The Research Of Internal Architecture Of Zhujiang Deepwater Fan System In South China Sea

More and more giant hydrocarbon in deep-water fan system have been discovered successfully around the world in the past 50 years. The great achievement attracts investment and study of many oil companies and research institutions to the deep-water fan system, and then deep-water fan system has been an active frontier of oil & gas industry and academic circle of the world. In the exploration of deep-water fan system, the internal architecture is one of the core problems on the petroleum geology of the deep-water fan system. In China, the studying on oceanic petroleum geology lag behind and the research on deep-water fan system and its internal architecture just begins. After the sufficient survey of former research achievement inland and abroad, this dissertation has firstly researched the internal architecture of Zhujiang deep-water fan system in South China Sea taking the lowstand fan of SB13.8Ma as an example in multi-scale(macroscale, mesoscale, and microscale), when applying the knowledge of Geology of Continental Margin, Ocean Geology, Ocean Sedimentation, Sequence Stratigraphy and other disciplines, and integrating the actual geological data of Baiyun Sag of Pearl River Mouth Basin in South China sea.This dissertation firstly defined and expounded the deep-water, deep-water fan system, the internal architecture of deep-water fan system. This dissertation studied the macroscale architercture of Zhujiang Deep-water Fan System in South China Sea, and proposed that it is unconfined to extensional confined with no mobile substrate deep-water fan system which developed in intra-slope basin on the Quasi-passive Continental Margin. This dissertation researched the mesoscale architecture and discovered the typical sequence stratigraphy architecture elements, such as basin-floor fan, slope fan, lowstand wedge, and incised valley in SB13.8Ma, and identified three sequence stratigraphy patterns which are type I with continental shelf break margin, type I with gentle slope, and type I with gentle slope controlled by contemporaneous fault. This dissertation estalished and practiced the methodology to research the microscale internal architecture of deep-water fan system which mainly based on 2D seismic data. This dissertation analyzed the control factors of the development and evolution to Zhujiang Deep-water Fan System in South China Sea, at the same time, the author established depositional model for Zhujiang Deep-water Fan System in South China Sea taking the SB13.8Ma as an example, and analyzed the prospect of oil & gas exploration and development with the view of Deep-water Fan System. The data of source rock, reservoir, capping, migration, trapping, preservation shows that Zhujiang Deep-water Fan System in South China Sea has a bright prospect of oil & gas exploration and development.