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首页> 外文期刊>Journal of Palaeogeography >Characteristics of the Paleozoic slope break system and its control on stratigraphic-lithologic traps: An example from the Tarim Basin, western China
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Characteristics of the Paleozoic slope break system and its control on stratigraphic-lithologic traps: An example from the Tarim Basin, western China

机译：古生代斜坡折断系统的特征及其对地层-岩性圈闭的控制-以中国塔里木盆地为例

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Abstract Based on comprehensive analyses of seismic and log data, this study indicates that mainly four widespread angular to minor angular unconformities (Tg8, Tg51, Tg5 and Tg3) were formed during the Paleozoic. Through the interpretation of structural unconformities, calculation of eroded thickness, correction of palaeo-water depth and compaction and compilation of the Early Paleozoic structural maps, the Early Paleozoic slope break belt (geomorphologic unit) of the Tarim Basin is subdivided into uplift area, subaqueous uplift area, rift slope break belt, flexure slope break belt (slope belt), depression area and deep basin area. Palaeogeomorphology of the Cambrian-Early Ordovician was approximately in {EW} trend within which three tectonic units including the Tabei Palaeo-uplift, the northern Depressional Belt and the southern Palaeo-uplift developed respectively and are grouped into two slope break systems namely as the Tabei Palaeo-uplift and the southern Palaeo-uplift. These tectonic units obviously control the deposition of isolated platform, open platform, restricted platform and deep basin. Influenced by extrusion in the Mid-Late Ordovician, the southern and northern subaqueous uplifts gradually elevated and then were eroded. Resultantly two slope break systems developed, namely as the northern and central Palaeo-uplifts which obviously controlled the deposition of provenance area, isolated platform, mixed continental shelf, slope and basin facies. The intensive extrusion of the Mid-Late Ordovician leads 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 flat, 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.
机译：摘要在对地震和测井资料进行综合分析的基础上，该研究表明，在古生代期间，主要形成了四个广泛的成角度到次要角度不整合面（Tg8，Tg51，Tg5和Tg3）。通过对构造不整合面的解释，侵蚀厚度的计算，古水深的校正和压实以及早期古生代构造图的编制，将塔里木盆地的早期古生代坡折带（地貌单元）细分为隆起区，亚水相隆起区，裂谷坡折带，挠曲坡折带（斜坡带），depression陷区和深盆区。寒武纪-早奥陶纪的古地貌呈{EW}趋势，其中塔贝北古隆起，北部De陷带和南部古隆起三个构造单元分别发育，并分为两个坡折系统古隆起和南部古隆起。这些构造单元显然控制着孤立台地，开放台地，受限台地和深盆的沉积。受奥陶纪中晚期挤压作用的影响，南部和北部水下凸起逐渐升高，然后被侵蚀。结果，形成了两个斜坡折断系统，即北部和中部的古隆起，明显地控制了物源区，孤立平台，混合大陆架，斜坡和盆地相的沉积。中晚奥陶纪的强烈挤压导致塔里木盆地发生明显的构造变形：大面积隆升和侵蚀以及{EW}趋势背斜和向斜的发育。塔贝，南部和塔东古隆起明显控制了海岸，潮滩，三角洲，浅海碎屑和深海相的沉积。斜坡折断系统控制着地层不整合面的发展，因此，在古隆起和古斜坡带上，截断和上覆不整合面成为有利的区域，形成了重要的不整合圈闭。而沿古隆起边缘的斜坡（斜坡折断带）是一个地貌学单元，高能沉积相广泛发育，例如礁石，卵质碎屑碎屑或生物碎屑灰岩滩涂相，因此，岩石构造通常在以下时间形成复合油气藏：构造条件适宜。此外，大型古隆起是油气成藏最有利的地区。

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