APreliminaryStudyonTectonicSequenceStratigraphy-汉斯出版社.PDF

Advances in Geosciences 地球科学前沿, 2014, 4, 51-66 Published Online April 2014 in Hans. /journal/ag /10.12677/ag.2014.42008 A Preliminary Study on Tectonic Sequence Stratigraphy for the Lower Cretaceous in the Tanan Sag, Tamsag Basin, Mongolia 1 1 1 2 1 1 1 Xiaodong Sun , He Liu , Chunbai Li , Genyao Wu , Qiang Li , Ge Zhang , Geng Gao , 1 1 1 Defeng Zhu , Jinkui Wang , Shaojun Liu 1 Exploration and Development Research Institute of Daqing Oilfield Ltd., Daqing 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing Email: xiaodongsun@ th th nd Received: Jan. 16 , 2014; revised: Feb. 20 , 2014; accepted: Mar. 2 , 2014 Copyright © 2014 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract Based on the drilling data, seismic reflecting horizons, together with sedimentological achieve- ments, in the light of the tectonic sequence stratigraphy, the sequences in the Lower Cretaceous of the Tanan Sag are studied and discriminated. The Tongbomiao Formation, as deposits of the initial rifting stage and being divided into two members lithologically, is correlated to two third-order sequences (SQ1 and SQ2). The Nantun Formation, record of the main rifting stage, is correlated to third-order sequence SQ3, in which three forth-order sequences (Sq31, Sq32 and Sq33), and fur- thermore, seven fifth-order sequences, are identified. The superface of Sq32 repre