论文部分内容阅读
通过野外露头剖面、测井和录井、地震等资料,以层序地层学理论为指导将塔里木盆地寒武系划分为3个二级层序(SS1,SS2,SS3),14个三级层序,其中二级层序均为I型层序,主要发育海侵体系域和高位体系域。在此基础上结合其沉积相发育特征以二级层序体系域为编图单位编制了6张层序岩相古地理图。结果表明,SS1、SS2时期均表现为海侵期急速而短暂的海平面上升与高位期漫长的缓慢海平面下降,盆地中部、西部区域主要以海侵期的局限台地、开阔台地沉积转变为高位期的蒸发台地及局限台地泻湖沉积,盆地东部区域主要以陆棚、盆地沉积为主,盆地面积相对较大。SS3时期盆地中部、西部地区主要以局限台地、开阔台地沉积为主,与SS1、SS2时期不同的是SS3时期盆地沉积区域相对缩小,陆棚沉积区域扩大,在SS3高位期,盆地最东端逐渐转变为碳酸盐台地沉积。
Based on the sequence stratigraphy theory, the Cambrian of Tarim Basin is divided into three second-order sequences (SS1, SS2, SS3), 14 third-level strata Sequence, of which the second-order sequence are type I sequence, the main development of transgressive system tract and high-level system tract. Based on this, combined with the characteristics of sedimentary facies development, six sequence lithofacies paleogeographic maps were compiled based on the second-order sequence system tract. The results show that both SS1 and SS2 are characterized by rapid and transient sea-level rise during the transgression and long-term slow sea-level declines over the high water level. The central and western regions of the basin are dominated by transgressive terraces and open platform sediments, Period of evaporative platform and confined platform lagoon deposition, the eastern basin mainly in the continental shelf, basin-based deposition, the basin area is relatively large. In the SS3 epoch, the central and western parts of the basin are mainly dominated by confined mesa and open platform. Unlike the SS1 and SS2 epochs, the sedimentary basin in the basin was relatively narrowed and the continental shelf was expanded in the SS3 epoch, Converted to carbonate platform deposition.