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Bhattacharya, N.
- Clay Mineralogy and Trace Element Geochemistry of Subathu, Dharmsala and Siwalik Sediments in Himalayan Foothills of Northwest India
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Authors
Affiliations
1 Institute of Petroleum Exploration, Oil & Natural Gas Commission, Dehra Dun, IN
1 Institute of Petroleum Exploration, Oil & Natural Gas Commission, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 11, No 4 (1970), Pagination: 309-332Abstract
265 analyses from 108 selected samples of Subathu, Dharmsala and Siwalik sediments by X-ray diffraction, emission spectroscopy, flame spectrophotometry and gamma ray spectrography are presented in this report. Dominant clay minerals of the Subathu, Dharmsala and Siwalik sediments are respectively moderately degraded illite and chlorite; degraded illite, vermiculite and expandable mixed-layers; and montmorillonite, kaolinite and highly degraded illite/chlorite. Trace and minor elements in clays are divided into non-detrital diadochic substitutions (B, Ba, Sr, Ga, Sc, Zn, Ge and Pb) and detrital elements as diadochic impurities (Be, P, Mn, Cu, Mo, W, Zr and V). Distribution of Li, Na, K, Rb and Cs and that of U and Th seem to be related primarily to weathering in source areas. It appears that mineralogy and crystal chemistry of clay minerals have dominating influence in selective geochemical partition of trace elements.- Corrensite from the Sirban Limestone of Riasi Jammu and Kashmir State, India
Abstract Views :199 |
PDF Views:128
Authors
Affiliations
1 Institute of Petroleum Exploration, Dehra Dun, IN
1 Institute of Petroleum Exploration, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 14, No 2 (1973), Pagination: 193-196Abstract
No Abstract.- Girujan Clays of Upper Assam-Marine or Continental?
Abstract Views :183 |
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Authors
Affiliations
1 Institute of Petroleum Exploration, Oil and Natural Gas Commission, Dehradun, U. P., IN
1 Institute of Petroleum Exploration, Oil and Natural Gas Commission, Dehradun, U. P., IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 21, No 3 (1980), Pagination: 154-157Abstract
The clays are generally rich in montmorillonite, kaolinite, expandable mixed-layers and degraded illite. Laboratory data indicate two types of sections depending on response of clay minerals to potassium saturation. A partially truncated weathering profile developed under continental conditions is suggested.- Clay Mineral Studies of Barail and Tipam Reservoir Sands in Assam, India
Abstract Views :214 |
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Authors
Affiliations
1 Institute of Petroleum Exploration, Oil and Natural Gas Commission, Kaulagarh, Dehra Dun, IN
1 Institute of Petroleum Exploration, Oil and Natural Gas Commission, Kaulagarh, Dehra Dun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 2 (1984), Pagination: 108-115Abstract
Studies by X-ray diffraction and scanning electron microscopy of the matrix material from these sands indicated that both allogenic and authigenic clays are present in the reservoir. Matrix of Barail sands are characterized by illite, chlorite and kaolinite which have undergone pronounced diagenetic changes. Montmorillonite and expandable mixed-layers are important clay minerals associated with reservoir sands belonging to the Tipam series. Grains, pores and channels are all heavily coated with expandable clays in Tipam sands; the grains, pores and pore throats are partially coated with matrix clays in Barail sands with rare development of bridges in permeability channels.Barail sands were deposited in a transitional environment (deltaic/estuarine) while the environment of deposition was fluviatile for the Tipams. Clay minerals in the Tipam sands are very sensitive to formation damage while those in the Barails could result in permeability barriers if the particles are dislodged in the sands. Accordingly, precise control of salinity of formation water in steps during production and development is suggested.
- Provenance Control of Diagenesis in Clayey Sediments in the Northern Part of Western Continental Shelf of India
Abstract Views :188 |
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Authors
Affiliations
1 Sedimentology Laboratory, Institute of Petroleum Exploration, Oil and Natural Gas Commission, Dehradun, IN
1 Sedimentology Laboratory, Institute of Petroleum Exploration, Oil and Natural Gas Commission, Dehradun, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 7 (1984), Pagination: 427-436Abstract
Recent marine sediments coupled with sea-bottom cores, parting shales and insoluble clay residues of carbonate reservoirs in northeastern continental shelf of the Arabian Sea were investigated for studies of clay mineral diagenesis to evaluate respective roles of source conditions and environment of deposition. The material was also compared with those from selected weathering profiles on basalts and/or diabases. The data indicate an uniform distribution of montmorillonite and expandable mixed-layers with little kaolinite over the continental shelf diluted by sporadic occurrences of degraded illite and chlorite off the Saurashtra coast and beyond in the north and northwest upto the international boundary. These clays were derived by weathering from basalts/diabases and so have not responded to diagenetic changes even at depth. Occurrence of illite and chlorite mixed with montmorillonite and expandable mixed-layers could have resulted from material brought in by the Indus river. The factors of source and inheritance seem to have been the governing criteria for structural failure of these clays against diagenetic processes. However, clay mineral diagenesis indicates that hydrocarbons discovered in this area are independent of the associated clay mineral characters with regard to their genesis and entrapment.- Clay Mineral Distribution of Dharmsala Sediments in Northwest India
Abstract Views :188 |
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Authors
Affiliations
1 Institute of Petroleum Exploration and Directorate of Geology, Oil & Natural Gas Commission, Dehra Dun, IN
1 Institute of Petroleum Exploration and Directorate of Geology, Oil & Natural Gas Commission, Dehra Dun, IN