Measurement of Formation Resistivity Through Steel Casing

1995 ◽  
Author(s):  
B. Sh. Singer ◽  
O. Fanini ◽  
K.-M. Strack ◽  
L.A. Tabarovsky ◽  
X. Zhang
Keyword(s):  
Formation Resistivity

Determining Formation Resistivity Anisotropy in the Presence of Invasion

2004 ◽  
Author(s):  
Tom Barber ◽  
Barbara Anderson ◽  
Aria Abubakar ◽  
Tracy Broussard ◽  
Kuo-Chaing Chen ◽  
...  
Keyword(s):  
Resistivity Anisotropy ◽  
Formation Resistivity

scholarly journals ELECTRICAL AND ACOUSTIC PARAMETERS OF LOWER PERMIAN CARBONATE ROCKS (WESTERN PART OF THE HLYNSKO-SOLOKHIVSKYI OF GAS-OIL-BEARING DISTRICT OF THE DNIEPER-DONETS BASIN)

2020 ◽  
pp. 49-58
Author(s):  
S. Vyzhva ◽  
V. Onyshchuk ◽  
I. Onyshchuk ◽  
M. Reva ◽  
O. Shabatura
Keyword(s):  
Electrical Resistivity ◽  
Relative Permittivity ◽  
Donets Basin ◽  
Lower Permian ◽  
Atmospheric Conditions ◽  
Reservoir Water ◽  
P Waves ◽  
Reservoir Conditions ◽  
Specific Electrical Resistivity ◽  
Formation Resistivity

The main objective of this article is to study electrical parameters of Lower Permian carbonate rocks of Western part of the Hlynsko-Solokhivskyi gas-oil-bearing district of the Dnieper-Donets Basin (DDB) in normal (atmospheric) and modeling (reservoir) conditions. In atmospheric conditions it has been revealed that the resistivity of dry extracted limestones (the specific electrical resistivity of framework of grains was measured) varies from 12.147 kΩ⋅m to 111.953 MΩ⋅m (mean 1.542 MΩ⋅m). The resistivity of saturated limestone samples with kerosene varies from 44.478 kΩ⋅m to 14.449 MΩ⋅m (mean 1.435 MΩ⋅m). The resistivity of dry and saturated with kerosene samples is almost the same. The resistivity of limestones saturated with model of reservoir water (salinity M = 190 g/l) is lower and varies from 1.11 Ω⋅m to 23.16 Ω⋅m (mean 3.12 Ω⋅m). It has been determined that formation resistivity factor of limestones in atmospheric conditions varies from 13.5 to 230 Ω⋅m (mean 32.5 Ω⋅m). In addition to resistivity, the parameter of relative permittivity of investigated limestones was studied. It was determined that relative permittivity of dry limestones varies from 3.0 to 7.5 (mean 4.2). Relative permittivity saturated samples of limestones with kerosene varies from 2.8 to 8.8 (mean 4.5) and practically does not differ from dry ones but significantly lower than values of samples saturated with model of reservoir water (from 655 to 9565, mean 4280). That means when pores of limestones are saturated with NaCl solution their relative permittivity increases rapidly – from hundreds to thousands times (on average 944 times). It can be explained by the high conductivity of model of reservoir water. Limestones saturated with NaCl solution have velocities of P-waves in the range from 3346 m/s to 4388 m/s (mean 4030 m/s), and velocities of Swaves – from 1753 m/s to 2121 m/s (average 1942 m/s). If rocks are saturated with kerosene then velocities have strictly higher values – P-waves from 3433 m/s to 4514 m/s (mean 4011 m/s) and S-waves – from 2137 m/s to 2464 m/s (average 2344 m/s). Physical modelling of reservoir conditions (temperature 50 °С, pressure 30 MPa) showed that the specific electrical resistivity varies from 0.81 Ω⋅m to 13.19 Ω⋅m (mean 2.67 Ω⋅m), and limestones – from 0.49 Ω⋅m to 7.81 Ω⋅m (mean 1.95 Ω⋅m). Also, "specific electrical resistivity – pressure" connection was investigated. Due to the closure of microcracks and the deformation of the pore space, the electrical resistance of rocks increases with increase of pressure. The regression dependence of the formation resistivity enlargement factor with pressure for the studied rocks has a linear character. It was determined that in reservoir conditions the range of the formation resistivity factor for limestones varied from 17.3 to 271.9 Ω⋅m (mean 50.7 Ω⋅m), and range of variation of porosity coefficient was from 0.040 to 0.169 Ω⋅m (mean 0.118 Ω⋅m). The comprehensive analysis of petrophysical data has been resulted in a set of correlation ratios between reservoir, electric and elastic parameters of studied limestones in normal and modeling conditions.

Classification of Formation Resistivity Factor Data Based on Electrical Tortuosity

2019 ◽  
Author(s):  
A. Soleymanzadeh ◽  
A. Helalizadeh ◽  
M. Jamialahmadi ◽  
B. Soltani Soulgani
Keyword(s):  
Formation Resistivity ◽  
Factor Data

Some applications of clay mineralogy to reservoir description

Clay Minerals ◽  
1986 ◽  
Vol 21 (4) ◽  
pp. 811-826 ◽  
Author(s):  
A. Hurst ◽  
J. S. Archer
Keyword(s):  
Clay Mineralogy ◽  
Sand Production ◽  
Water Contact ◽  
Reservoir Evaluation ◽  
Sandstone Diagenesis ◽  
Porosity And Permeability ◽  
Neutron Porosity ◽  
Wireline Logs ◽  
Formation Resistivity ◽  
Reservoir Description

AbstractStudy of sandstone diagenesis provides information about the origin, texture, distribution and composition of clay minerals, which in turn is used in reservoir description. Three examples of the use of clay mineralogy in reservoir description are given. (1) Kaolinite commonly forms pore-filling cements which are pervasive in specific sandstone intervals. It is shown that water-zone kaolinization homogenizes and lowers the porosity and permeability relative to the oil zone; in a reservoir model different Ø/Krelationships are defined above and below the oil-water contact. (2) An occurrence of chlorite in dish-structured horizons is shown to increase horizontal permeability and decrease formation resistivity. The sensitivity of the neutron porosity log to the chlorite cement reduces the usefulness of the log for porosity evaluation. Uncritical application of wireline logs to define reservoir parameters can give pessimistic reservoir evaluation. (3) Sand production can be related to wettability, which in turn is strongly influenced by clay mineralogy. A perforation strategy to minimize sand production may then be based on knowledge of the clay mineralogy of a reservoir.

Experimental Study on the Relationship Between Reservoir Permeability and Its Formation Resistivity Factor

2014 ◽  
Vol 57 (4) ◽  
pp. 563-573
Author(s):  
LIU Zhong-Hua ◽  
WU Shu-Qin ◽  
DU Bao-Hui ◽  
LI Chao-Liu ◽  
HU Song ◽  
...  
Keyword(s):  
Experimental Study ◽  
Reservoir Permeability ◽  
Formation Resistivity ◽  
The Relationship
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