论文部分内容阅读
通过巴楚—麦盖提地区(巴麦地区)钻井和地震资料的详细分析,结合前寒武纪区域构造、沉积演化,将前寒武系顶面不整合划分为角度不整合、非整合、超覆不整合和平行不整合,这4类不整合分别揭示了裂谷、基底隆起、隆起斜坡和沉积坳陷等。进一步分析了不整合在平面上的分布特征,表明具有从非整合、超覆不整合向整合逐级过渡的分布规律。认为基底古隆起北缘以吐木休克断裂一带为界,南缘可能以铁克里克地区为界,其中基底古隆起的主体位于麦盖提地区和巴楚地区南缘,基底隆起的构造斜坡位于现今塔里木西南坳陷区、巴楚地区北部。基底古隆起演化上可分为前寒武纪平缓古陆阶段、前寒武纪末隆升加强阶段和早—中寒武世沉降埋藏阶段。总体上古隆起在前寒武纪具有南缓北陡特征,早—中寒武世具有南陡北缓特征,分别控制了南华纪—震旦纪和早—中寒武世地层发育和分布。
Based on the detailed analysis of drilling and seismic data in the Bachu-Mai Giti region (the Baimai region) and the pre-Cambrian regional tectonics and sedimentary evolution, the unconformities in the Precambrian top unconformity are divided into three types: angle unconformity, Overlapping unconformity and parallel unconformity, these four types of unconformities reveal rift, basement uplift, uplift slope and sedimentary depression respectively. Further analysis of the distribution characteristics of unconformity in the plane shows that there is a gradual transition from non-integration, over-integration to integration. It is considered that the northern margin of the Paleoproterozoic is bounded by the Tumian-Shock fracture zone, and the southern margin may be bounded by the Axelike region, in which the main paleo-uplift of the basement is located in the southern margin of the Maigaiti region and Bachu region. Located in the present southwestern Tarim Basin, northern Bachu region. The paleo-uplift of the basement can be divided into the gentle Precambrian stage of Precambrian, the uplift of the Precambrian uplift and the subsidence of the Early-Middle Cambrian. In general, the paleo-uplift had the characteristics of south-easterly and north-steep in the Precambrian. The early-middle Cambrian had the characteristics of south-steep north-easterly and controlled the development and distribution of the Nanhua-Sinian and Early-Middle Cambrian strata, respectively.