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Geochemical characterization of shales of the Eocene Disang Group,Kohima Syncline,India:Inferences to hydrocarbon potential and depositional environment

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Petroleum Research 2021年第1期6卷 42-56页

作者： Mousumi Gogoi neeraj mathur T.Satish Kumar Temsulemba Walling Sarat Phukan Department of Geological Sciences Gauhati UniversityGuwahati781014India R&D Department Oil India Ltd.DuliajanDibrugarh786692India Centre of Excellence for Energy Studies Oil India Ltd.Guwahati781022India Department of Geology Nagaland UniversityKohima797004India

The Kohima Syncline exposes the Eocene Upper Disang Formation in an extensive region that is composed of grey shales with subordinate sandstone and siltstone alterations.The shales contain low to fair amount of organic matters represented by Type IV/Type III terrestrial kerogens.The Biomarkers indicate presence of terrestrial angiosperms and microbially reworked organic matters with some marine phytoplankton.Rock-Eval maturity parameters indicate maturity within a wide range between immature to post mature wet gas window,while the biomarkers show maturity between immature to mid mature.The biomarkers indicate that the Disang shales deposited in an oxic deltaic-terrigenous environment.The trace elements characterize an oxic to suboxic warm and humid depositional environment.Few trace elements point to deposition in a low salinity continental rather than a marine environment.Thus,several biomarker and trace element parameters show that a continental milieu was already established during the deposition of the Upper Disang sediments.It indicates that either the Disang basin,that evolved as a marine basin,suffered rapid shallowing during the deposition of the Upper Disang sediments,or the Lower and Upper Disangs were coeval and Lower Disangs represented deep marine facies while the Upper Disangs represented peripheral shallow marine deltaic facies.Maturity parameters like Tmax and,sterane and hopane isomerization ratios indicate that the organic matters of the Disang Group were affected by sudden short duration thermal events followed by cooling.This is possible in an active tectonic region like the Kohima Syncline that bears many evidences of thrusting and folding.

关键词： Carbonaceous shale Disang group Rock-eval pyrolysis Biomarkers Trace elements Hydrocarbon potential Depositional environment

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A study on assessment of hydrocarbon potential of the lignite deposits of Saurashtra basin, Gujarat （Western India）

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International Journal of Coal Science & Technology 2017年第4期4卷 310-321页

作者： Prakash K. Singh V. K. Singh P. K. Rajak neeraj mathur Coal and Organic Petrology Lab Centre of Advanced Studyin Geology Banaras Hindu University VaranasiUttar Pradesh 221005 India Centre of Excellence for Energy Studies Oil India LimitedRukminigaon GS Road Guwahati Assam 781022 India

In the present investigation, Bhavnagar lignites of the Saurashtra basin (Gujarat) have been studied to assess their hydrocarbon generating potential. The samples of upper as well as lower lignite seams have been studied through microscopy and subjected to various chemical analyses viz. proximate analysis, ultimate analysis and Rock-Eval Pyrolysis. These lignites have high moisture and low to moderate ash yield but are characterized by high volatile matter. Petrographically they comprise predominantly of huminite group maceral while liptinite and inertinite groups occur in subordinated amount. Huminite is chiefly composed of detrohuminite and telohuminite. The T max (av. 416.23 °C) and huminite reflectivity (0.28%–0.30%) indicate a low degree of maturity for these lignites which is also substantiated by the T max versus hydrogen index plot. The organic matter is subjugated by kerogen Type-III with a potential to expel hydrocarbon on liquefaction. Study further reveals that the fixed hydrocarbon is several folds higher than the free hydrocarbons. Being high in reactive maceral content, a high ‘conversion’ and good ‘oil yield’ values for these lignites were observed. Thus, the empirically derived values match well with those obtained through the experimental values of Rock-Eval Pyrolysis and validate their hydrocarbon generating potential.

关键词： Saurashtra lignite Reactive maceral Rock-Eval Hydrocarbon generating potential

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Socio-economic, Environmental and Health Aspects of Farm Workers Engaged in Mango Plantations

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Biomedical and Environmental Sciences 1995年第4期8卷 301-309页

作者： B. N. GUPTA neeraj mathur S. K. RASTOGI A. K. SRIVASTAVA H. CHANDRA, B. S. PANGTEY P. N. MAHENDRA AND R. S. BHARTI(Epidemiotogy Division, Industrial Toxicology Research Centre,Lucknow, India) Epidemiology Division Industrial Toxicology Research Centre Lucknow India.

A cross-sectional survey of 489 male subjects in the age group 15 to 65 years engageddirectly or indirectly in mango cultivation along with 208 control subjects was carried out to find their socio-economic, environmental and health conditions. The conditions like high illiteracy rate (49.5%), poverty (PCI less than Rs 100 per month, 52.2%), poor housing (mud houses, 66.7%) unsafe water supply (78.6%) were prevailing in the surveyed population. The high respiratory morbidity may be attributed to high prevalence of smoking andprolonged inhalation of organic dusts during farming operation associated with illiteracyand poor socio-economic status. Gastrointestinal disorders were related to poor hygienic conditions, smoking and consumption of contaminated water. The symptoms pertaining to CNS, skin and eyes were found to be associated with exposure to pesticides

关键词： In Environmental and Health Aspects of Farm Workers Engaged in Mango Plantations

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