Data for: Source-to-Sink Analysis in an Eocene rifted lacustrine basin margin of Western Shaleitian Uplift area, Offshore Bohai Bay Basin, Eastern China
Description
Paper 1: We analysed the characteristics of the provenance and sediment-dispersal patterns of the beach and bar systems in the Palaeogene third-order sequence framework on the basis of detritus, thin section, zircon and the geophysical response test data. In the 3D seismic area, the features of the beach and bar sedimentary systems were described and interpreted based an analysis of the well-based sedimentary facies, seismic reflection characteristics and multiple attribute clustering. The results show that the beach and bar systems by the short-axis braided deltas mainly developed in the upper member of E2w and that the beach and bar systems on the subaqueous high in E3e developed during the Palaeogene. Paper 2: Using lithology, wire-line logs and three-dimensional (3-D) seismic data in the southern slope of Zhanhua Sag, we demonstrated the utility of stratal slice images for analyzing facies architecture and sediment-dispersal characters of complex depositional systems in Es3. On the basis of an integrated analysis of well log, core data, seismic facies based on multi-seismic attributes, three depositional environments (e.g., “fan-delta”, “shallow lacustrine” and “turbidite” facies) have been recognized. Stratal slices indicate that the depositional environments of these sequences evolved from gravel- or sand-rich fan delta and turbidite to lacustrine mud, and lastly to mixed sand-mud fan delta systems. The results of high resolution 3-D depositional systems analysis showed that the third-order sequence located in different systems tracts of the para-second-order sequence would contribute to their systems tracts with the different types and scales of depositional systems. Paper 3: Seismic stratal slices reveal different characteristics of channels and fan-delta lobes between the south (slope break belt) and southwest (gentle slope) areas combined with lithology, wire-line logs and three-dimensional (3-D) seismic data in the southern slope of Zhanhua Sag. And an excellent analogue has been provided for understanding various key depositional evolution of fan-deltas in the slope system (from base to top: Es3 L, Es3 M and Es3 U).