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Sequence Stratigraphic Delineation and Correlation of the Dongying Formation in the Nearshore and Adjacent Sea Areas, Bohai Bay Basin |
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| Authors: | Zhu Hongtao Du Yuansheng Liu Keyu Yan Jiaxin Xu Yajun Yang Ping Liu Xinyu |
| Institution: | 1. Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China;CSIRO Petroleum Resources,PO Box 1130,Bentley,WA 6102,Australia 2. CSIRO Petroleum Resources,PO Box 1130,Bentley,WA 6102,Australia 3. Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China 4. CSIRO Petroleum.Resources,PO Box 1130,Bentley,WA 6102,Australia |
| Abstract: | Based on the analysis of well logs, seismic data, core studies, the Dongying (东营) into three third-order sequences from base to top: namely, sequences SQ1, SQ2 and SQ3. The three sequences have different wireline (SP) log responses, showing triple-section characteristics with SQ1 being characterized by primarily flat baseline with intercalation of relatively low spontaneous potential, SQ2 generally exhibiting weak or moderate amplitude spontaneous potential with finger-shaped peaks, and SQ3 having relatively high spontaneous potential with funnel-shaped log curves. On the basis of the triple-section characteristics, the stratigraphic sequences can be correlated consistently throughout the entire study area. A stratigraphic and sedimentary model for sequences SQ1 to SQ3 of the Dongying Formation in the study area has been proposed. The accommodation space change in the two sides of the asymmetrical basin was examined and the asymmetrical basin has the feature of the asymmetrical accommodation space change. The asymmetrical physiography is a vital factor to influence the accommodation changes in additional to the lake level change, tectonism and sediment supply. This may have important implications to similar basins in other parts of China or elsewhere. |
| Keywords: | Bohai Bay basin Dongying Formation sequence stratigraphy consistent correlation asymmetrical basin |
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