Comparison of the physical and geotechnical properties of gas-hydrate-bearing sediments from offshore India and other gas-hydrate-reservoir systems

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doi: 10.1016/j.marpetgeo.2014.07.024
Author(s): Winters, W. J.; Wilcox-Cline, R. W.; Long, P.; Dewri, S. K.; Kumar, P.; Stern, L.; Kerr, L.
Indian National Gass Hydrate Program Expedition 01 Scientsts
Author Affiliation(s): Primary:
U. S. Geological Survey, Woods Hole, MA, United States
Lawrence Berkeley National Laboratory, United States
Oil and Natural Gas Corporation, India
Marine Biological Laboratory, United States
Volume Title: Geologic implications of gas hydrates in the offshore of India; results of the National Gas Hydrate Program Expedition 01
Volume Author(s): Ramana, M. V., editor; Ramprasad, T.; Collett, Timothy S.; Kumar, P.; Boswell, Ray M.; Riedel, Michael; Sathe, Arun Vasant; Lall, M.; Vishwanath, Krishna; Mazumdar, A.; Sain, Kalachand; Cochran, James R.
Source: Geologic implications of gas hydrates in the offshore of India; results of the National Gas Hydrate Program Expedition 01, edited by M. V. Ramana, T. Ramprasad, Timothy S. Collett, P. Kumar, Ray M. Boswell, Michael Riedel, Arun Vasant Sathe, M. Lall, Krishna Vishwanath, A. Mazumdar, Kalachand Sain and James R. Cochran; Indian National Gass Hydrate Program Expedition 01 Scientsts. Marine and Petroleum Geology, 58( Part A), p.139-167. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0264-8172
Note: In English. 125 refs.; illus., incl. 10 tables, sketch maps
Summary: The sediment characteristics of hydrate-bearing reservoirs profoundly affect the formation, distribution, and morphology of gas hydrate. The presence and type of gas, porewater chemistry, fluid migration, and subbottom temperature may govern the hydrate formation process, but it is the host sediment that commonly dictates final hydrate habit, and whether hydrate may be economically developed. In this paper, the physical properties of hydrate-bearing regions offshore eastern India (Krishna-Godavari and Mahanadi Basins) and the Andaman Islands, determined from Expedition NGHP-01 cores, are compared to each other, well logs, and published results of other hydrate reservoirs. Properties from the hydrate-free Kerala-Konkan basin off the west coast of India are also presented. Coarser-grained reservoirs (permafrost-related and marine) may contain high gas-hydrate-pore saturations, while finer-grained reservoirs may contain low-saturation disseminated or more complex gas-hydrates, including nodules, layers, and high-angle planar and rotational veins. However, even in these fine-grained sediments, gas hydrate preferentially forms in coarser sediment or fractures, when present. The presence of hydrate in conjunction with other geologic processes may be responsible for sediment porosity being nearly uniform for almost 500 m off the Andaman Islands. Properties of individual NGHP-01 wells and regional trends are discussed in detail. However, comparison of marine and permafrost-related Arctic reservoirs provides insight into the inter-relationships and common traits between physical properties and the morphology of gas-hydrate reservoirs regardless of location. Extrapolation of properties from one location to another also enhances our understanding of gas-hydrate reservoir systems. Grain size and porosity effects on permeability are critical, both locally to trap gas and regionally to provide fluid flow to hydrate reservoirs. Index properties corroborate more advanced consolidation and triaxial strength test results and can be used for predicting behavior in other NGHP-01 regions. Pseudo-overconsolidation is present near the seafloor and is underlain by underconsolidation at depth at some NGHP-01 locations. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 29 Economic Geology, Energy Sources; Alaska; Andaman Sea; Asia; Atlantic Ocean; Atterberg limits; Bay of Bengal; Blake-Bahama Outer Ridge; Canada; Cascadia subduction zone; Case studies; Consolidation; Cores; East Pacific; Eastern India; Electron microscopy data; Expedition 311; Gas hydrates; Grain size; Gulf of Mexico; Hydrate Ridge; India; Indian Ocean; Indian Peninsula; Integrated Ocean Drilling Program; Krishna-Godavari Basin; Leg 204; Mahanadi Basin; Marine sediments; North Atlantic; North Pacific; North Slope; Northeast Pacific; Northwest Territories; Ocean Drilling Program; Pacific Ocean; Permafrost; Permeability; Physical properties; SEM data; Sediments; Shear strength; Soil mechanics; Thermal conductivity; Triaxial tests; United States; Well logs; Western Canada
Coordinates: N483700 N484800 W1264000 W1270400
N150000 N173000 E0840000 E0783000
Record ID: 2016097418
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands