Zeolite and clay-mineral induced resistivity in simulated reservoir sand

Reynolds, William R.; Williford, Clint

doi:10.1016/0920-4105(91)90065-u

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The presence of clinoptilolite is believed related to the close proximity of the well to the salt dome and movement of brines around it or, possibly, to a volcanic ashfall. The high percentage of clinoptilolite skews the average grain density for the clean sands lower, down to 2.59 g/cc in a clean, high porosity sand, and the induction resistivity lower because of its high microporosity (Reynolds and Williford, 1991). Therefore, the reported log analysis water saturations may be slightly high in some thin sands in some wells.…”

Section: Presentation Of Resultsmentioning

confidence: 98%

“….. (4) LARA (Laminated Reservoir Analysis) is a commercial well log analysis program derived from work by Ruhovets (1990). The LARA technique evaluates thinly laminated sand/shale reservoirs using resistivity and porosity logs, and a high-resolution shale indicator, such as the dipmeter resistivity log.…”

Section: Review Of James Klein Methods For Induction Log Anisotropymentioning

confidence: 99%

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Laminated Reservoir Evaluation in a Case of High Apparent Dip

1993

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In several offshore reservoirs composed of thin, interbedded sands and shales, a recently reported technique to correct standard induction logs for the effects of formation dip is incorporated into an established method for the well log analysis of laminated reservoirs to yield a superior petrophysical characterization.Both shale anisotropy and bedding effects are included in the correction of the induction log for apparent dip. In a single well, electrically anisotropic properties of shales are difficult to determine solely by well logs. In the example reservoir, multiple wells with varying hole deviation were drilled from the same platform. By analyzing logged intervals from different wells, the electrical anisotropy of the shales is determined and appropriate corrections are made to the induction log.Procedurally, a laminated reservoir analysis technique using a dipmeter or another high resolution shale indicator is first applied to the log data. Induction resistivities are corrected for dip effects arising from both sand/shale boundaries and shale anisotropy using an estimate of anisotropy. Then, corrected induction resistivities are used in the laminated reservoir analysis technique. Finally, parameters related to shale anisotropy are varied so that the analyses of wells with high and low apparent dip are consistent.Quantitative analysis within each individual well is improved using these methods; more importantly, the combined techniques allow comparative evaluations between wells with significantly different hole deviations. Therefore, inclusion of dip effect corrections yields a more accurate well-to-well comparison in laminated reservoirs.

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Section: Presentation Of Resultsmentioning

confidence: 98%

Section: Review Of James Klein Methods For Induction Log Anisotropymentioning

confidence: 99%

Laminated Reservoir Evaluation in a Case of High Apparent Dip

1993

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“…Portanto, pode-se dizer que a amostra é mais suscetível aos efeitos da pressão de confinamento. Reynolds & Williford (1991), a presença da clinoptilolita nas amostras pode causar uma redução dos valores de resistividade elétrica. Quanto ao coeficiente de cimentação, dados publicados em Hensel et al (1988), mostram um valor de m=1,70 para Berea na pressão de confinamento de 1000psi.…”

Section: Figura 9 -âNgulo De Fase (As) Vs Frequência (F) Para Diferentes Pressõesdolomita Silurianunclassified

Análise do efeito da pressão de confinamento na resistividade elétrica de rochas

Campbell¹,

Ceia²,

Misságia³

et al. 2018

Proceedings of the VIII Simpósio Brasileiro E Geofísica

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This work investigates the effects of confinement pressure on the electrical resistivity and cementation factor of saturated carbonate and siliciclastic samples. For this analysis, an equipment that allows lateral pressure (bi-axial stresses) to be exerted on the rocks was used. The porosity and electrical resistance of the samples were measured and the values of electrical resistivity and cementation factor were calculated. Based on the results, it was possible to determine electrical resistivity behavior patterns in samples exposed to high confinement pressures, thus simulating overload conditions, similar to those imposed on reservoir rocks in situ.

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Elucidating Kinetic, Adsorption and Partitioning Phenomena from a Single Well Tracer Method: Laboratory and Bench Scale Studies

Otero-López

González-Brambila

Dutta

et al. 2016

International Journal of Chemical Reactor Engineering

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This study is aimed at giving some insights on kinetics, adsorption and partitioning of ethyl acetate during a single well tracer test. Synthetic formation water, an specific crude oil and a silicate-dolomite rock were used during experiments performed in laboratory and bench scale systems. Independent sets of experiments were designed to calculate the partition coefficient of ethyl acetate between the formation water and the oil, to develop a kinetic model for the hydrolysis of ethyl acetate, and to derive isotherm and kinetic models for the adsorption of ethyl acetate on the rock. These tracer experiments were evaluated at a concentration range (100–300 mmol.L−1) similar to that supposed to be used in the single well tracer method. All parameters determined from these experiments were validated describing observations from stirred batch and column systems, in which kinetic, adsorption and partitioning phenomena occurred at the same time. Pseudo-heterogeneous models, accounting for three phases namely the formation water, the rock and the oil, were applied to elucidate the interaction of the different mechanisms involved in these set-ups. Main results are summarized as follows: (i) partition coefficients (KEA) were apparent varying from ca. 5–8 because of thermodynamic constraints; (ii) kinetic models for the hydrolysis of ethyl acetate were developed under acid and basic conditions since at neutral ones there were negligible conversions; (iii) the combined Langmuir-Freundlich isotherm and the Langmuir kinetics were the most suitable models describing equilibrium and adsorption rate observations, respectively; (iv) the studied rock adsorbed significant amounts of ethyl acetate, leading to a maximum adsorption capacity (qEAm) of ca. 7.0 mmol.g−1 at studied operating conditions; (v) the adsorption kinetic model rather than the simplified isotherm model seems necessary to describe this phenomenon from the single well test evaluating ethyl acetate as the tracer; and (vi) partition, hydrolysis and adsorption parameters evaluated from independent experiments allowed us to describe observations from both stirred batch and column systems. These results disclose the importance of accounting for partition, hydrolysis and adsorption mechanisms in a single well method using ethyl acetate as the tracer.

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Zeolite and clay-mineral induced resistivity in simulated reservoir sand

Cited by 4 publications

References 7 publications

Laminated Reservoir Evaluation in a Case of High Apparent Dip

Laminated Reservoir Evaluation in a Case of High Apparent Dip

Análise do efeito da pressão de confinamento na resistividade elétrica de rochas

Elucidating Kinetic, Adsorption and Partitioning Phenomena from a Single Well Tracer Method: Laboratory and Bench Scale Studies

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