The Tarim Basin Sinian Sedimentary System And Lithofacies-paleogeographical Research

In the full collection, sorting many previous studies on the outcome of the Sinian in Tarim Basin, based on full use of the basic principles and methods of sedimentology to the field geological section, drilling and logging data, combined with the seismic profiles, in the region Based on the tectonic setting of sedimentary basin of the Sinian system types, characteristics and lithofacies palaeogeography systematic, in-depth study. Section through the Field profiles, drilling cores, logging data analysis, the Sinian in the Tarim Basin identified a total of 2 types of depositional systems group, and 5 types of depositional systems, respectively, marine carbonate sedimentary systems group platform depositional system, coastal depositional system, shelf depositional system and gravity flow deposition system, the transition of land and sea depositional systems group delta system Which littoral sedimentary system to non-barrier coast of foreshore and near shore sediment barrier coast dominated and tidal flat deposits. Shelf depositional system performance for the two forms, one dominated by clastic sediments of the normal continental shelf deposit, the other is a mixed clastic and carbonate deposition dominated the mixed product shelf。Carbonate platform depositional system with limited platform and open platform facies is dominant.In the sedimentary system types, characteristics of the basis of established Sinian sedimentary basin model, including two models. Way for the shore - shelf - deep-sea depositional model, mainly developed in the Lower Sinian; another way for the carbonate platform depositional model, mainly developed in the Upper Sinian.Finally, according to the characteristics of sedimentary system type, and evolution, sedimentary facies pattern, combining the characteristics of regional tectonic background in the lower sinian system of upper sinian and sedimentary period, reflecting the paleogeographic map in different periods of the face Tarim Basin, southwestern edge of the next Sinian to shore - continental shelf - the main basin, in the northern Tarim Basin, northwest edge to Barrier coast tidal flat deposits, the eastern Tarim Basin to Delta - the main continental shelf sediment , most of the Tarim Basin in Central District for the uplift of the erosion. Upper Sinian in the next Sinian sedimentary patterns on the basis, with the sea-level rise, In the southwest margin of tarim basin in coastal deposits to the shelf; Northwestern margin of the Tarim Basin, central and eastern to the restricted platform carbonate platform deposits in the Tarim Basin in northern zones, the main open platform deposition, south-central region in the Tarim Basin, uplift and erosion areas.