南海深海平原浊流沉积及其构造意义

利用IODP349航次在南海东部次盆U1431和西南次盆U1433两个站位取得的岩心、成像测井及常规测井资料，结合区域地震剖面，研究南海深海平原浊流沉积及其构造意义。依据岩心观察，结合样品分析和测井解释，确定浊流沉积的类型、特征及成因；根据高分辨率FMS成像测井资料，结合岩心标定和常规测井约束，重建东部次盆和西南次盆深海平原浊流沉积的垂向分布序列；在合成记录井-震连接基础上，通过区域地震地层分析研究两个站位之间浊流沉积的横向分布与过渡关系；通过岩心-测井-地震综合研究，查明两个次盆浊流沉积发育的异同，探讨南海深海平原浊流沉积的发育与重大区域构造事件之间的成因联系。此项目的实施，将填补我国在现代深海平原浊流沉积研究方面的空白，对于深入理解南海深海沉积过程及未来深海资源勘探具有重要意义。

This project is aimed to investigate the abyssal plain turbidites in the South China Sea (SCS) by using the core and well-logging data of Site U1431 in the eastern SCS subbasin and Site U1433 in the southwestern SCS subbasin acquired during IODP (International Ocean Discovery Program) Leg 349, combined with regional seismic profiles. The types, sedimentary characteristics and origin of the turbidites will be obtained by core sedimentological analysis (including core observations and core sample analysis) integrated with traditional and FMS (Formation Microscanner) resistivity image logs analyses. The vertical distribution successions of turbidite layers for both sites will be reconstructed on the basis of careful interpretation of the very high-resolution (5 mm) FMS image logs calibrated by core and traditional well logging data. Lateral variations of the turbidites between the eastern sub-basin (Site U1431) and the southwest subbasin (Site U1433) will be investigated through seismic stratratigraphic interpretation constrained by core and well-logging data in order to understand the similarities and differences of turbidite development between both subbasins. Finally, genetic linkages between the tempo-spatial distribution of the abyssal plain turbidites and the regional tectonic events will be explored using the so-called ‘core-log-seismic integration’ (CLSI) method. Implementation of this project will fill the gap in the field of abyssal plain turbidites in China, and is significant for enhancing our understandings of the SCS abyssal plain sedimentation, and for future deep-sea resource exploitation.