Gas Sealing Limit of Faulted Thickness of Caprock and Its Controlling Effect on Gas Distribution：An Example from Xujiaweizi Depression of Songliao Basin
Received date: 2013-10-28
Revised date: 2014-02-17
Online published: 2014-07-10
Based on the study of development and distribution characteristics of transporting faults and caprocks,gas sealing limit of faulted thickness of caprocks and its controlling effect on gas distribution were studied through the analysis of the relationship between the space matching between fault and caprock and the gas distribution.The result indicates that the volcanic caprock in the top of K1yc1 was destroyed by transporting fault seriously and has bad distribution continuity.Its gas sealing limit of the faulted thickness is about 2m.Destruction level of transporting fault on the mudstone caprock of K1d2 is low,and its distribution continuity is good.The gas sealing limit of faulted thickness is about 67m.Controlling effect of gas sealing limit of faulted thickness of the two caprocks on the gas distribution in Xujiaweizi depression is shown in following three aspects:(1)Gas only distributes under caprock in sealed areas.The gas mainly distributes in the middle and south of Xuzhong fault,the middle and south of Xudong fault and the north of Xuxi fault.(2)Gas distributes over and under caprock in unsealed areas .These gases mainly distribute in the north of Xuzhong fault and the middle and north of the south of Xuxi fault.(3)Gas accumulation in sealed areas is more abundant than that in unsealed areas.
Key words： Caprock; Faulted thickness; Gas sealing limit; Gas distribution; Controlling
FU Guang,LI Na,HU Ming . Gas Sealing Limit of Faulted Thickness of Caprock and Its Controlling Effect on Gas Distribution：An Example from Xujiaweizi Depression of Songliao Basin[J]. Natural Gas Geoscience, 2014 , 25(7) : 971 -979 . DOI: 10.11764/j.issn.1672-1926.2014.07.0971
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