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Base Level Cyclic Controls on the Fluvial Reservoir Physical Properties and Sonic Logging Response
详细信息   
摘要


     To identify the influence of base level cycle on the differences of the fluvial reservoir physical properties and logging response among the same type of microfacies in different stages of base level cycle,the main controlling factors on the fluvial reservoir physical properties of the channel in the upper member of Guantao Formation of Gudao oilfield are analyzed based on the sediment dynamic analysis of the high resolution stratigraphic sequence and the quantitative analysis of the core testing,statistical data.The control mechanism of base level cycle on the differences of the reservoir differences and logging response among the channel in different stages of base level cycle is identified.The pattern of the reservoir differences and logging response among the channel in different stages of base level cycle is confirmed.The results show that the diversity of sedimentary environment of channel in different stages of base level cycle causes the variation of accommodate space and sediment supply due to the changes of the base level in different scales,the reservoir quality of the upper part of the single channel in short-term base level cycle is lower than that of the basal part,and the logging response of single channel is similar.The reservoir quality of the upper part of the compound channelformed by different single channelsin middle-term base level cycle is lower than that of the basal part,and the logging response of different single channel is distinct.The reservoir property and logging response among compound channel in the different stages of long-term base level cycle is distributed irregularly.

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