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Search Results: 1 - 10 of 6910 matches for " Reservoir Estimation "
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Structural Interpretation and Petrophysical Analysis for Reservoir Sand of Lower Goru, Miano Area, Central Indus Basin, Pakistan  [PDF]
Muhammad Sohail Khan, Farhana Masood, Qadeer Ahmed, Ishtiaq Ahmed Khan Jadoon, Naveed Akram
International Journal of Geosciences (IJG) , 2017, DOI: 10.4236/ijg.2017.84020
Abstract: The main purpose of this research is to estimate the structural analysis and hydrocarbon potential of Miano Block by using seismic and well log techniques. Miano area hosts a number of gas fields with structural and stratigraphic traps. The area is located in Central Indus Basin which is a part of an extensional regime exhibiting normal faulting due to the split of the Indian Plate firstly from Africa and then from Madagascar and Seychelles. Miano area recognized as a proven petroleum province which has complex tectonic history of Cretaceous extensional and overprints of Tertiary strike-slip tectonics. The area has prospect with accumulation of hydrocarbons in structural and stratigraphic traps including pinchouts. NW-SE oriented Khairpur and Mari Highs are main structural features with impact on the fault system. The sands of Lower Goru of Lower Cretaceous age are acting as a reservoir in the area. The area has great potential of hydrocarbons for which more exploratory wells are required to be drilled with better insight of structural and stratigraphic traps.
Application of Isotopic Information for Estimation of Parameters in Concentration Model

王涛, 包为民, 徐海丽, 李铭, 刘超, 钟毫忠
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.16065
Abstract: 坡地汇流过程是流域汇流的重要组成部分。基于设计的室内土槽降雨径流同位素实验,以线性水库汇流模型为例,利用同位素信息分割流量过程线为直接降雨和土壤水两种水源,与水文信息相结合,确定线性水库汇流模型参数。实验结果表明,利用同位素信息可以分别确定线性水库汇流参数直接降雨消退系数和土壤水消退系数,在一定程度上可以降低参数确定的不确定性。同位素流量过程线分割中误差累积对利用同位素信息确定线性水库汇流参数结果有一定影响。
Hillslope concentration is an important component of concentration in catchment. Based on designed rainfall-runoff experiment in trough and the linear reservoir concentration model, the total discharges of trough were separated into two-component water sources: direct precipitation and soil water. The parameters of concentration model were estimated by using isotopic and hydrologic information. The experimental results showed that recession coefficients of direct precipitation and soil water in concentration model could be individually estimated by using isotopic information, and that the uncertainty of parameters were effectively reduced. The result of parameter estimation was affected by the errors of hydrograph separation.
A well-log regression analysis for P-wave velocity prediction in the namorado oil field, Campos basin
Augusto, Fabrício de Oliveira Alves;Martins, Jorge Leonardo;
Revista Brasileira de Geofísica , 2009, DOI: 10.1590/S0102-261X2009000400005
Abstract: geophysical well log measurements are key information for the development of oil and gas reservoirs. however, the absence of a certain fundamental well log, for instance, the compressional-wave (p-wave) sonic log, prevents the application of specific risk-assessment techniques. therefore, the application of methodologies for estimating log records absent in wells is of great importance in the reservoir characterization and development procedures. in this paper, we use the regression analysis methodology for estimating p-wave sonic log measurements. effective porosity, shaliness and electrical resistivity are established, individually or in a combined way, as the parameters for describing p-wave velocity variation in namorado oil field, campos basin. two general equations provide 28 empirical models with potential use in estimating p-wave velocity variation from well log measurements. application of least-squares technique leads to the determination of lithology-related regression coefficients at the surroundings of two wells chosen for verifying the empirical models. the results show the equivalence of both general equations used for obtaining empirical models for p-wave velocity estimation. as confirmation of papers published previously, empirical models assuming effective porosity and/or shaliness as dependence parameters play a fundamental role in the prediction of velocity variation. nevertheless, the velocity calibration process exhibits high stability for empirical models in which electrical resistivity is used as an additional dependence parameter.
Dukan Dam Reservoir Bed Sediment, Kurdistan Region, Iraq  [PDF]
Rebwar Hassan, Nadhir Al-Ansari, Salahalddin S. Ali, Ammar A. Ali, Twana Abdullah, Sven Knutsson
Engineering (ENG) , 2016, DOI: 10.4236/eng.2016.89054
Abstract: The Dukan Dam Reservoir (DDR) in the Kurdistan Region of Iraq has been studied to determine the characteristics and nature of the reservoir and the deposited sediments on its bottom surface. This study was achieved by doing a field survey and grain size analyses of the collected sediment samples at 32 locations representing the whole reservoir area that had been created when the Lesser Zab River was dammed in 1959. The Dukan Dam, which is a multi-purpose concrete arch dam, was built on the Lesser Zab River for controlling its flood during high rainfall seasons, irrigation and power generation. The catchment area is 11,690 km2. The surface area of the reservoir is 270 square kilometers and the volume is 6.870 × 106 m3 at normal operation level (El. 511.00 m. a.s.l.). The minimum drawdown level is at elevation 469 m above sea level (a.s.l.). The live storage is 6.14 × 106 m3 while the remainder is dead storage. The reservoir has a surface area that reaches 270 square kilometers and is composed of two sub-reservoirs connected by a narrow channel that has a length of 5 kilometers. The relatively bigger reservoir is located in the north and has a triangular shape with a surface area approximately 250 square kilometers. The smaller sub-reservoir is located down south where the dam exists and it has irregular rectangular shape. Thirty-two sediment samples were collected from the bottom of Dukan reservoir. The bed of the reservoir is mainly composed of 15% gravel, 14% sand, 48% silt and 23% clay respectively. Most of the sediments are very fine grained, very poorly sorted, strongly coarse skewed and mesokurtic.
Archie''''s parameters by whole core analysis and its application on the evaluation of gas saturation of inhomogenous igneous rovk reservioir in the XX aera of DQ Oil Field

