In active rift basins, tectonism is extremely important for sequence stratigraphic patterns, affecting both the sequence architecture and internal makeup. Sequence stratigraphic framework of a Paleogene rift successio...In active rift basins, tectonism is extremely important for sequence stratigraphic patterns, affecting both the sequence architecture and internal makeup. Sequence stratigraphic framework of a Paleogene rift succession in Qiongdongnan Basin, northern South China Sea, was built using seismic profiles, complemented by well logs and cores. One first-order and three second-order sequences were identified on the basis of basin-scale unconformities, and seven third-order sequences are defined by unconformities along the basin margins and correlative conformities within the central basin. Through unconformity analysis and backstripping procedure, the Paleogene synrift tectonic evolution of deep- water area of Qiongdongnan Basin was proved to be episodic, which can be divided into rifting stage-I, rifting stage-II and rifting stage-III. Episodic rifting resulted in the formation of various types of struc- tural slope break belts, which controlled different architectures and internal makeup of sequences. This study enhances the understanding of the control of tectonic evolution on sequence stratigraphic pat- terns and establishes relevant patterns in a typical rift basin, and further proposes the favorable sand- stone reservoirs developing in different sequence stratigraphic patterns, which will be pretty helpful for subtle pool exploration in deepwater area of petroliferous basins.展开更多
Based on comprehensive analyses of seismic and tog data, this study indicates that mainty four widespread angutar to minor angutar unconformities （Tg8, Tg51, Tg5 and Tg3） were formed during the Pateozoic. Through th...Based on comprehensive analyses of seismic and tog data, this study indicates that mainty four widespread angutar to minor angutar unconformities （Tg8, Tg51, Tg5 and Tg3） were formed during the Pateozoic. Through the interpretation of structural unconformities, calcutation of eroded thickness, correction of pataeo-water depth and compaction and compiration of the Earty Paleozoic structural maps, the Earty Paleozoic stope break bert （geomorphologic unit） of the Tarim Basin is subdivided into uptift area, subaqueous uptift area, rift slope break belt, flexure stope break bert （stope bert）, depression area and deep basin area. Pataeogeomorphotogy of the Cambrian-Early Ordovician was approximately in EW trend within which three tectonic units inctuding the Tabei Pataeo-uptift, the northern Depressional Belt and the southern Pataeo-uptift developed respectivety and are grouped into two stope break systems namety as the Tabei Pataeo-uptift and the southern Pataeo-uptift. These tectonic units obviousty controt the deposition of isolated platform, open platform, restricted ptatform and deep basin. Influenced by extrusion in the Mid-Late Ordovician, the southern and northern subaqueous uptifts graduat[y etevated and then were eroded. Resuttant[y two slope break systems devetoped, namely as the northern and central Pataeo-uptifts which obviousty controtled the deposition of provenance area, isolated ptatform, mixed continental shelf, slope and basin facies. The intensive extrusion of the Mid-Late Ordovician reads to significant tectonic deformation of the Tarim Basin： large area of uplifting and erosion and development of EW trending anticline and syncline. Deposition of shore, tidal fiat, delta, shallow marine clastics and deep marine facies is obviously controlled by the Tabei, the southern and the Tadong Palaeo-uplifts. Slope break systems control development of stratigraphic unconformity and thus truncation and onlap unconformity zones become favorable areas in a palaeo-uplift and at a palaeo-slope belt f展开更多
At present the Eocene reservoir is the focus of exploration in the west sag of the beach area,Liaohe Depression,and lithologic and stratigraphic traps are the most important in the future work.The regional geological ...At present the Eocene reservoir is the focus of exploration in the west sag of the beach area,Liaohe Depression,and lithologic and stratigraphic traps are the most important in the future work.The regional geological background indicated that lithologic and stratigraphic traps might be created in the study area. Studies on creation conditions and distribution pattern of lithologic and stratigraphic traps are展开更多
基金supported by the National Science Foundation of China (NSFC) (Nos. 41272122, 41202074 and 41172123)the Major National Science and Technology Programs in the "Twelfth Five-Year" Plan of China (No. 2011ZX05009-002-02)+1 种基金the Open Research Program Foundation of Teaching Laboratory of China University of Geosciencesthe Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) of Ministry of Education (No. TPR-2013-14)
文摘In active rift basins, tectonism is extremely important for sequence stratigraphic patterns, affecting both the sequence architecture and internal makeup. Sequence stratigraphic framework of a Paleogene rift succession in Qiongdongnan Basin, northern South China Sea, was built using seismic profiles, complemented by well logs and cores. One first-order and three second-order sequences were identified on the basis of basin-scale unconformities, and seven third-order sequences are defined by unconformities along the basin margins and correlative conformities within the central basin. Through unconformity analysis and backstripping procedure, the Paleogene synrift tectonic evolution of deep- water area of Qiongdongnan Basin was proved to be episodic, which can be divided into rifting stage-I, rifting stage-II and rifting stage-III. Episodic rifting resulted in the formation of various types of struc- tural slope break belts, which controlled different architectures and internal makeup of sequences. This study enhances the understanding of the control of tectonic evolution on sequence stratigraphic pat- terns and establishes relevant patterns in a typical rift basin, and further proposes the favorable sand- stone reservoirs developing in different sequence stratigraphic patterns, which will be pretty helpful for subtle pool exploration in deepwater area of petroliferous basins.
文摘Based on comprehensive analyses of seismic and tog data, this study indicates that mainty four widespread angutar to minor angutar unconformities （Tg8, Tg51, Tg5 and Tg3） were formed during the Pateozoic. Through the interpretation of structural unconformities, calcutation of eroded thickness, correction of pataeo-water depth and compaction and compiration of the Earty Paleozoic structural maps, the Earty Paleozoic stope break bert （geomorphologic unit） of the Tarim Basin is subdivided into uptift area, subaqueous uptift area, rift slope break belt, flexure stope break bert （stope bert）, depression area and deep basin area. Pataeogeomorphotogy of the Cambrian-Early Ordovician was approximately in EW trend within which three tectonic units inctuding the Tabei Pataeo-uptift, the northern Depressional Belt and the southern Pataeo-uptift developed respectivety and are grouped into two stope break systems namety as the Tabei Pataeo-uptift and the southern Pataeo-uptift. These tectonic units obviousty controt the deposition of isolated platform, open platform, restricted ptatform and deep basin. Influenced by extrusion in the Mid-Late Ordovician, the southern and northern subaqueous uptifts graduat[y etevated and then were eroded. Resuttant[y two slope break systems devetoped, namely as the northern and central Pataeo-uptifts which obviousty controtled the deposition of provenance area, isolated ptatform, mixed continental shelf, slope and basin facies. The intensive extrusion of the Mid-Late Ordovician reads to significant tectonic deformation of the Tarim Basin： large area of uplifting and erosion and development of EW trending anticline and syncline. Deposition of shore, tidal fiat, delta, shallow marine clastics and deep marine facies is obviously controlled by the Tabei, the southern and the Tadong Palaeo-uplifts. Slope break systems control development of stratigraphic unconformity and thus truncation and onlap unconformity zones become favorable areas in a palaeo-uplift and at a palaeo-slope belt f
文摘At present the Eocene reservoir is the focus of exploration in the west sag of the beach area,Liaohe Depression,and lithologic and stratigraphic traps are the most important in the future work.The regional geological background indicated that lithologic and stratigraphic traps might be created in the study area. Studies on creation conditions and distribution pattern of lithologic and stratigraphic traps are
