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Sedimentary facies, sequence stratigraphic patterns in pre-Cenezoic inland compressional basin: Example from early Yanshanian succession of eastern Yihezhuang salient, Jiyang depression, Bohai Bay basin, China

Guangzeng Song* 1,2, Hua Wang3, Meng Xu4, Jinda Xu5
1. School of Resources and Environment, University of Jinan, Jinan 250022, China; 2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China; 4. No.1 Institute of Geology and Mineral Resources of Shandong Province, Jinan 250014, China; 5. Geological Surveying & Mapping Institute of Shandong Province, Jinan 250011, China

Abstract:To improve the success rate of locating hydrocarbon reservoirs in pre-Cenezoic inland compressional basins, taking the early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the sedimentary facies and sequence stratigraphic patterns. First, through seismic profiles, well logs, cores and outcrops, the sequence framework was established and internal sedimentary facies got identified. Further, according to analysis of single-wells and connecting-wells, the vertical evolution and horizontal distribution of sedimentation inside the sequence frameworks were discussed. The following results were acquired: (1) meandering river characterized by dual structures superposing each other got developed, and the dual structures can be further divided into three kinds; (2) the entire early Yanshanian succession was interpreted as one first-order sequence, composed of three third-order sequences, including SQ-Fz1, SQ-Fz2 and SQ-St from bottom to top. Each third-order sequence can be further divided into three system tracts; (3) in different system tracts, different types of dual structures developed separately, and sedimentary bodies showed different horizontal distribution scales and vertical superposition patterns. Finally, the model of sequence stratigraphic patterns was established. This study enhanced the use of sequence stratigraphy to inland tectonically active basins, and would be helpful to predict reservoirs in pre-Cenezoic residual basins.

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Keywords:early Yanshanian succession; sequence stratigraphic patterns; inland compressional basin; meandering river; dual structure

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