
准噶尔盆地西部坳陷带二叠系构造-地层层序与盆地演化*
殷树铮, 郭文建, 李新宁, 周志超, 刘文辉, 焦立新, 何登发
准噶尔盆地西部坳陷带二叠系构造-地层层序与盆地演化*
Tectono-stratigraphic sequence and basin evolution in West Depression of Junggar Basin
玛湖凹陷、沙湾凹陷和盆1井西凹陷是准噶尔盆地西部三大富烃凹陷,通过对深钻井、测井和深反射地震剖面资料的分析,揭示出这三大凹陷在早二叠世隶属于同一个坳陷,据此厘定了准噶尔盆地西部坳陷带的范围。在西部坳陷带内的二叠系—上三叠统共识别出3套区域性不整合面,依据不整合面划分了3套构造层,分别是下二叠统构造层、中二叠统构造层和上二叠统—三叠系构造层。在此基础上,运用断层相关褶皱理论和平衡剖面技术进行精细构造解析和构造演化分析,并结合前人对于准噶尔盆地热史和火山岩地球化学特征的分析,重点解析西部坳陷带二叠纪—三叠纪的构造演化过程,认为二叠纪—三叠纪西部坳陷带共经历了3期构造演化,分别是早二叠世伸展裂陷阶段(早二叠世末期挤压)、中二叠世弱伸展拗陷阶段和晚二叠世—三叠纪挤压隆升阶段,且西部坳陷带的构造演化与西准噶尔和准噶尔地块的逆时针旋转在时空上相耦合。该研究成果对于揭示准噶尔盆地二叠纪盆地性质及二叠纪以来的陆内演化过程具有重要的意义。
Mahu sag,Shawan sag,and Pen-1 well west sag are the three major hydrocarbon rich sags in the west of Junggar Basin. Through the analysis of deep drilling wells,well logging,and deep reflection seismic profile data,these three sags were revealed to belong to the same depression in the early Permian,and the scope of the Western Depression of the Junggar Basin was determined accordingly. Three sets of regional unconformity surfaces were identified and three sets of structural layers were divided in the Permian to the upper Triassic within the Western Depression, i.e. ,the lower Permian structural layer,the middle Permian structural layer,and the upper Permian-Triassic structural layer. The fault related fold theory and balanced profile technique are used in the fine tectonic interpretation and tectonic evolution analysis. In combination with the previous analysis on thermal history and geochemical characteristics of volcanic rocks in the Junggar Basin,the tectonic evolution of the Western Depression in the Permian-Triassic period was mainly divided into three stages: the extensional rifting of the early Permian and the compression in the late Permian,the weak extensional depression of the Middle Permian,the compression uplift of the late Permian to Triassic period. The tectonic evolution of the western depression belt is spatiotemporally coupled with the anti-clockwise rotation of the western Junggar and Junggar Block. These results are of great significance for revealing the characteristics of the Junggar Basin during the Permian period and the evolution of intracontinental processes since the Permian period.
西部坳陷带 / 构造—地层层序 / 不整合面 / 盆地演化 / 准噶尔盆地
West Depression / tectono-stratigraphic sequence / unconformity / basin evolution / Junggar Basin
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