Influence of heterogeneity on fluid property variations in carbonate reservoirs with multistage hydrocarbon accumulation: A case study of the Khasib formation, Cretaceous, AB oilfield, southern Iraq

The fluid distribution is considerably influenced by the reservoir homogeneity. This study analyzes carbonate reservoir heterogeneity and hydrocarbon accumulation processes in the Khasib reservoirs in AB oilfield in the Middle East to discuss factors controlling the distribution of fluid and the eff...

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Bibliographic Details
Published in:Open Geosciences 2022-07, Vol.14 (1), p.663-674
Main Authors: Wang, Qiang, Wen, Tao, Li, Hongxi, Zeng, Xinyao, Wang, Xingzhi, Xin, Jun, Sun, Li, Wang, Chunpu, Zhou, Yuezong
Format: Article
Language:English
Subjects:
Accumulation
carbonate reservoir heterogeneity
Cretaceous
Crude oil
fluid distribution
heavy oil
Heterogeneity
Horizontal wells
hydrocarbon accumulation
Hydrocarbons
Middle East
Oil and gas fields
Physical properties
pore-throat structure
Reservoirs
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Summary:The fluid distribution is considerably influenced by the reservoir homogeneity. This study analyzes carbonate reservoir heterogeneity and hydrocarbon accumulation processes in the Khasib reservoirs in AB oilfield in the Middle East to discuss factors controlling the distribution of fluid and the effects of this distribution on the productivity of single wells. The Khasib reservoirs in the AB oilfield show uniform vertical distributions, with a large difference in the longitudinal pore throats, and the upper part of the reservoir is better than the lower one. Because the hydrocarbon accumulation is multiphasic, the heterogeneity of crude oil is based on whether traps are formed in the early or late stage of source rock formation during accumulation. Moreover, the longitudinal physical differences in crude oil properties are mainly attributed to the longitudinal differences in the pore throats. The difference in the pore throat and physical properties of crude oil affords differences in the productivity of horizontal wells in different subzones.
ISSN:2391-5447
2391-5447
DOI:10.1515/geo-2022-0363