摘要
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 for forming important unconformity traps; Whereas slope （slope break） belt along a palaeo-uplift margin is a geomorphologic unit where high-energy sedimentary facies widely develops, such as reef, oolitic sandy clastics or bioclastic limestone beach bar facies, thus litho-structural composite hydrocarbon accumulations usually develop when tectonic condition is suitable. In addition, large-scale palaeo-uplifts are the most favourable areas for hydrocarbon accumulation development.
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 for forming important unconformity traps; Whereas slope （slope break） belt along a palaeo-uplift margin is a geomorphologic unit where high-energy sedimentary facies widely develops, such as reef, oolitic sandy clastics or bioclastic limestone beach bar facies, thus litho-structural composite hydrocarbon accumulations usually develop when tectonic condition is suitable. In addition, large-scale palaeo-uplifts are the most favourable areas for hydrocarbon accumulation development.
