塔北-塔中区域构造地质大剖面解析及古隆起成因新解

doi:10.11743/ogg20180514

摘要/Abstract

摘要： 塔北隆起和塔中低凸起是塔里木盆地十分重要的油气战略区带，研究和对比二者之间的地层系统、断裂特征和地质结构差异，对下一步的石油勘探研究具有积极意义。为了揭示两个古隆起的地质结构和成因机制，选取了一条过塔里木盆地中部的南北向区域构造地质剖面，结合最新的钻井、测井和地震资料，利用断层相关褶皱理论，对其进行了精细解析和刻画。研究结果表明：塔北隆起和塔中低凸起是受控于基底大型断层转折褶皱的古生代古隆起，由南向北的挤压应力所产生的地层位移，被塔中低凸起吸收后继续经满加尔凹陷向塔北地区传递，最终被塔北隆起吸收，加里东中晚期—海西早期是两个古隆起形成的主要时期。塔北隆起后期因南天山褶皱带的冲断作用而遭受破坏，古生界和中生界遭受大范围剥蚀，新生界自北向南加厚，断层转折褶皱前翼难以识别，塔中低凸起古生界构造运动强烈，中新生界未发生大规模断裂活动，古隆起形态稳定。

关键词: 构造地质剖面, 断裂特征, 塔北隆起, 塔中低凸起, 塔里木盆地

Abstract: The Tabei uplift and Tazhong low salient are important strategic plays for oil and gas exploration in Tarim Basin.It will be of positive value for petroleum exploration and research ahead to study and compare their stratum systems,fault characteristics and geological structural differences.In order to reveal the geological structures and origins of the two paleo-uplifts,we selected a large NS-trending regional structural cross section in central Tarim Basin for a fine interpretation and description based on fault-related fold theories,combined with the latest drilling,logging,and seismic data.The results indicate that:the Tabei uplift and Tazhong low salient are the Paleozoic paleo-uplifts controlled by the large-scale basal fault bend folds.Stratum displacement caused by compressive stress from south to north is partly absorbed by Tazhong low salient,and then continues to pass to the northern Tarim area through the Manjar Depression,with the remaining displacement absorbed by Tabei uplift at last.The period from the Middle-to-Late Caledonian to the Early Hercynian is the main formation period of the two paleo-uplifts.However,Tabei uplift suffers damage due to the thrusting of the southern Tianshan fold belt at late stage,the Paleozoic and Mesozoic sequences suffer extensive denudation,while the Cenozoic gets thickened from north to south.Thus it is difficult to recognize the front wings of the fault bend folds.Tazhong low salient experiences intensive Paleozoic tectonic movement,but doesn't experience any large-scale faulting activities during the Mesozoic and Cenozoic,so it is stable in geometry.

Key words: structural cross section, fault characteristics, Tabei uplift, Tazhong low salient, Tarim Basin

中图分类号:

TE121.2

刘长磊,张艺琼,张永,等. 塔北-塔中区域构造地质大剖面解析及古隆起成因新解[J]. 石油与天然气地质, 2018, 39(5): 1001-1010. doi: 10.11743/ogg20180514 Liu Changlei,Zhang Yiqiong,Zhang Yong,et al. Analysis of regional structural cross section of the North and Central Tarim Basin and new insights into paleo-uplift origin[J]. Oil & Gas Geology, 2018, 39(5): 1001-1010. doi: 10.11743/ogg20180514

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