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桂中坳陷属于古生代南盘江盆地靠近江南古陆南缘的一个次级沉积坳陷,其后期构造稳定,成藏条件优越,为具有较好潜力的勘探新区。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,研究了本区层序岩相古地理特征和沉积演化史,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,期间沉积多个孤立丘台。孤立丘台发育有生物礁滩,发育时间从中泥盆世早期一直延续至中泥盆世晚期,礁滩发育具有垂向上“三种五期”叠置加积的特征。
Guizhong depression belongs to a secondary sedimentary depression in the Paleogene Nanpanjiang basin near the southern margin of the southern South China Sea. Its later tectonic stability and favorable hydrocarbon accumulation conditions make it a new exploration area with good potential. On the basis of summarizing the predecessors’ research, using the outcrop profile observation, logging and seismic facies analysis, the paper studied the palaeogeomorphology and sedimentary evolution history of the lithofacies in this area, After the eastern uplift, it evolved into a “platform-basin” facies deposition pattern during the early Hercynian uplift (DC). During this period, multiple isolated mounds were deposited. There are reef-shoal banks developed on isolated orogeny, and the developmental period extends from the early Middle Devonian to the late Middle-Devonian. The development of reef shoal has the characteristics of vertical “three kinds of five-period” superposition plus product.