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Identification of reservoir units and their petrophysical characterization with special reference to Mesozoic formations, Kachchh offshore basin, Western India

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Abstract

Kachchh offshore basin is a petroliferous basin with evidences of good hydrocarbon prospectivity in Mesozoic and Tertiary sedimentary layers. Exploration began after discovery of commercial quantities of both liquid and gaseous hydrocarbon. Offshore part of the Kachchh-Saurashtra basin forms the northern part of western offshore basin of India. It is a pericratonic rift basin which came into existence during the breakup of India from Africa. The Kachchh offshore is characterized by dominantly NNW-SSE striking faults. The rift evolution and synrift sedimentation continued through the Jurassic and Cretaceous time and subsequently into passive margin setup during Late Paleocene–Early Eocene time with the formation of self-slope setup. The offshore Kachchh basin has a dual petroleum system; a Mesozoic–Mesozoic petroleum system and a Mesozoic–Tertiary petroleum system with good source and reservoir facies. In the present study, the focus was on the portrayal of Tertiary and Mesozoic sequences in terms of petrophysical characterization, core data integration vis-à-vis depositional environment depiction using advanced well log data. The sediment thickness of the Mesozoic is maximum in this graben. Probing these shallow as well as deeper prospects within Tertiary and Mesozoic sequences of Gulf of Kachchh may open up new areas for exploration. In offshore areas, hydrocarbon prospectivity is mainly governed by structural/stratigraphic entrapment of sedimentary layers developed in Tertiary and Mesozoic ages. Hydrocarbon occurrences are found as small localized pools in most of the stratigraphic units, which makes a comprehensive understanding of depositional systems a prerequisite for exploration and more challenging in offshore areas.

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Acknowledgements

Authors JDD and VKA gratefully acknowledge support from the ONGC, and BGD gratefully acknowledges support provided by the PDPU.

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Correspondence to Bhawanisingh G. Desai.

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Jyotsna, G.D.D., Desai, B.G. & Lakshmi Narayan Avadhani, V. Identification of reservoir units and their petrophysical characterization with special reference to Mesozoic formations, Kachchh offshore basin, Western India. Arab J Geosci 15, 917 (2022). https://doi.org/10.1007/s12517-022-10162-x

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