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Changing of carbonate reservoir rocks on the final phase evolution petroleum geofluid systems

Authors: E.A. Korolev, V.P. Morozov, A.N. Kolchugin, A.A. Eskin, E.M. Nurieva (Kazan (Volga Region) Federal University, RF, Kazan)

Key words: Tournaisian stage, oil, reservoir rocks, oil-water zones.

The authors studied conditions of changing carbonate reservoir rocks of Tournaisian stage in phase of water-flooding of oil reservoirs. We studied the sequence of changes in the pore volume in the limestone caused by oil oxidation products and identified three stages of change rocks: 1) increase of porosity, caused by activation of dissolution processes in mineral skeleton of rocks; 2) formation at the periphery of cavities thin crusts of calcite, which reduces of pore volume; 3) filling of open pore space large grains of calcite. These stages correspond to bitumen, water-bitumen and water subzones in structure of water-oil contact zones. Involvement in the development oxidized parts of oil reservoirs is important direct in oil exploration industry, today. Regularities identified in the work can help to choose methods of impact on the oil reservoir with heavy oil and bitumen.
References
1. Helgeson H.C., Knox A.M., Owens C.E., Shock E.L., Petroleum, oil field waters, and authigenic mineral assemblages. Are they in metastable equilibrium in hydrocarbon reservoirs, Geochimica et Cosmochimica Acta, 1993, V. 57(14), pp. 3295–3339.
2. Kolchugin A.N., Morozov V.P., Korolev E.A., Diagenesis of carboniferous carbonate rocks reservoirs case study: (Central part of Volga-Ural Basin), World Applied Sciences Journal, 2013, V. 24 (6), pp. 712–718.
3. Belonin M.D., Gol'dberg I.S., Gribkov V.V., Iskritskaya N.I., Improving the efficiency of the integrated development of metalliferous heavy oil and bitumen deposits (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology, 1990, no. 9, pp. 2–4.
4. Yulbarisov E.M., On enhanced oil recovery the waterflood reservoirs (In
Russ.), Neftyanoe khozyaystvo = Oil Industry, 1981, no. 3, pp. 36–40.

Key words: Tournaisian stage, oil, reservoir rocks, oil-water zones.

The authors studied conditions of changing carbonate reservoir rocks of Tournaisian stage in phase of water-flooding of oil reservoirs. We studied the sequence of changes in the pore volume in the limestone caused by oil oxidation products and identified three stages of change rocks: 1) increase of porosity, caused by activation of dissolution processes in mineral skeleton of rocks; 2) formation at the periphery of cavities thin crusts of calcite, which reduces of pore volume; 3) filling of open pore space large grains of calcite. These stages correspond to bitumen, water-bitumen and water subzones in structure of water-oil contact zones. Involvement in the development oxidized parts of oil reservoirs is important direct in oil exploration industry, today. Regularities identified in the work can help to choose methods of impact on the oil reservoir with heavy oil and bitumen.
References
1. Helgeson H.C., Knox A.M., Owens C.E., Shock E.L., Petroleum, oil field waters, and authigenic mineral assemblages. Are they in metastable equilibrium in hydrocarbon reservoirs, Geochimica et Cosmochimica Acta, 1993, V. 57(14), pp. 3295–3339.
2. Kolchugin A.N., Morozov V.P., Korolev E.A., Diagenesis of carboniferous carbonate rocks reservoirs case study: (Central part of Volga-Ural Basin), World Applied Sciences Journal, 2013, V. 24 (6), pp. 712–718.
3. Belonin M.D., Gol'dberg I.S., Gribkov V.V., Iskritskaya N.I., Improving the efficiency of the integrated development of metalliferous heavy oil and bitumen deposits (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology, 1990, no. 9, pp. 2–4.
4. Yulbarisov E.M., On enhanced oil recovery the waterflood reservoirs (In
Russ.), Neftyanoe khozyaystvo = Oil Industry, 1981, no. 3, pp. 36–40.


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