DIFFERENTIAL TECTONIC ACTIVITIES IN PALEOCENE-EOCENE AND ITS BEARING ON THE EVOLUTION OF SEDIMENTARY FILLINGS IN THE SOUTHWEST BOZHONG SAG
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摘要:
渤海海域渤中凹陷西南部构造复杂，其沉积充填演化规律不明确。综合运用岩芯、测井以及三维地震资料，对该区断陷湖盆古新世—始新世的构造活动、沉积体系以及盆地充填演化规律进行了系统研究。研究表明，渤中凹陷西南部古近纪孔店-沙河街组发育孔店组末期、沙三段末期、沙一二段末期等3期构造活动，多次隆升剥蚀形成3个关键层序界面，控制整个湖盆古近纪孔店-沙河街组的层序结构和古地貌形态。古新世—始新世主要发育近源扇三角洲、辫状河三角洲、湖泊以及湖底扇等4种沉积体系类型，其分布受古物源、古地貌、断裂活动等因素制约。在古新世孔店组沉积裂陷早期，湖盆范围小，物源供给充足，陡坡带和缓坡带均以发育扇三角洲沉积为主，湖盆中心发育湖底扇沉积，晚期湖盆逐渐萎缩；始新世早期的沙三段沉积时期，断陷活动加强，随着盆地范围的扩张，物源供应减弱，湖盆洼陷区主要发育湖底扇沉积。始新世晚期沙一二段裂后沉降期，辫状河三角洲进积特征明显，分布范围广，局部地貌高位置发育湖相碳酸盐岩沉积。不同时期构造差异活动与物源供给共同制约着该区古近纪孔店-沙河街组的沉积充填演化过程，也导致了与渤海海域其他构造区沉积充填的差异性。
Abstract:The evolution of sedimentary fillings in the southwest Bozhong Sag are not so clear up to date. This time, tectonic activities, sedimentary systems and evolution history of fillings in the faulted lake basins of this area are integrated and systematically studied by means of cores, well logs and 3D seismics. 3 tectonic activities were recognized in the Paleocene-Eocene deposits in the tectonic-inversion area of the southwest Bozhong Sag. As the results, three key sequence interfaces formed by uplifting and denudation were discovered, which controlled the sequence structure of the lake deposits in the Kongdian-Shahejie Formations. There are four types of sedimentary facies, i.e the fan delta, braided river delta, lacustrine and sublacustrine fan, of which the distribution patterns are controlled mainly by provenance, paleogeomorphology, faulting and other factors. In the early rifting stage of Kongdian Period, small lake basins occurred with adequate source supply, all the steep and gentle slope belts were predominated by fan-delta sediments. In the centers of lake basins, however, there laid down sublacustrine fan deposits. Lake basins gradually shrank later on. During the third stage of Shahejie Period, the subsiding of the basin was accelerated, and with the expansion of the basin area, the supply of the source was no longer sufficient, and the sublacustrine fans were mainly developed in the depressions of the lake. In the post- rifting subsidence period in the first and second stages of the Shahejie Period, the braided river deltaic deposits became widely distributed, and lake carbonate deposits might occur on some local geomorphic highs. The differential tectonic activities and sediments supply constrained the evolution of the sedimentary fillings of the region, and such a differentiation of sedimentary fillings may also occur in other tectonic areas of the Bohai Sea.
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