HAN Xue-hui,HE Yi-cheng,WANG Ji-yi,DAI Shi-hua,KE Shi-zhen,

地球物理学进展 , 2007,
Abstract: An idea that Archie's parameters(cementation exponent m,saturation exponent n) should be measured by whole core analysis for the estimation of oil and gas saturation in inhomogenous reservoir was put forward.With the employment of whole core multi-parameters measurement device and measurement method developed by Xinjiang Well Logging Company,7 whole cores from inhomogenous igneous reservoir in the XX area of DQ oil field were measured.When the Archie's parameters were applied in the estimation of oil and gas saturation,the error of gas saturation was within 5% compared to the gas saturation from sealed core,was about 10% higher than the estimation by classical Archie parameters(m=n=2).With a view to inhomogenous reservoir's special property in lithology,porosity,penetrability and pore structure,whole core analysis should be used for the estimation of oil saturation in inhomogenous reservoir.Also,it was necessary to pay more attention to the development of full-size core multi-parameters measurement device that can simulate the reservoir condition.
Study of the Law about Water-Cut Variation for the Fractured Metamorphic Reservoir of Buried Hill with Bottom Water  [PDF]
Shenggao QIN, Yanling SUN, Zhenqi JIA, Dagang YANG
Energy and Power Engineering (EPE) , 2009, DOI: 10.4236/epe.2009.11007
Abstract: Aiming at the complex flowing environment including the buried hill of Metamorphite, the active bottom water and the fracture at Budate Reservoir within Beir Depression of the Hailar Basin, combining the laboratory studies and based on analysis of its drive mechanism, field wells’ parameters were used to analyze the effects of different conditions of the fractured metamorphic reservoir with bottom water on its law of wa-ter-cut variation and the waterflooding efficiency. The results show that for the Budate buried hill reservoir with bottom water, the gravity should be taken into consideration to determine reasonable perforation ratio and production pressure difference. And because of the acid sensitivity of the buried hill reservoir, application of proper clay stabilizer will enhance the field oil recovery to a satisfactory extent.
Sedimentation Processes and Useful Life of Mosul Dam Reservoir, Iraq  [PDF]
Issa E. Issa, Nadhir Al-Ansari, Govand Sherwany, Sven Knutsson
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510094

The sedimentation process is the most important problems that affects directly the performance of reservoirs due to the reduction of the storage capacity and possible problems effecting the operation. Thus periodic assessment of the storage capacity and determining sediment deposition patterns is an important issue for operation and management of the reservoirs. In this study, bathymetric survey results and an analytical approach had been used to assess the characteristics of sedimentation and estimate the useful life of Mosul Reservoir. It is located on the Tigris River in the north of Iraq. The water surface area of its reservoir is 380 km2 with a designed storage capacity of 11.11 km3 at a maximum operating level (330 m a.s.l). The dam started operating in 1986. No detailed study was yet carried out to assess its reservoir. The present study indicated that the annual reduction rate in the dead and live storage capacities of the reservoir is 0.786% and 0.276% respectively. The observed results (bathymetric survey) and algebraic formula show approximately that the useful life of Mosul dam reservoir is about 125 years. Furthermore, the stage-storage capacity curves for the future periods (prediction curves) were established using bathymetric survey data.

