Fault Sealing Capacity and Relationship with Oil-gas Accumulation at Baodao Northern Slope
Received date: 2012-08-21
Revised date: 2012-10-02
Online published: 2013-04-10
Based on the newest oil & gas exploration data of Baodao Northern slope in the Qiongdongnan basin,through oil-gas geochemical comparison of area A and area B,the regional fault sealing capacity was evaluated by Knipe triangle map and fault opening index (FOI).Finally combined with the oil-gas accumulation period,stage of fault activity,sedimentary facies and some other geological factors,influence of the fault closure in the northern slope of Baodao on regional oil and gas migration and accumulation was evaluated.The faults connecting source rock with reservoirs are favorable paths for oil & gas vertical migration,and they have segmented sealing capacity.It is the segmented sealing capacity of faults that result in different oil-gas migration and accumulation modes in area A and area B,which is also the reason of the differences properties of the oil-gas in the gas reservoir.The results show that natural gas in area A has high level of heavy hydrocarbon,low level of non-hydrocarbon,light carbon isotope and the gas condensate without dicadinane and 4-methyl-steranes,which is significantly different from the gases in area B.The faults are active mainly during depositional period of Sanya Formation,which means the faults are static at the peak stage of oil-gas migration.
ZHANG Xin-shun,HUANG Zhi-long,FAN Cai-wei,WU Hong-zhu,XU Xin-de,LI Mei-ning . Fault Sealing Capacity and Relationship with Oil-gas Accumulation at Baodao Northern Slope[J]. Natural Gas Geoscience, 2013 , 24(2) : 356 -364 . DOI: 10.11764/j.issn.1672-1926.2013.02.356
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