Prospectivity and seismic expressions of pre‐ and post‐salt plays along the conjugate margins of Brazil, Angola and Gabon

Jameson, M.; Wells, Steve; Greenhalgh, J.; Borsato, R.

doi:10.1190/1.3627387

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Brazilian pre-salt reservoirs have proven to be game-changers for the oil and gas industry (Filho et al, 2015;Pizarro and Branco, 2012). Additionally, basins in offshore Angola, Gabon, Cameroon, Democratic Republic of Congo, Equatorial Guinea and Namibia have been proposed as analogous prospects to the Brazilian Pre-Salt with outstanding potential for hydrocarbon reserves (Koch et al, 2013;Jameson et al, 2011). The formation brines in fields from South Atlantic pre-salt reservoirs can have TDS values over 150 000 mg/L (Drexler et al, 2019(Drexler et al, , 2020.…”

Section: Introductionmentioning

confidence: 99%

Correlations between TDS and electrical conductivity for high-salinity formation brines characteristic of South Atlantic pre-salt basins

Rebello

Siepman

Drexler

2020

WSA

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Total dissolved solids (TDS) is an important property in the characterization of natural waters for diversified applications, such as in geochemistry and the petroleum industry. Under appropriate circumstances, the determination of this parameter through correlations with the electrical conductivity (EC) of aqueous systems yields considerable advantages over the gravimetric method. However, the development of empirical equations correlating TDS and EC is still required due to the physical-chemical complexity of charge transport in multicomponent natural waters. Most existing correlations were built considering systems in the lower or medium salinity range. In this context, this research aims to provide experimental correlations between TDS and EC in a broad concentration range for high salinity formation brines characteristic of the pre-salt reservoirs. It contributes to filling a gap in the literature for geochemical systems of this nature. Moreover, correlations were also obtained for a concentrated desulphated seawater and an aqueous sodium chloride solution in the same salinity range. For all aqueous solutions, the polynomial fittings of degree greater than one fit the experimental data better compared to both linear and exponential equations. In addition, the solutions with higher concentration of divalent ions had lower EC than the solutions dominated by monovalent ions with the same ionic strength. This evidences the effect of ion pairing on the EC, particularly in solutions of high ionic strength. Therefore, the use of a general correlation to represent solutions with dramatic variations in chemical composition carries substantial error, particularly in the high salinity range. Thus, a specific correlation must be developed to represent brines with similar composition.

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Section: Introductionmentioning

confidence: 99%

Correlations between TDS and electrical conductivity for high-salinity formation brines characteristic of South Atlantic pre-salt basins

Rebello

Siepman

Drexler

2020

WSA

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Integration of Cretaceous Morro do Chaves rock properties (NE Brazil) with the Holocene Hamelin Coquina architecture (Shark Bay, Western Australia) to model effective permeability

Corbett

Estrella

Rodriguez

et al. 2016

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Coquinas are significant producing facies in the pre-salt reservoirs of Brazil and Angola. This paper describes an analogue model study to help understand the reservoir characterization of coquina reservoirs. Porosity and permeability measured in 39 core plugs from a single coquina bed in a Lower Cretaceous outcrop in NE Brazil have been combined in a three-dimensional geological model for use in reservoir simulation. A training image derived from the geometry of a Holocene coquina analogue in Western Australia controlled the distribution of the bed-scale petrophysical properties from the outcrop. A synthetic well test showed that the effective permeability of the system lies between the geometrical and harmonic averages of the plug data in the layer. There is also moderate flow anisotropy, with preferential fluid flow aligned along the beach ridges. This paper demonstrates how the combination of outcrop data and an appropriate modern environment might be used to improve our understanding of the behaviour of coquina reservoirs and to guide future reservoir studies.

show abstract

Prospectivity and seismic expressions of pre‐ and post‐salt plays along the conjugate margins of Brazil, Angola and Gabon

Cited by 2 publications

References 4 publications

Correlations between TDS and electrical conductivity for high-salinity formation brines characteristic of South Atlantic pre-salt basins

Correlations between TDS and electrical conductivity for high-salinity formation brines characteristic of South Atlantic pre-salt basins

Integration of Cretaceous Morro do Chaves rock properties (NE Brazil) with the Holocene Hamelin Coquina architecture (Shark Bay, Western Australia) to model effective permeability

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