Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Identification of Stratigraphic Play potential within Jalangi Formation using High Resolution Sequence Stratigraphy in the Shelfal part of Bengal Basin, India Pinaki Basu*, H.S.Vachak, Kumar Vivek, A.Sai Kumar & Dr. Harilal GEOPIC, ONGC Ltd. India basupinaki72@gmail.com GEOPIC, ONGC Ltd, Dehradun 1 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Scheme Of Presentation Introduction Geology Background Present study Conclusions GEOPIC, ONGC Ltd, Dehradun 2 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Location map and area of study in Bengal Onland Basin Bengal basin, a polycyclic basin, has evolved through two distinct tectonic episodes. It was initiated as an intra-cratonic rifted basin within Gondwanaland. This phase of basin development ended with wide spread volcanism during which continental flood basalts (Rajmahal Trap with intratrappeans) covered the Gondwana grabens and surrounding highs. GEOPIC, ONGC Ltd, Dehradun 3 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Tectonic Map of Bengal Basin Second phase of basin formation took place when Indian Craton separated out completely from Antarctica/Australia around 128 Ma and kept on moving northwards. During this journey of the Indian plate, the pericratonic part on the eastern margin (along with Gondwana sediments) continuously subsided and received colossal volume of sediments from Late Cretaceous through Tertiary to Recent times in a passive margin set-up. GEOPIC, ONGC Ltd, Dehradun 4 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Ghatal Fm. GEOPIC, ONGC Ltd, Dehradun 5 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Regional Geological Cross Section across Bengal Basin (Source: Public domain) GEOPIC, ONGC Ltd, Dehradun 6 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Petroleum system: Bengal Basin Gondwana Petroleum System Paleogene Petroleum System GEOPIC, ONGC Ltd, Dehradun 7 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Regionally correlated horizons GEOPIC, ONGC Ltd, Dehradun 8 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Zone of Interest on Seismic section GEOPIC, ONGC Ltd, Dehradun 9 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 RMS amplitude attribute map corresponding to 100ms window below Feature2_top Horizon showing high amplitude elongated features /geobodies aligned parallel to the paleo coastline. GEOPIC, ONGC Ltd, Dehradun 10 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Sweetness attribute map corresponding to 100ms window below Feature2_top Horizon showing high sweetness elongated features /geobodies aligned parallel to the paleo coastline. GEOPIC, ONGC Ltd, Dehradun 11 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 RGB Blending of the geobody 15(R)Hz 20 (G)Hz 25 (B)Hz) RGB blending done at level of 20ms below F2_Top horizon GEOPIC, ONGC Ltd, Dehradun 12 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Impedance section showing the low impedance geobody within the Paleocene Fm. Jalangi Fm.Top Ghatal Fm.Top GEOPIC, ONGC Ltd, Dehradun 13 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Methodology adopted for High Resolution Sequence Stratigraphy and identification of Stratigraphic plays A high resolution seismic chronostratigraphy approach was adapted to assess the geometric relationships of depositional cycles and lithologic associations of these geobodies in response to relative sea-level changes. A 3D seismic chronostratigraphy cube was built to interactively assess the basin history through the Paleocene sequence of Bengal Shelfal part, to assess the varied stratal architectures of the sequence. The main step entailed seismic interpretation using closely spaced semi automatically generated seismic horizons from seismic reflection data. The auto tracked seismic horizons were further used to carry out 3D “Wheeler transformation” . GEOPIC, ONGC Ltd, Dehradun 14 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Seismic section showing the Correlated Horizons Jalangi Fm.Top Ghatal Fm.Top Feature_2 Top GEOPIC, ONGC Ltd, Dehradun 15 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Inline showing the Truncated Horizons Jalangi Fm.Top Ghatal Fm.Top Feature_2 Top GEOPIC, ONGC Ltd, Dehradun 16 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 High resolution Horizon Cube and Wheeler transform generated on Inline in 3D vol. The stratigraphic features are best understood when studied simultaneously in the “Wheeler domain” and in the depositional /structural domain. This integrated technique represents a unique methodology for exploration of stratigraphic traps. GEOPIC, ONGC Ltd, Dehradun 17 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Identified isolated geobodies close to shelf edge Land ward Basin ward GEOPIC, ONGC Ltd, Dehradun 18 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Relief Map showing Barrier Bar and Tidal Inlet complex Clastic deposition in a Marginal Marine env. (Source: Public domain) GEOPIC, ONGC Ltd, Dehradun 19 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Systems Tracts Study on Seismic line (IL948). GEOPIC, ONGC Ltd, Dehradun 20 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Wheeler Similarity showing the Barrier Bar complex Tidal Inlet Tidal Inlet Zoomed part GEOPIC, ONGC Ltd, Dehradun 21 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Model for Transgressive Barrier Bar complex GEOPIC, ONGC Ltd, Dehradun 22 12/5/2017
Oil and Gas Resources of India: Exploration and Production Opportunities and Challenges Geosciences Technology Workshop; Mumbai, India, 6-7 December 2017 Conclusions These strike aligned geobodies mapped within the Jalangi Fm. are wide spread along the paleo shelf margin in Bengal Basin Deposited during a transgressive-regressive sea level cycle. Thick marine shale packages, with thin coal seams were deposited in the shelfal part. Jalangi Formation shale has good source rock enrichment over the entire shelf part and possess greatest potential for oil generation in Bengal Basin. Hydrocarbon generation within this sequence is likely to charge these intricately associated stratigraphic features/ geo-bodies which act as good reservoirs thus enhancing the stratigraphic play potential. GEOPIC, ONGC Ltd, Dehradun 23 12/5/2017
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