桂中地区泥盆纪碳酸盐岩沉积特征与孤立台地礁滩演化

发布时间：2018-08-24 16:59

【摘要】：桂中坳陷是在加里东运动基础上形成的晚古生代海相大型沉积坳陷,其后期构造稳定,为具有较好潜力的勘探新区。其中,该区泥盆系地层深埋地腹,为主要勘探目的层系和近期研究的热点。在总结前人研究的基础上,运用野外露头剖面观测、测录井、地震相分析等技术手段,建立了本区泥盆系层序地层格架,由下而上划分为3个三级层序:SS1、SS2、SS3,完成了桂中地区泥盆系地层与地震层序格架的统一。研究了本区泥盆纪沉积特征和沉积演化史,分析认为桂中坳陷经历加里东期隆升后,在海西早期(D-C)的拉张背景下,演变为"台-盆"相间的沉积格局,期间沉积多个孤立台地。孤立台地边缘发育有生物礁滩,发育时间从中泥盆世早期一直延续至中泥盆世晚期,首次提出该地区孤立台地礁滩发育具有垂向上"三种五期"叠置加积的特征。其中,层序SS1沉积期(早泥盆世晚期-中泥盆早期)为孤立台地礁滩发育的奠基-发展期。层序SS2沉积期(中泥盆世中期-中泥盆世晚期)为孤立台地礁滩发育的繁盛期。层序SS3沉积期(晚泥盆世)为孤立台地礁滩发育的消亡期。
[Abstract]:Guizhong depression is a large marine sedimentary depression of late Paleozoic formed on the basis of Caledonian movement. Its late structure is stable and it is a new exploration area with good potential. Devonian strata buried deep in the hinterland of the depression are the main exploration target strata and the research hotspot in the near future. By means of observation, logging and seismic facies analysis, the sequence stratigraphic framework of the Devonian system in this area is established, which can be divided into three third-order sequences from bottom to top: SS1, SS2 and SS3. The unification of the Devonian strata and seismic sequence framework in central Guangxi is completed. After the eastern uplift, in the early Hercynian (D-C) stretching background, it evolved into a "platform-basin" interfacial sedimentary pattern, during which several isolated platforms were deposited. Sequence SS1 sedimentary period (late Early Devonian-early Middle Devonian) is the foundation-development period of isolated platform REEF-BEACH development. Sequence SS2 sedimentary period (middle Middle Devonian-late Middle Devonian) is the flourishing period of isolated platform REEF-BEACH development. Sequence SS3 sedimentary period (late Devonian) is the flourishing period of isolated platform REEF-BEACH development. The death period.
【作者单位】：中国石化勘探分公司;
【基金】：国家科技重大专项(2017ZX05005003)资助
【分类号】：P534.44;P618.13

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