收稿日期: 2013-01-28
修回日期: 2013-05-30
网络出版日期: 2013-10-10
基金资助
国家重点基础研究发展规划(973)项目(编号:2009CB219407);国家自然科学基金项目(编号:41372115)联合资助.
Evolution and Main Controlling Factors of Reefin the Southern Deepwater of Qiongdongnan Basin
Received date: 2013-01-28
Revised date: 2013-05-30
Online published: 2013-10-10
为了指导琼东南盆地南部深水区的油气勘探,利用高精度三维地震资料对该区中新世地层开展生物礁识别、演化和主控因素研究,结果表明:生物礁在地震上呈丘状,顶底均为强振幅反射,内部杂乱,局部呈对称状,上覆地层可见上超反射,与LH11-1油田生物礁的地震反射特征极为相似;同时,在平面上研究区生物礁集中于东北部碳酸盐岩台地边缘及台地内部的构造高部位上;垂向上生物礁发育经历了多期的暴露—生长—淹没过程。相对海平面变化控制了生物礁的发育,其中相对海平面下降导致生物礁向海迁移并使早期生物礁遭受淋滤作用;而相对海平面上升引起生物礁向构造高部位迁移。除此之外,构造作用、陆源碎屑供给、古地理及古气候等因素也对生物礁的发育产生影响。
唐武,王英民,杨彩虹,张 雷,仲米虹,朱国隆,李 冬 . 琼东南盆地南部深水区生物礁演化规律及主控因素[J]. 天然气地球科学, 2013 , 24(5) : 965 -974 . DOI: 10.11764/j.issn.1672-1926.2013.05.965
In order to direct the petroleum exploration in the southern deepwater area of Qiongdongnan Basin,based on high resolution 3D seismic data,the identification,evolution and main controlling factors of reef in the southern deepwater area of Qiongdongnan Basin were studied.The results show that the seismic features of the reef in this area are mounded reflections,with high amplitude reflections in the bottom and top,but chaotic internal reflections.In local area,it shows symmetrical reflections or onlap reflections on the overlying strata.The seismic reflection characteristics are similar to the reef seismic reflection of LH11-1 Oilfield.Simultaneously,the reef mainly distributes in the margin or the inner high parts of northeastern carbonate platform.Vertically,the reef has experienced the process of exposing-growing-drowning several times,which is determined by the relative sea level changes.The dropping of the relative sea level causes the accretion of reef towards the sea and the leaching of the earlier reef.While,the rise of the relative sea level leads to the reef migrate toward the structure highs.Additionally,tectonic movement,terrestrial material supply,paleogeography and paleoclimate also influence the development of reef.
Key words: Reef; Evolution; Main controlling factors; Qiongdongnan Basin
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