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Equilibrium modeling of water-gas systems in Jurassic–Cretaceous reservoirs of the Arctic petroleum province, northern West Siberia

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Petroleum Exploration and Development 2022年第2期49卷 363-373页

作者： NOVIKOV Dmitry Anatolievich Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences(IPGG SBRAS) Avenue Kop-tyuga3Novosibirsk 630090Russia Novosibirsk State University Str.Pirogova1Novosibirsk 630090Russia

To reveal the equilibrium state of oil and gas and water in a petroliferous basin with a high content of saline water, calculations of water-gas equilibrium were carried out, using a new simulation method, for the Arctic territories of the West Siberian oil and gas bearing province. The water-bearing layers in this area vary widely in gas saturation and have gas saturation coefficients(C;) from 0.2 to 1.0. The gas saturation coefficient increases with depth and total gas saturation of the formation water. All the water layers with gas saturation bigger than 1.8 L/L have the critical gas saturation coefficient value of 1.0, which creates favorable conditions for the accumulation of hydrocarbons;and unsaturated formation water can dissolve gas in the existent pool. The gas saturation coefficient of formation water is related to the type of fluid in the reservoir. Condensate gas fields have gas saturation coefficients from 0.8 to 1.0, while oil reservoirs have lower gas saturation coefficient. Complex gas-water exchange patterns indicate that gas in the Jurassic–Cretaceous reservoirs of the study area is complex in origin.

关键词： water-gas system hydrocarbon accumulations Jurassic–Cretaceous oil reservoir West Siberia Arctic petroleum province

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Geological Conditions and hydrocarbon Accumulation Processes in the Sahul Platform, Northern Bonaparte Basin, Australia

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International Journal of Geosciences 2016年第6期7卷 792-827页

作者： Rakotondravoavy Jules Jiaren Ye Qiang Cao Key Laboratory of Tectonics and Petroleum Resources China University of Geosciences MOE Wuhan China Département des Sciences de la Terre et de l'Environnement à la Faculté des Sciences de Technologies et de l’Environnement de l'Université de Mahajanga Mahajanga Madagascar

The Sahul Platform where the Sunset-Loxton Shoals and Chuditch gas fields were discovered is located between the Timor Trough to the north and the Malita Graben to the south. These areas are located respectively 440 km and 380 km northwest of Darwin in the northern Bonaparte Basin, Australia. Based on the structural evolution of the northern Bonaparte Basin, data from the wells Loxton Shoals 1, Sunset 1 and Chuditch 1 in the Sahul Platform and Heron 1 in the Malita Graben depocentre, and the Seismic Line N11606 were used to clarify the geological conditions and reconstruct the hydrocarbon accumulation processes in the study area. BasinMod 1-D, 2-D, and 3-D software was used for modeling. The Plover Formation source rock was a poor-to-good hydrocarbon generative potential and reached the middle to late mature oil window in the Sunset-Loxton Shoals field whereas in the Chuditch field, it was an overall fair-to-good hydrocarbon generative potential, and attained the Late mature oil window. The Flamingo, and the Echuca Shoals formations source rocks in the same field were a fair and good hydrocarbon generation potential respectively, and both reached mid-mature oil window. In the Malita Graben depocentre, the Petrel (Frigate) and the Echuca Shoals formations source rocks were a poor-to-very good hydrocarbon generating potential, and had attained wet gas window at the present day. The analyses of organic matter showed that the source rocks in the study area and Malita Graben were gas prone with kerogen types II2 & III and III predominantly. The Middle Jurassic Plover Formation sandstone reservoir in the Sunset-Loxton field was a poor-to-very good quality and potential for gas beds, and it was a very poor-to-very good quality and potential for gas beds in the Chuditch field. The intensities of gas generation and expulsion were more than of oil ones either in the Sahul Platform or in the Malita Graben. The Plover, Petrel (Frigate) and Echuca Shoals formations source rocks

关键词： Basin Modeling hydrocarbon accumulations Northern Bonaparte Basin Sahul Platform

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