naa a22 4500 510755070 CHVBK 20180411083119.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12594-013-0099-2 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0099-2 Subcrop Gondwana of Bengal basin and their reservoir characteristics [Elektronische Daten] [B. Banerjee, I. Marak, A. Biswas] In Bengal basin the subcrop Gondwana sediments occur in N-S trending elongated grabens originated largely by the graben forming tectonisms of the Gondwanaland which overlie the crystalline basement in the sub-surface in an intra-cratonic setup. So far five wells in shelf part of Bengal Basin have penetrated Gondwana sediments, out of which three wells i.e.,G1, G3 and G2 have been drilled up to Precambrian basement. In subcrop Gondwana graben, glacial to glacio-fluvial Talchir Formation of Early Permian age was deposited above the basement. Early Permian Barakar Formation overlies Talchir Formaion. Flood basin model of deposition is postulated for this coal rich unit. In the absence of Barren Measure Formation, coal bearing Raniganj Formation overlies Barakar Formation. The fluvial set up changed over to arid environment during deposition of Panchet/Supra Panchet Formation (undifferentiated). The deposition of Panchet Formation is followed by eruption of doleritic rocks in both subcrop and outcrop Bengal Gondwana whereas lamprophyres are absent in subcrop of Bengal Gondwana. Rifting as well as pull-apart basin model due to transtensional movement is postulated for Gondwana basins. Detailed lithostratigraphic analysis of the core / cutting samples of the Gondwana sediments reveal that the sediments are mainly fine to coarse grained, poorly sorted sandstone. These sediments are characterized as poor reservoir and needs some treatment for permeability enhancement for hydrocarbon production. Geological Society of India, 2013 Gondwana sediments nationallicence Reservoir characteristics nationallicence Bengal basin nationallicence Banerjee B. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut Marak I. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut Biswas A. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 741-754 0016-7622 81:6<741 2013 81 12594 https://doi.org/10.1007/s12594-013-0099-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0099-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Banerjee B. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut NATIONALLICENCE 700 1- Marak I. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut NATIONALLICENCE 700 1- Biswas A. ONGC MBA Basin, P32, Transport Depot Road, 700 088, Kolkata, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/6(2013-06-01), 741-754 0016-7622 81:6<741 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer