Accommodation Mechanics of Terrigenous Sequence Development in Fault-depressed Lacustrine Basin——A Case Study: the Upper Member of Eh3, Shuanghe-Zhaoao, Biyang Fault-depression
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摘要: 泌阳断陷湖盆基底呈“反铰链式”构造沉降。在湖平面变化和构造沉降共同作用下，泌阳断陷湖盆陡坡带的可容空间变化仅有三种可能性：ａ．南缘及北缘减小，中央带增加；ｂ．南缘不变，中央带及北缘增加；ｃ．南缘、中央带及北缘均增加。针对这三种情况，分别在不同的物源供给速率条件下，分析了断陷湖盆陡坡带不同构造部位的剩余可容空间变化规律及沉积响应特征。文中探讨了参照井选择的可容空间机理；以泌207井作为参照井，对下第三系核三上段的陆相层序进行了划分；并采用Fischer图解法，作出了其实际可容空间变化曲线。Abstract: In Biyang fault-depressed lacustrine basin, the tectonic descent of basement presented antihinge-typed subsidence. Due to the joint effect of lacustrine level change and basement structural subsidence, accommodation change in the steep slope zone of Biyang fault-depressed lacustrine basin only have three possibilities: a. decreasing at southern and northern rim zone but increasing in central zone; b. beingin-variant at southern rim zone but increasing in central zone and at northern rim zone; c. all increasing at southern and northern rim zone and in central zone. In the light of the three cases, the sedimentation-re-sponsed charteristics to the accommodation variation law at different structural positions of the steep slope zone in fault-depressed lacustrine basin have been respectively analy sed at different recharge rate of sediment-source. In this paper, accommodation mechanics to select reference well has been discussed; and by using well B207 as reference well, the terrigenous sequences of the upper member of Eh3 have been di-vided; and by using Fischer diagram, the realized accommodation change curve of the terrigenous se-quences is acquired.
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