The Sifangtai and Mingshui formations were continuously cored in the SK-1 n borehole（China Cretaceous Continental Scientific Drilling-SongKe1-the north borehole）.The core is 767.96 m long,and the recovery is 94.7%.T...The Sifangtai and Mingshui formations were continuously cored in the SK-1 n borehole（China Cretaceous Continental Scientific Drilling-SongKe1-the north borehole）.The core is 767.96 m long,and the recovery is 94.7%.The ages of the formations range from middle Campanian to Danian.The sequence and process of lithology-lithofacies and cyclic stratigraphy were described in detail.Eight litho-types compose the Sifangtai Formation,and 15 litho-types compose the Mingshui Formation.Deposition was predominantly in meandering river and lacustrine environments,including 10 microfacies in the Sifangtai Formation and 15 microfacies in the Mingshui Formation.The complete sequence is composed of 535 m-scale cycles（sixth-order cycle）,152 fifth-order cycles,42 fourth-order cycles and five third-order cycles.The centimeter-scale description of the section revealed some previously unknown horizons such as a special type of mudstone,marl,volcanic ash and favorable sand reservoirs in the formations.The new-found evidence is very important for the interpretation of the evolution of the basin,conditions such as lake oxic events,the K/Pg boundary,tectonism in the late sag basin stage,and the reservoir-cap rock assemblages in the shallow stratigraphy.展开更多
The Songliao Basin,the biggest Cretaceous oil-gas producing lacustrine basin in northeast China,contains the giant Daqing Oilfield situated in the central part.Lacustrine setting dominated the basin during the Cretace...The Songliao Basin,the biggest Cretaceous oil-gas producing lacustrine basin in northeast China,contains the giant Daqing Oilfield situated in the central part.Lacustrine setting dominated the basin during the Cretaceous period.The SK-I drilling,located in the northern central part of the Songliao Basin,was completed in 2007 and is supposed to be a possible breakthrough in lake investigation.展开更多
Scientific drilling is a significant exploration tool to better understand earth’s environmental and biological evolution,physical composition and structure,and natural resources and geohazards,through directly sampl...Scientific drilling is a significant exploration tool to better understand earth’s environmental and biological evolution,physical composition and structure,and natural resources and geohazards,through directly sampling on subsurface rock,fluid,living organisms and long-term monitoring of on-going deep processes.It plays a critical role in deciphering earth system dynamics and in solving socio-economic problems currently facing by humans.展开更多
基金supported by the National Basic Research Program of China(Grant No.2012CB822002)the National Natural Science Foundation of China(Grant No.41202072)the "Key Laboratory of Northeast Asia biological evolution and environment of Ministry of Education" platform base construction project
文摘The Sifangtai and Mingshui formations were continuously cored in the SK-1 n borehole（China Cretaceous Continental Scientific Drilling-SongKe1-the north borehole）.The core is 767.96 m long,and the recovery is 94.7%.The ages of the formations range from middle Campanian to Danian.The sequence and process of lithology-lithofacies and cyclic stratigraphy were described in detail.Eight litho-types compose the Sifangtai Formation,and 15 litho-types compose the Mingshui Formation.Deposition was predominantly in meandering river and lacustrine environments,including 10 microfacies in the Sifangtai Formation and 15 microfacies in the Mingshui Formation.The complete sequence is composed of 535 m-scale cycles（sixth-order cycle）,152 fifth-order cycles,42 fourth-order cycles and five third-order cycles.The centimeter-scale description of the section revealed some previously unknown horizons such as a special type of mudstone,marl,volcanic ash and favorable sand reservoirs in the formations.The new-found evidence is very important for the interpretation of the evolution of the basin,conditions such as lake oxic events,the K/Pg boundary,tectonism in the late sag basin stage,and the reservoir-cap rock assemblages in the shallow stratigraphy.
文摘The Songliao Basin,the biggest Cretaceous oil-gas producing lacustrine basin in northeast China,contains the giant Daqing Oilfield situated in the central part.Lacustrine setting dominated the basin during the Cretaceous period.The SK-I drilling,located in the northern central part of the Songliao Basin,was completed in 2007 and is supposed to be a possible breakthrough in lake investigation.
基金supported by the National Natural Science Foundation of China(41790450)the China Geological Survey Program(DD20189702 and DD20160207)
文摘Scientific drilling is a significant exploration tool to better understand earth’s environmental and biological evolution,physical composition and structure,and natural resources and geohazards,through directly sampling on subsurface rock,fluid,living organisms and long-term monitoring of on-going deep processes.It plays a critical role in deciphering earth system dynamics and in solving socio-economic problems currently facing by humans.
