Control mechanisms of tectonic paleogeomorphology on the Early Cretaceous sedimentary basin fills in Ta'nan sag,Tamtsag Basin,Mongolia
Zhou Yong1,2, Ji You-Liang1,2, Meng Qi-An3, Wan Hong-Feng1,2, Zhang Ge3, Ren Yu-Tao1,2, Yan Ke-Xin1,2, Liang Tao1,2, Chen Fu-Yu1,2, Qiang Zhi-Cheng1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 3 Daqing Oilfield Limited Company,Heilongjiang Daqing 163000,China
Abstract：The Ta'nan sag is a typical faulted lacustrine basin formed during the Early Cretaceous,which experienced multi-stage episodic faulting activities. Tectonic activities are an important factor for the formation of paleogeomorphology and sand distribution. However,the controls of paleogeomorphologies generated by synsedimentary tectonic activities on sequence architectures,sedimentary system and sand body distribution are still unclear. Based on seismic,well logging and core data,under the guidance of sequence stratigraphy theory and paleogeomorphic sand control theory,the sequence-stratigraphic frameworks of the Lower Cretaceous in the Ta'nan sag are established. Combined with the analysis of the major fault activity during different rifting stages,the controlling effects of different paleogeomorphologies on sedimentary system and sand body distribution are clarified. The investigation of the tectonic evolution and sediment fill of the Ta'nan sag during the Early Cretaceous suggests that the episodic rifting and various activities of major faults created complex paleogeomorphologies including transfer zones and structural slope-break zones,which significantly controlled the development and distribution of both depositional systems and sand bodies. The transfer zones including transverse uplift and relay ramp were the sites for drainage catchment,and controlled the locations of sedimentary provenances,entry points of sedimentary material into the basin,and the resultant development of depositional systems. According to fault geometry and the location of the slope-break zones,the structural slope-break zones of the Ta'nan sag during the climax rifting stage were subdivided into four types: fault scarp zone,fault terrace zone,gentle slope zone and intrabasinal fault break zone,which played significant roles in controlling the changes in accommodation and the distribution of depositional systems and sand bodies. Three syndepostional fault arrangement patterns were identified according to their distribution on the structural map,which are “comb-like”,“fork-like and “parallel”faults. Areas where the structural slope-break zone overlapped with transfer zones are sites for major drainage systems and the optimum locations of fan deltas and sublacustrine fans. The sand bodies deposited here are favorable targets for the exploration of litho-stratigraphic traps in the Ta'nan sag. The results have important theoretical significance and practical value for deepening the theory of source-to-sink system and guiding the prediction of sand body distribution in faulted lacustrine basins.
Zhou Yong,Ji You-Liang,Meng Qi-An et al. Control mechanisms of tectonic paleogeomorphology on the Early Cretaceous sedimentary basin fills in Ta'nan sag,Tamtsag Basin,Mongolia[J]. JOPC, 2022, 24(3): 493-511.
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