Hydro Development-Induced Environmental Impact on River Ecosystem  [PDF]
Qingran Wang
Open Journal of Social Sciences (JSS) , 2013, DOI: 10.4236/jss.2013.15001

Based on the analysis of river ecosystem characteristics, the external problem of hydropower development is detailedly analyzed. Dam plays the important role in regulating regional water resources, reducing the storage of flood disaster, producing clean energy. However, the river system of morphology, topography, water quality and ecological environment are adversely affected. The controlling countermeasures of ecological compensation mechanism, the artificial cultivation of ecological system are proposed.

Petrophysical Analysis of Reservoirs Rocks at Mchungwa Well in Block 7 Offshore, Tanzania: Geological Implication on the Reservoir Quality  [PDF]
Amina S. Mjili, Gabriel D. Mulibo
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.88045
Abstract: The present work highlights the results of the study conducted to estimate the petrophyiscal properties of the Mchungwa well with the aim of assessing the quality of reservoirs rocks. A set of well logs data from Mchungwa well were used for the analysis that involved identification of lithology, hydrocarbon and non-hydrocarbon zones and determinations of petrophysical parameters such as shale volume, porosity, permeability, fluid saturation and net pay thickness. This study was able to mark six sandstone zones with their tops and bases. Of the six zones hydrocarbon indication was observed on four zones from which estimation of petrophysical parameters was done to assess the reservoirs quality. The petrophysical parameters across the four reservoirs yield an average shale volume ranging from 0.08 to 0.15 v/v. The porosity ranges from 7% to 23%, indicating a fair to good porosity sandstone, while permeability ranges from 0.01 to 6 mD. The porosity and permeability results suggest that the quality of the sandstone reservoirs identified at Mchungwa well is poor. Fluid types defined in the reservoirs on the basis of neutron-density log signatures and resistivity indicate a mixture of water and gas. However, high water saturation (50% - 100%) indicates that the proportion of void spaces occupied by water is high, thus, indicating low hydrocarbon saturation of 2.4%, 17.9%, 19.2% and 39.3%. Generally the results show that hydrocarbon potentiality at Mchungwa well is extremely low because of small net pay thickness and very low hydrocarbon saturation. This could be attributed to the geology of the surrounding area where low hydrocarbon saturation suggest the presence of non-commercial volumes of either migrant gas or gas generated from the interbedded claystone sediments, which are dominant in the observed well.
Petrophysical Analysis of the Mpera Well in the Exploration Block 7, Offshore Tanzania: Implication on Hydrocarbon Reservoir Rock Potential  [PDF]
Juma M. Mheluka, Gabriel D. Mulibo
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.88047
Abstract: The present study provides evaluation and estimation of petrophysical parameters and assessment of lithology and their thicknesses in order to characterize present reservoir rocks at Mpera well located in Exploration Block 7, deep offshore Tanzania. To achieve the objectives the wire-line logs, Techlog program was used for assessment, analysis, computation and interpretations of petrophysical parameters and results were integrated through interpretation of well logs. The results from wire-line logs reveal three (3) non hydrocarbon-bearing reservoir rocks i.e., Mpera splay (sandstone), Mpera deep sand 1 (sandstone and limestone) and Mpera deep sand 2 (sandstone and limestone) with gross thickness of 94.335 m, 28.905 m and 12.967 m respectively. The average permeability values of the reservoir rocks were 9.47 mD, 6.45 mD and 4.67 mD, while average porosity values were 14.57%, 17.4% and 16.75%, with average volume of shale 25.7%, 23.5% and 9.7% at Mpera splay, Mpera deep sand 1 and Mpera deep sand 2 respectively. These results signify poor permeability; good porosity and good quality reservoir in terms of volume of shale. Fluid type defined in the reservoirs was basically water. High water saturation (90.6% - 97.7%) in the reservoir zones of the Mpera well indicates that the proportion of void spaces occupied by water is high, thus, indicating less than 10% hydrocarbon saturation. The findings indicate that Mpera well reservoir rocks are of low quality with non-hydrocarbon bearing such that it is not potential for hydrocarbon production.
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