松辽盆地三肇凹陷向斜区白垩系姚家组葡萄花油层油水分布特征及其主控因素

doi:10.11743/ogg20180603

Abstract

Abstract: The volume of oil and gas in the syncline area of Sanzhao Sag,Songliao Basin,is sizable.It’s hard,however,to make clear the complicated oil-water distribution in Putaohua reservoir,and so far its controlling factors are rarely known.Reservoir types discovered and their distribution patterns were investigated,controlling factors of hydrocarbon accumulation were analyzed,and the main controlling factors of oil-water distribution in the syncline area of the prolific sag were discussed,by using the abundant static data and performance data of the mature development blocks of the oilfield.The results show that (1) oil-water distribution of Putaohua reservoir in the syncline area is controlled by a single trap composed of local structure and single sand body,the oil-water interface of a single trap is unified,but the oil-water distribution patterns vary for different single traps adjacent. (2) In a single trap, the oil-water distribution in the syncline area is controlled by the patterns of hydrocarbon accumulation and superimposition:complex spatial superimposition of single traps with and without hydrocarbons ultimately results in the complexity of hydrocarbon accumulation and oil-water distribution in the syncline area,Sanzhao Sag. (3) The superimposition of traps that are composed of vertically multi-layered and laterally multi-branched single sand bodies and complicated local structures with non-traps is the main controlling factor of oil-water distribution in the syncline area.Therefore, reservoir prediction in the syncline area should begin with the analysis of elements of irregular geologic body controlling hydrocarbon accumulation,that is,the evaluation of faults,single sand bodies and their spatial assemblage.

Key words: hydrocarbon accumulation in syncline, single trap, oil-water distribution, hydrocarbon accumulation pattern, Putaohua reservoir, Songliao Basin

CLC Number:

TE122.2

Sun Yu, Yu Limin, Yan Baiquan, Liu Yunyan, Cong Lin, Ma Shizhong. Oil-water distribution and its major controlling factors of Putaohua reservoir of the Cretaceous Yaojia Formation in syncline area of Sanzhao Sag,Songliao Basin[J]. Oil & Gas Geology, 2018, 39(6): 1120-1131.

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Oil-water distribution and its major controlling factors of Putaohua reservoir of the Cretaceous Yaojia Formation in syncline area of Sanzhao Sag,Songliao Basin

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