JZS油田潜山裂缝储层形成机制及分布预测

doi:10.11743/ogg20110509

Abstract

Abstract:

According to litho-chemical index and microscopic features,the buried hill in JZS oilfield can be divided vertically from top to bottom into three zones with different levels of chemical weathering:weathered,semi-weathered and un-weathered zones.Similarly,based on core observation,thin section analysis and image logging and in combination with production logging data,it also can be divided into three zones from surface to core:weathered crust,semi-weathered crust and basement,corresponding to the three chemical weathering levels respectively.The reservoir space of buried hill is dominated by structural fractures in semi-weathered crust and the solution fractures in weathered crust.The development of fracture reservoir is controlled by multiple factors such as lithology,tectonic movement,weathering and dissolution,of which tectonic movement is the main controlling factor.According to the timing of faults and their dip angle,the structural fractures of buried hill in JZS can be grouped into four types:early semi-filled/filled horizontal fracture,early semi-filled/filled vertical fracture,late semi-filled cataclastic fracture and late open slant fracture.By using crude oil inclusion detection technique,we recognized that the main effective fracture types of the buried hill in JZS are late semi-filled cataclastic fracture and late open slant fracture.We also established criteria for identifying effective fractures with conventional logging data calibrated by core and image logging data and restructured a new effective structure identification curve for fractured reservoir inversion and distribution prediction.Application shows that the prediction results of this method correlate well with that of other geophysical methods.This method provides the neccesary geological basis for development well emplacement.

Key words: fractured reservoir, formation mechanism, reservoir prediction, metamorphic rock buried hill, Archaean, Liaoxi low uplift, Bohai Sea

CLC Number:

TE122.2

Huang Baogang, Wang Libing, Zhao Chunming, Yang Qinghong, Cao Shuchun, Tong Kaijun, Song Hongliang. Formation mechanism and distribution of fractured buried hill reservoir in JZS oilfiled[J]. Oil & Gas Geology, 2011, 32(5): 710-717.

References

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Formation mechanism and distribution of fractured buried hill reservoir in JZS oilfiled

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