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《Natural Gas Industry》 2012-07
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Relationship between sequence stratigraphy and tight gas pooling in the 4th member of the Lower Cretaceous Yingcheng Formation,Xujiaweizi fault depression

Huang Wei,Xiao Lihai,Lu Jiamin,Yin Changhai(Exploration and Development Research Institute of Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163712,China)  
Tight sandy conglomerate reservoirs in the 4th member of the Lower Cretaceous Yingcheng Formation,Xujiaweizi fault depression,Songliao Basin,are potential targets of deep gas exploration.In order to predict play fairways there,high-resolution sequence stratigraphic methods were used to study the relationship between sequence stratigraphy and tight gas pooling.First,according to the features of stratigraphic development,cyclicity and petrographic facies,the 4th member of the Yingcheng Formation was divided into 2 third-order sequences with each having its own specific seismic responses,logging responses and sedimentological markers.On this basis,a sequence stratigraphic framework is then established for this study area.The lower sequence(Sq1) only occurs in the central part of the fault depression where semi-deep lake-fan delta front subfacies are developed,where quality source rocks are dominated by dark mudstones with sufficient hydrocarbons supplied to the overlying 4th member of the Yingcheng Formation.In contrast,the upper sequence(Sq2) is braided river delta front subfacies with good poroperm characteristics favorable for the development of quality reservoirs.Finally,two modes of hydrocarbon pooling are established for this study area.The first is the lower source rock with upper reservoir mode in which source rocks are in the underlying Shahezi Formation,faults act as migration pathways,and sandy conglomerate volcanic rocks are reservoirs.For this kind of hydrocarbon pooling mode,the play fairways are located in Xingcheng,Xudong and Xunan areas with estimated original gas in place(OGIP) of 45 billion m3.The other is the indigenous-sourcing mode or the lower source rock with upper reservoir mode in which source rocks are the dark mudstones in Sq1 and reservoirs are mainly the sandy conglomerate in Sq2.For this kind of hydrocarbon pooling mode,the representative play fairways occur in the XS22 wellblock in the center of fault depression with the estimated OGIP of about 10 billion m3.
【Fund】: 国家科技重大专项子课题“大型特大型岩性地层油气田(区)形成与分布研究”(编号:2011ZX05001-001)
【CateGory Index】: P618.13
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