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利用反射地震并结合部分钻井资料,通过对万安盆地大量地震资料的详细解释,对研究区内碳酸盐台地进行地震识别,进而探讨台地的沉积特征与时空分布.万安盆地碳酸盐台地最初发育于早中新世,并于中中新世时达顶盛时期,呈南北向展布,主要分布在盆地中部走滑断块构造高部位及盆地南部边缘.东西两带台地具有不同的构造沉积背景,西带为被断层复杂化的东倾斜坡,离物源较近,为碳酸盐岩与碎屑岩互层沉积;东带濒临南海海盆,离物源较远,碳酸盐岩厚度大、岩性较纯.层序地层分析表明,万安盆地碳酸盐台地主要发育于海侵体系域和高水位体系域.单个台地沉积相在平面上呈圈层结构展布,相带窄但较规则,可能包括:台内相、台缘相、前缘斜坡相(缓坡与陡坡)和盆底相,但只在台地东侧发育盆底相,这与盆地东侧靠近南海海盆的地质环境有关.
Based on the reflection seismic data and some drilling data, a detailed interpretation of a large amount of seismic data in Wan’an Basin is carried out to identify the carbonate platform in the study area, and then to discuss the sedimentary characteristics and spatial-temporal distribution of the platform. Originally developed in the Early Miocene and was distributed in the north-south direction during the mid-Miocene up to the peak of the Middle Miocene, and mainly distributed in the high positions of strike-slip fault blocks and the southern margin of the basin in the central part of the basin. The sedimentary background is constructed. The western belt is an east slope that is complicated by faults. It is close to the source and is interbedded with carbonate rocks and clastic rocks. The east belt is near the South China Sea basin and far from the source. Carbonate The sequence of the sequence stratigraphy shows that the carbonate platform in Wan’an basin mainly develops in the transgressive system tract and the highstand system tract. The sedimentary facies of a single platform distributes in a circle in the plane and the facies belt Narrow but more regular, it may include: in-phase facies, platform margin facies, leading slope facies (gentle slope and steep slope) and basin bottom facies, but the basin bottom facies is only developed on the east side of the platform, which is close to the South China Sea basin Geological environment.