of the Offshore Indus Basin. As a result distinct structural and stratigraphic features have been developed in this basin, which can be recognized on the seismic data. The integration of seismic and well data for the identification of Eocene (Laki and KirtharFm) and Oligocene (NARI) successions may help in delineating reservoirrock, Seal rock and source rock from petroleum system point of view.Seismic as a tool has been used for the seismic stratigraphic analysis of Eocene(Laki and KirtharFm) and Oligocene (NARI) stratigraphic sequences andstudy of depositional pattern with reference to basin geometry for siliciclastic and carbonates sequences of north eastern part of Indus Offshore and nearby onshore – Pakistan. In total twenty five (25) seismic linesand four wells log data has been used for the identification of Eocene(Laki and KirtharFormations) and Oligocene (Nari Formation) stratigraphic sequences and set of Parasequence from facies, depositional pattern , basin geometry, and interpretation of system tracts. These system tracts deposited stratigraphic features just as progradation, retrogradational, aggradations onlap, downlap, base lap, basin floor fans top lap and maximum flooding surfaces.
Seismic data indicate the presence of Eocene and Oligocene sequence boundaries, as Lowstand system tract (LST), Transgressive system tract (TST) and Highstand system tract (HST) which have been identified and marked on seismic data. Kirthar and Lakilimestone of Eocene age are considered as reservoir rocks equivalent of these is Sui Main Limestone (SML) a proven and producing reservoir on onshore in the middle Indus Basin and the upper part of Kirthar is shaly which may act as seal rock. Whereas Nariof Oligocene age is considered as reservoir rock because Oligocene rocks are producing rock in the most southern part of the Kirthar fold belt area.
Biography
Is a Ph.D Research Scholar form Centre for Pure and Applied Geology, University of Sindh, Jamshoro, Pakistan. He is doing research on tectonic evolution of structures and their hydrocarbon potential in Southern Indus Basin, Pakistan. He did his master inGeophysics from Department of Earth Sciences, Quaid-e-Azam, University, Islamabad. He is active member of by American Association of Petroleum Geoscientists (AAPG) and Society of Exploration Geophysicists (SEG). He also contributed many publications as author and co-author.
Presenting author details
Full name: Shabeer Ahmed
Contact number: 00923003046556
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Sessionname/ number: Exploration Geophysics
Category: Oral presentation