Geoelectric investigations in Bakreswar geothermal area, West Bengal, India

Majumdar, R. K.; Majumdar, N.; Mukherjee, A. L.

doi:10.1016/s0926-9851(00)00028-8

Cited by 60 publications

(39 citation statements)

References 9 publications

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“…Use of these methods in characterization of thermal reservoir is well documented in the literature (BENSON et al, 1997;ZLOTNICKI et al, 1998;CAGLER and DEMIRORER, 1999;MAJUMDAR et al, 2000;SAVIN et al, 2001;RASHED et al, 2003;YASUKAWA et al, 2003). Geothermal reservoir's steam, water or heat can be used for electricity generation and other commercial purposes.…”

Section: Introductionmentioning

confidence: 99%

Integrated Geophysical Studies in the East-Indian Geothermal Province

Baranwal

Sharma

2006

Pure appl. geophys.

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Integrated geophysical surveys using vertical electrical sounding (VES), very low frequency (VLF) EM, radiation counting, total magnetic field and self-potential (SP) measurements are carried out to characterize the geothermal area around a hot spring in the Nayagarh district, Orissa, India that lies in the East Indian geothermal province. The study was performed to delineate the fracture pattern, contaminated groundwater movement and possible heating source. VES interpretations suggest a three-to four-layer structure in the area. Resistivity survey near the hot spring suggests that weathered and fractured formations constitute the main aquifer system and extend to 60 m depth. Current flow measured at various electrode separations normalized by the applied voltage suggests that fractures extend to a greater depth. Detailed VLF study shows that fractures extend beyond 70 m depth. VLF anomaly has also very good correlation with the total magnetic field measured along the same profiles. Study results suggest that a gridded pattern of VLF survey could map the underground conductive fracture zones that can identify the movement of contaminated groundwater flow. Therefore, precautionary measures can be taken to check further contamination by delineating subsurface conducting structures. Self potential (SP) measured over the hot spring does not show a large anomaly in favor of the presence of a sulphide mineral body. A small positive (5-15mV) SP anomaly is measured which may be streaming potential due to subsurface fluid flow. A high radiation is measured about four kilometers from the hot spring, suggesting possible radiogenic heating. However, the exact nature of the heating source and its depth is not known in the area. Deep resistivity followed by a magneto-telluric survey could reveal the deeper structures.

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Section: Introductionmentioning

confidence: 99%

Integrated Geophysical Studies in the East-Indian Geothermal Province

Baranwal

Sharma

2006

Pure appl. geophys.

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“…Several hot springs in different regions of the Indian subcontinent have been known to geologists for many years (6,9,12). However, their microbial diversity has not been explored by molecular phylogenetic approaches.…”

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Molecular Phylogenetic Exploration of Bacterial Diversity in a Bakreshwar (India) Hot Spring and Culture of Shewanella -Related Thermophiles

Ghosh

Bal

Kashyap

et al. 2003

Appl Environ Microbiol

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The bacterial diversity of a hot spring in Bakreshwar, India, was investigated by a culture-independent approach. 16S ribosomal DNA clones derived from the sediment samples were found to be associated with gamma-Proteobacteria, cyanobacteria, and green nonsulfur and low-GC gram-positive bacteria. The first of the above phylotypes cobranches with Shewanella, a well-known iron reducer. This phylogenetic correlation has been exploited to develop culture conditions for thermophilic iron-reducing microorganisms.

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“…Como exemplo, Singh et al (2005) realizaram um estudo da estruturação geoelétrica no Vale do Puga (Índia), uma região próxima ao limite colisional das placas indiana e asiática. Unidades estratigráficas deformadas por falhas e fraturas foram reveladas por seções geoelétricas em contextos tectono-deposicionais tão diversos como a zona geotermal em Bakreswar, na porção daÍndia (Majumdar et al, 2000), e pacotes de arenitos fraturados do Grupo Itararé na Bacia do Paraná (Campos et al, 2005). Appi & Rostirolla (2004) fizeram uso de seções geoelétricas como método geofísico complementar ao levantamento de sísmica de reflexão para a modelagem de anisotropia em sistemas fraturados, também na Bacia do Paraná.…”

Section: Introductionunclassified

Comportamento geoelétrico da sequência drifte da bacia potiguar (RN/CE)

Matos¹,

Castro²,

Junior³

2010

Rev. Bras. Geof.

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ABSTRACT.A 70 km long geoelectric section, formed by twenty-nine vertical electric soundings (VES), reveals the geoelectrical configuration of the drift sequence of Potiguar basin, NE Brazil. This tectono-stratigraphic unit preserves structural records of tectonic activities after the end of the northeastern Brazilian rifting process, since the Albian to present day, and encompasses the main hydrocarbon reservoirs in the onshore portion of the basin. The VES were carried out every 2.0 or 3.0 km along a geophysical cross section to the major axis of the rift architecture. The VES were performed with maximum apertures of the current electrodes, which allow us to investigate depth of 500 to 1000 m. The geological interpretative model was obtained by inversion of the soundings, constrained to a priori information derived from geological mapping, seismic reflection and well logging. The subsurface distribution of geoelectric resistivities reflects the strong structural conditioning of the drift sequence stratigraphic units. At the faulted border of the rift, a set of subvertical, normal faults causes a NW stepping increase in the thickness of the basin infill. While to southeast, the sedimentary cover of the marginal platform has a thickness relatively constant and is little affected by faulting. This model suggests that probable tectonic reactivation of brittle structures of the rift phase determines the structural setting of the drift tectono-sedimentary deposits in the onshore portion of Potiguar basin.Keywords: geoelectric section, drift sequence, tectonic reactivation, Potiguar basin.RESUMO. Uma seção geoelétrica de 70 km de extensão, constituída por vinte e nove sondagens elétricas verticais (SEV's), revela o comportamento geoelétrico da sequência drifte da Bacia Potiguar (RN/CE). Esta unidade tectono-estratigráfica preserva registros estruturais das atividades tectônicas posteriores ao encerramento do processo de rifteamento no Nordeste Setentrional, desde o Albiano até o Recente, e engloba os principais reservatórios de hidrocarbonetos da porção emersa da bacia. As SEV's foram executadas com separação de 2,0 ou 3,0 km, ao longo de um perfil geofísico transversal ao eixo principal da arquitetura rifte da bacia e com aberturas máximas dos eletrodos de corrente que permitiram investigar de 500 a 1000 m de profundidade. O modelo geológico interpretativo foi obtido pela inversão das sondagens elétricas, vinculado a informações a priori oriundas da geologia de superfície, de dados sísmicos de reflexão e da perfilagem de poços exploratórios.A distribuição das resistividades das unidades geoelétricas em subsuperfície reflete o forte condicionamento estrutural dos níveis estratigráficos da sequência drifte. Na borda falhada do rifte, um conjunto de falhas normais subverticais provoca um aumento escalonado das espessuras do pacote sedimentar na direção noroeste. Já na plataforma marginal a sudeste do rifte, a cobertura sedimentar apresenta uma espessura relativamente constante e pouco afetada por expressivos falhamento...

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Geoelectric investigations in Bakreswar geothermal area, West Bengal, India

Cited by 60 publications

References 9 publications

Integrated Geophysical Studies in the East-Indian Geothermal Province

Integrated Geophysical Studies in the East-Indian Geothermal Province

Molecular Phylogenetic Exploration of Bacterial Diversity in a Bakreshwar (India) Hot Spring and Culture of Shewanella -Related Thermophiles

Comportamento geoelétrico da sequência drifte da bacia potiguar (RN/CE)

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