Segmental Differences and Driving Mechanisms of Sequence Architecture in Early–Middle Ordovician Platform Margin, Tarim Basin
Source abstract
Abstract
The Ordovician platform margin belts in the Tarim Basin are key targets for deep carbonate hydrocarbon exploration. Their sequence architecture and spatial differences exert critical controls on the distribution of high-quality reservoirs. Taking the Early–Middle Ordovician platform margin belts in the Lunnan–Fuman–Gucheng area as the research object, this study systematically characterizes the sequence framework, sedimentary architecture, and segmented differential characteristics based on seismic, drilling, logging, and thin section data, using sequence stratigraphy, seismic facies analysis, and sedimentary mapping. The results show that five sequence boundaries are identified, dividing the Lower–Middle Ordovician into two second-order sequences and four third-order sequences. Seven types of mound-shoal seismic facies are developed, and three structural models are recognized from north to south: aggradation–weak retrogradation in the Lunnan section, weak aggradation–strong retrogradation in the Fuman section, and strong aggradation–weak retrogradation in the Gucheng section. It is revealed that differential subsidence caused by back-arc extension of the Altyn orogenic belt and the paleogeomorphic barrier effect of the Tadong Low Uplift collectively controlled the segmented architecture and migration evolution of the platform margin belts. The findings clarify the differential structural patterns of platform margins and provide a geological basis for hydrocarbon exploration in Ordovician platform margin reef-shoal complexes in the Tarim Basin.
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Research context
OpenAlex topics: Hydrocarbon exploration and reservoir analysis · Paleontology and Stratigraphy of Fossils · Geological and Geophysical Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
PetroChina Tarim Oilfield Company, Korla 841000, China
CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, Korla 841000, China
Xinjiang Key Laboratory of Ultra-Deep Oil and Gas, Korla 841000, China
PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China
Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China
School of Geosciences, Yangtze University, Wuhan 430100, China
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