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| PubMed | |
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Article by Hu, X. Q. |
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Article by Shen, Y. J. |
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Article by Gao, D. |
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Article by Wang, G. Y. |
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Article by Cheng, R. H. |
���ƺ����λ����³��ɽ��—�ٽ���ɽ���뽺—��¡��֮�䡣��ػ���Ϊһ����¡���깲 6 ���������쵥Ԫ�����ж�������������������٪��ͳ—�°���ͳ�ز㣬��½�����Ϊ��������Ϊ 8 ������������٪��ͳ���� 2 ����������Ϊ���Ź��챳���µ����ϱ�ϸ��������; ��٪��ͳ���� 2 ����������������Ϊ����- - ���췴ת�����µ����ϱ�ϸ���С�����٪��ͳ������ĩ����ѹ���쵼�²��ֵز����ܰ�ʴ���°���ͳ���� 4 �����������ܼ�ѹ������ƣ������ز��ʴ���أ��ֲ�ȱ�ٲ����꾮 B32 �� B21 �IJ⾮���Ϸ�������Ϊ Th/U ��ֵ������Ч�Աȣ����ֶԱȴӹ�ˮ��ͺ�ƽ��仯������֤����ص�����- - ��ѹ������ݻ������������ݻ�ʷ���������˵�����ƺ���ض������ݵij����������ͷֲ��ܹ������ʵ�Ӱ�죬ͬʱҲ˵�������ת����չ���챳�����ݻ�������
The North Yellow Sea is located amongst the sulu orogenic belt��linjin river orogenic belt and jiao- liao uplift�� The basin is divided into 6 secondary structure units which contain one depressed structure��two uplifts structure and three sags�� Formations include middle Jurassic��upper Jurassic and lower cretaceous in the eastern depression�� The sedimentary sequences were formed in continental environment�� The basin filling succession can be classified into 8 third order sequences��and 2 of them are upward- fining sedimentary succession in extension tecton- ic background��in middle Jurassic�� There are 2 third order sequences in upper Jurassic��which are upward- fining sedimentary succession in extension- inversion tectonic background�� Compressional structure facilitated strata erosion in the late Jurassic�� There are 4 third order sequences in lower cretaceous��controlled by compressional structure�� The strata was eroded seriously and partial sequences missing�� Logging data analysis of the Well B32 and Well B21 draw a conclusion that Th/U ratio of these 2 wells could be compared effectively��and the basin evolution of exten- sion structure -compressional structure were proved in terms of the paleo- water- depth and the sea level change�� The structural evolution section analysis considered that the sequence development and distribution were affected by tec- tonic activity��and the basin evolution characteristics of transform structure- extensional structure were proved��