塔里木盆地上泥盆统-三叠系层序地层及控制因素分析

ANALYSIS ON THE UPPER DEVONIAN-TRIASSIC SEQUENCE STRATIGRAPHY IN THE TARIM BASIN AND ITS CONTROLLING FACTORS

王毅

WANG Yi

石油大学, 山东东营257062

Department of Petroleum Resource Sciences, University of Petroleum, Dongying, Shandong 257062, China

塔里木盆地泥盆统-三叠系层序地层可划分为2个巨层序、5个超层序、12个层序。晚泥盆世-三叠纪区域大地构造演化经历了“古新疆板块”的局部裂解与再拼贴的过程，塔里木盆地则经历了晚泥盆世-早二叠世弧后裂谷和晚二叠世-三叠纪前陆盆地两个阶段。巨层序Ⅰ为弧后裂谷演化阶段的产物，其中超层序ⅠA代表克拉通内坳陷盆地的沉积，超层序ⅠB代表弧后克拉通内裂谷盆地充填沉积。巨层序Ⅱ为前陆盆地演化阶段的沉积，其中超层序ⅡA代表周缘前陆盆地的充填沉积，超层序ⅡB和超层序ⅡC是内陆坳陷盆地的沉积。研究表明，构造作用在大部分Ⅲ级层序形成中起着决定性作用，只是在构造相对稳定的晚泥盆世-石炭纪的被动大陆边缘和克拉通盆地演化时期，全球海平面的升降变化才对其层序的形成起了较大的作用。

The Devonian-Triassic stratigraphic sequences in the Tarim Basin can be divided into two megasequences, five supersequences and twelve sequences. The Late Devonian-Triassic regional geotectonic evolution underwent the local splitting and rematching of "the paleo-Xinjiang plate", and the Tarim Basin involved the Late Devonian-Early Permian back-arc rift and the Late Permian-Triassic foreland basin two stages. The megasequence Ⅰ is the product of the back-arc rift evolutionary stage, in which the supersequence ⅠA represents the deposit of downwarped basins in the craton and the supersequence ⅠB represents the basin-filling deposit of rift in the bacd-arc craton. The megasequence Ⅱ is the deposit of the foreland basin evolutionary stage, in which the supersequence ⅡA represents the filled deposit of peripheral foreland basins and the supersequence ⅡB adn ⅡC are the deposit of inland downwarped basins. Research reveals that tectonic process played a decisive role in the formation of most Ⅲ-order sequences. Only in the evolutionary period of the Late Devonian-Carboniferous passive continental marginal and craton basins, during which tectonics are relatively stable, did the global eustacy act a greater part in the formation of the sequences.

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https://doi.org/10.11781/sysydz199903225