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断陷盆地砂砾岩体的发育特征——以沾化凹陷埕南断裂带下第三系沙三段为例
石油与天然气地质
2001年 22卷 第No.1期
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Title
DEVELOPMENT CHARACTERISTICS OF SAND-CONGLOMERATE BODIES IN FAULT-DEPRESSED BASINS:TAKE EOGENE SHA-3 MEMBER IN CHENGNAN FAULT BELT AS AN EXAMPLE
摘要
沾化凹陷埕南断裂带沙三段中可识别出7个向上变浅的沉积旋回.这些沉积旋回是古水深和湖平面相对升降变化的沉积记录.在分别假定构造持续匀速沉降和气候保持温暖潮湿条件下,从沙三段沉积时的水位相对升降变化四级周期曲线可分解出构造沉降和气候变迁所引起的水位升降变化分量.其中,构造沉降分量远远大于因气候变迁引起的沉降分量.由此不难看出:(1)若断裂活动的旋回周期与气候变化周期同步,则两者对砂砾岩体的发育都有影响,为双重驱动,但断裂活动的贡献更大;(2)若两者不同步,砂砾岩体的形成主要受断裂活动的控制.
Abstract
Seven sedimentary cycles could be distinguished in Tertiary Sha-3 member of Chengnan fault belt in Zhanhua Sag which recorded the changes of paleo-water levels.It is constant that the changes of water level caused by tectonic subsidence are bigger than that caused by climate.This suggests that:if faulting cycle and climate variation cycle synchronize perfectly,they are both helpful for the development of sand-conglomerate;if they do not synchronize,the development of sand-conglomerate is mainly controlled by faulting.
关键词：
断陷盆地;
砂砾岩体;
成因模式;
沉积旋回;
气候旋回;
断裂活动;
Keywords:
fault-depressed basin;
sand-conglomerate body;
genetic model;
sedimentary cycle;
climate cycle;
faulting;
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