Lacustrine carbonate reservoirs from Early Cretaceous rift lakes of Western Gondwana: Pre-Salt coquinas of Brazil and West Africa

Thompson, Daniel; Stilwell, Jeffrey D.; Hall, Mike

doi:10.1016/j.gr.2014.12.005

Cited by 123 publications

(70 citation statements)

References 25 publications

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“…Abrahão and Warme, 1990;McArgue, 1990;Thomson et al, 2015). Coquina reservoirs are Mollusk-dominated grainstones to rudstones that are interpreted to have been deposited in non-marine lacustrine environments (Carminatti et al, 2009) even though evidences of marine incursions have been reported onshore within the coquina interval in the Sergipe-Alagoas Basin (Thomson et al, 2015).…”

Section: Lower Cretaceous Pre-salt Lacustrine Carbonate Reservoirs (Omentioning

confidence: 99%

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

Fournier¹,

Pellerin²,

Villeneuve³

et al. 2018

Bulletin

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Section: Lower Cretaceous Pre-salt Lacustrine Carbonate Reservoirs (Omentioning

confidence: 99%

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

Fournier¹,

Pellerin²,

Villeneuve³

et al. 2018

Bulletin

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“…1). Although the basins of Sergipe and Alagoas exhibit important differences in terms of their structure and stratigraphy (Thompson et al, 2015), it is possible to define the Sergipe-Alagoas Basin as a single entity (Campos Neto et al, 2007). The basin is known in that its outcrops include all sections of the Brazilian continental margin, with a total estimated area of over 44,000 km².…”

Section: Carbonate Rock Sample Description and Preparationmentioning

confidence: 99%

Computational and experimental pore-scale studies of a carbonate rock sample

Godoy

Pontedeiro

Hoerlle

et al. 2019

Journal of Hydrology and Hydromechanics

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Carbonate rocks host several large water and hydrocarbon reservoirs worldwide, some of them highly heterogeneous involving complex pore systems. Pre-salt reservoirs in the Santos Basin off the south-east coast of Brazil, are an example of such rocks, with much attention focused on proper characterization of their petrophysical and multiphase flow properties. Since it is very difficult to obtain rock samples (coquinas) from these very deep reservoirs, analogues from north-eastern Brazil are often used because of very similar geological age and petrophysical properties. We used a coquina plug from an outcrop in a quarry in northeast Brazil to perform a comprehensive set of analyses. They included Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), and micro-computed tomography (μCT) image acquisition using a series of pixel sizes, as well as direct permeability/porosity measurements. Some of the experimental data were collected from the plug itself, and some from a small sample of the rock slab, including thin sections. Results included the carbonate rock composition and the pore system at different scales, thus allowing us to reconstruct and model the porosity and absolute permeability of the coquina using 3D digital imaging and numerical simulations with pore network models (PNMs). The experimental and numerical data provided critical information about the well-connected pore network of the coquina, thereby facilitating improved predictions of fluid flow through the sample, with as ultimate objective to improve hydrocarbon recovery procedures.

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“…Coquina is an unique lacustrine carbonate rock, mainly composed of shells, can also be profitable reservoir rock. Such as the pre-Salt coquinas of Brazil and West Africa (Thompson et al, 2015), especially in Campos and Santos basins (Fick et al, 2018).The Da'anzhai Member of the Jurassic in the Sichuan Basin is also mainly composed of shells. And it has gone through more than half a century of oil and gas exploration and development (Liang et al, 2011;Li et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluation Methods of Profitable Tight Oil Reservoir of Lacustrine Coquina: A Case Study of Da'anzhai Member of Jurassic in the Sichuan Basin

Pang

Tao

Zhang

et al. 2020

Acta Geologica Sinica (Eng)

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Based on core observation, cast and fluorescent thin sections, FESEM and ESEM, coquina in Da'anzhai Member of Jurassic in Sichuan Basin were examined systematically. Together with production data and logging evaluation, a method for lacustrine coquina evaluation based on geological theory was established up. In the article, two aspects of the study were elaborated, characteristics of favorable reservoirs, and a "five-step" evaluation method for favorable coquina reservoir. According to the correlation between porosity and production data, porosity is not effective in finding high quality coquina reservoir of this area. Whereas micro research of reservoir samples from a high productivity well revealed that sparry coquina is the best lithofacies, with the most developed micro storage space of various kinds. After the favorable reservoir was sorted out, a five-step method evaluating the coquina reservoir was worked out. Correlation of GR value and rock types suggests that GR<30 API is an effective evaluation parameter in identifying profitable reservoir lithofacies. Meanwhile, the combination of profitable reservoir rock thickness and production data revealed that the reservoirs with the highest potentiality are those with thickness of 3-18 m. Fractures are more developed in faults, folds and structural noses in the study area. Organic acid is discharged massively before the peak of hydrocarbon generation, leading to the formation of dissolution pores in the reservoir. The evaluation of organic acid was made by using the source rock indexes. After evaluating the four factors, and compiling their distribution maps, the maps were overlapped to predict favorable reservoir zones, and 7 first class and 9 second class favorable zones of coquina were picked out.

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Lacustrine carbonate reservoirs from Early Cretaceous rift lakes of Western Gondwana: Pre-Salt coquinas of Brazil and West Africa

Cited by 123 publications

References 25 publications

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

The equivalent pore aspect ratio as a tool for pore type prediction in carbonate reservoirs

Computational and experimental pore-scale studies of a carbonate rock sample

Evaluation Methods of Profitable Tight Oil Reservoir of Lacustrine Coquina: A Case Study of Da'anzhai Member of Jurassic in the Sichuan Basin

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