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| Paper Type | : | Research Paper |
| Title | : | An Appraisal of Groundwater Resources and Sustainable Stratigies for Recharge of Aquifers in State Of Rajasthan |
| Country | : | India |
| Authors | : | S.K.Maanju, K. Saha, G.R.Jakhar |
 |
: | 10.9790/0990-0140109  |
Downloads : Times |
Abstract: The largest State of India, Rajasthan has since beginning witnessed scanty and erratic rainfall, which is lonely source of groundwater recharge. More than 90% of land area is irrigated by groundwater and main source of domestic water is also groundwater. Excessive withdrawal of groundwater has posed serious problems and resulted in depletion of this natural resource. The water level has been declining at an alarming rate of 1 to 2 mts. per year in critical aquifers which is a matter of great concern for every one specifically for future generations. The authors in this paper suggest viable methodologies for arrest of declining trend of water level by adopting various artificial recharge methods and an emphasis is given for deciding accurate recharge method.
Key words: Aquifer, Groundwater, Recharge.
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| Paper Type | : | Research Paper |
| Title | : | Determination of Hydraulic Characteristics Using Electrical Resistivity Methods – A Case Study from Vanur Watershed, Villupuram District, Tamil Nadu |
| Country | : | India |
| Authors | : | V.Arulprakasam, R.Sivakumar, B.Gowtham |
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: | 10.9790/0990-0141014 |
Downloads : Times |
Abstract: In groundwater investigations, various parameters of the aquifers are conventionally estimated through long-duration aquifer performance test in wells. In multi-aquifer systems, a number of pumping and observation wells are required for realistic assessment of aquifer characteristics. The expenditure involved in construction and testing of wells often impose constraints on testing individual aquifer zones in such cases. Empirical relations established between aquifer parameters such as hydraulic conductivity (K) / Transmissivity (T) and parameters computed from geophysical investigations such as electrical resistivity / Transverse resistance could be used to estimate the aquifer parameters of different aquifer zones. An attempt has been made in the present study to assess the hydraulic conductivity of Vanur watershed of Villupuram district, Tamil Nadu using surface electrical resistivity surveys. The aquifer system consists of Alluvium, Sandstone and Limestone with intercalations of clay. The bulk porosity of the aquifers has been estimated by using Archie's equation and it ranges from 0.19 to 0.39. Empirical relations have been established between geophysical and aquifer parameters for the study area and the same have been validated with the results of pumping test.
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| Paper Type | : | Research Paper |
| Title | : | Formation evaluation of X7 field in the Niger Delta: evidence from Petrophysical data. Niger Delta, Nigeria. |
| Country | : | Nigeria |
| Authors | : | Eze M. O, A.W Mode, Ugbor C.C |
|
: | 10.9790/0990-0141521 |
Downloads : Times |
Abstract: The reservoirs from three wells of greater ughelli depobelts were evaluated in this study in order to assess the qualities of the reservoirs: The geometric properties, water saturation, and volume of shale were computed and these revealed that the reservoirs are of good qualities. In addition, the depositional environments were characterized using gamma ray log. Generally, the petrophysical characteristics of the reservoirs are good especially at the areas of interest (hydrocarbon zones). The average total porosity and effective porosity ranges from 0.13%-0.34% and 0.12%-0.31% respectively which is within the range for commercial accommodation of hydrocarbon. The volume of shale values for some of the reservoirs are within the limits that could not affect the water saturation (0.05v/v decimal- 0.21v/v decimal). The water saturation in some zones is appreciably low (0.14%- 0.47%) This makes for high hydrocarbon accumulation in those zones. The neutron –log and density- log responses in well 04 and 06 presume that the hydrocarbon in most zones is gas due to the 'crossover' of the logs. The gamma ray log shapes of the reservoirs are predominately cylinder (serrated) shape in the three wells which indicates that the depositional environment was deltaic.
Keywords: Depositional Environment, Facies, Hydrocarbon, Niger delta, Petrophysical evaluation
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