歧口凹陷沙河街组一段中部区域盖层封气能力综合评价

doi:10.11743/ogg20110505

Abstract

Abstract:

Regional seal in middle of the first member of Shahejie Formation in Qikou Sag was comprehensively evaluated by using single well and gas reservoir data.The results show that the caprock was generally thick and continuous,and thus has relatively strong microscopic sealing ability.However,in the Beidagang buried hill structure belt and northern Banqiao depression,the reservoir pressure coefficient is relatively large and the displacement pressure of fault rock is relatively low due to the large vertical displacement of major faults in the caprock,being unfavorable for the preservation of gas.Based on four parameters including caprock thickness,displacement pressure,pressure coefficient of gas reservoir and vertical sealing ability of faults,a comprehensive evaluation method was proposed and used to evaluate the sealing ability of caprock in Qikou Sag.The results show that the caprock in most areas of Qikou Sag can seal gas reservoirs with medium to low reserves abundance and can seal gas reservoirs with high reserves abundance in central depression.

Key words: sealing ability, reserves abundance, favorable area, regional caprock, Shahejie Formation, Qikou Sag

CLC Number:

TE122.2

Shi Jijian, Fu Guang, Lü Yanfang, Li Lili, An Zhenyue, Zhu Na'na. Comprehensive evaluation of regional seal in the middle of the first member of Shahejie Fm in the Qikou Sag[J]. Oil & Gas Geology, 2011, 32(5): 671-681.

References

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Comprehensive evaluation of regional seal in the middle of the first member of Shahejie Fm in the Qikou Sag

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