Correlation of vertical electrical sounding and borehole-log data for delineation of saltwater and freshwater aquifers

Geophysics ◽  
2006 ◽  
Vol 71 (1) ◽  
pp. G11-G20 ◽  
Author(s):  
G. K. Hodlur ◽  
Ratnakar Dhakate ◽  
Rolland Andrade
Keyword(s):  
Cost Effective ◽  
Data Interpretation ◽  
Quantitative Relation ◽  
Well Log ◽  
Log Data ◽  
Resistivity Data ◽  
Electrical Sounding ◽  
Electrical Soundings ◽  
Longitudinal Unit Conductance ◽  
Freshwater Aquifers

In a case history from the Mahanadi basin (India), we demonstrate the use of resistivity data from electric-log soundings and from borehole logs to discriminate between saltwater and freshwater aquifers. We use interpreted data from eight surface-based vertical electrical soundings (VES) and electric well logs from three boreholes in this study. We establish a quantitative relation among longitudinal unit conductance S (obtained from VES), water resistivity [Formula: see text], and layer thickness h. We show that ambiguities in resistivity data interpretation limit its ability to distinguish between freshwater and saltwater aquifers. Electric well-log data interpretation is much more accurate but requires boreholes, which are not cost effective when exploring for groundwater. Integrating well-log-based estimates of [Formula: see text] into resistivity interpretation of surface-based soundings improves its ability to discriminate freshwater aquifers while maintaining cost-effective exploration.

Magnetotelluric signature and well log data interpretation of Santos Basin, Brazil

2009 ◽  
Author(s):  
Vinicius R. Pinto ◽  
Sérgio L. Fontes ◽  
Emin U. Ulugergerli
Keyword(s):  
Data Interpretation ◽  
Well Log ◽  
Log Data

The System of Adaptive Well Log Data Interpretation in Geological Modeling

2012 ◽  
Author(s):  
A.N. Petrov ◽  
D.A. Kozhevnikov ◽  
K.V. Kovalenko ◽  
I.S. Deshenenkov
Keyword(s):  
Data Interpretation ◽  
Well Log ◽  
Geological Modeling ◽  
Log Data

Application of Walsh Filter in Geophysical Well-Log Data Interpretation for Automated Lithological Bed Boundary Detection

2021 ◽  
Author(s):  
Gagandeep Singh ◽  
Deepan Datta ◽  
William K. Mohanty ◽  
Aurobinda Routray ◽  
Rahul Mahadik
Keyword(s):  
Data Interpretation ◽  
Boundary Detection ◽  
Well Log ◽  
Log Data

Well logging data interpretation for appraising the performance of Alam El-Bueib reservoir in Safir Oil Field, Shushan Basin, Egypt

2021 ◽  
Vol 11 (5) ◽  
pp. 2075-2089
Author(s):  
Mohamed Mahmoud Elhossainy ◽  
Ahmed Kamal Basal ◽  
Hussein Tawfik ElBadrawy ◽  
Sobhy Abdel Salam ◽  
Mohammad Abdelfattah Sarhan
Keyword(s):  
Water Saturation ◽  
Data Interpretation ◽  
Effective Porosity ◽  
Oil Field ◽  
Reservoir Quality ◽  
Well Log ◽  
Relative Permeabilities ◽  
Log Data ◽  
Bulk Volume ◽  
Water Cut

AbstractThis paper presents different well log data interpretation techniques for evaluating the reservoir quality for the sandstone reservoir of the Alam El-Bueib-3A Member in Safir-03 well, Shushan Basin, Egypt. The evaluation of the available well log data for the Alam El-Bueib-3A Member in this well indicated high quality as oil-producing reservoir between depths 8108–8133 ft (25 ft thick). The calculated reservoir parameters possess shale volume less than or equal to 9% indicating the clean nature of this sandstone interval, water saturation values range from 10 to 23%, and effective porosity varies between 19 and 23%. Bulk volume of water is less than 0.04, non-producing water (SWirr) saturation varies between 10 and 12%, and permeability ranges from 393 to 1339 MD reflecting excellent reservoir quality. The calculated BVW values are less than the minimum (BVWmin = 0.05) reflecting clean (no water) oil production, which was confirmed through the drill stem test (DST). The relative permeabilities to both water and oil are located between 0.01–0 and 1.0–0.5, respectively. The water cut is fairly low where it ranges between 0 and 20%. Additionally, the water saturation values are less than the critical water saturation (Scw = 29.5%) which reflects that the whole net pay will flow hydrocarbon, whereas the water phase will remain immobile. This was confirmed with reservoir engineering through the DST.

scholarly journals Methodology for determining the average diameter of rock pores and channels by well-log data based on lithological and petrophysical studies

2021 ◽  
pp. 47-57
Author(s):  
N.A. Skibitskaya ◽  
V.A. Kuzmin ◽  
M.N. Bolshakov ◽  
K.V. Kovalenko ◽  
E.A. Babich ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Pore Space ◽  
Average Diameter ◽  
Digital Processing ◽  
Data Interpretation ◽  
Space Structure ◽  
Well Log ◽  
Electron Microscopic ◽  
Log Data ◽  
Pore Space Structure

The paper presents a method for determining the parameters characterizing the features of the pore space structure of rocks continuously along the section, based on the results of well-log data interpretation. The results of the well-log data interpretation are presented with diagrams of average values of pore and channel diameters calculated continuously along the section, which are consistent with the results of laboratory measurements on rock samples. The proposed method is based on the use of the established correlation relationships between the slope tangent of the graph of dependence of gas permeability on reciprocal of mean pressure drop and the parameters of the pore space structure, determined from the digital processing of raster electron microscopic images.

The Adaptive Well Log Data Interpretation in Geological Modeling

2012 ◽  
Author(s):  
Dmitry Kozhevnikov ◽  
Kazimir Kovalenko ◽  
Ivan Sergeevich Deshenenkov
Keyword(s):  
Data Interpretation ◽  
Well Log ◽  
Geological Modeling ◽  
Log Data

scholarly journals WELL LOG DATA INTERPRETATION IN PALEOGEOGRAPHIC RECONSTRUCTIONS (IN THE CASE OF THE BATHONIAN-UPPER JURASSIC DEPOSITS OF SOUTH OF WEST SIBERIA)

2019 ◽  
pp. 27-38
Author(s):  
P. A. Yan ◽  
E. M. Khabarov
Keyword(s):  
Oil And Gas ◽  
West Siberia ◽  
Data Interpretation ◽  
Upper Jurassic ◽  
Well Log ◽  
The South ◽  
The West ◽  
Log Data ◽  
The Core

According to the results of a comprehensive sedimentological study of the core and well log data, the dissection of the bat-upper Jurassic sediments of the South of the West Siberian oil and gas basin was carried out. Quasi-isochronous marked levels are identified. They are represented by transgressive surfaces, maximum flooding surfaces and extended carbonaceous layers. They are the basis of the performed correlation. A number of characteristic lithological-facies sequences diagnosed by well log data was established.

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