论苏北后生—同生断陷盆地性质  

Study on characteristics of hysterogenic reconstructive and syngenetic rift basins in Subei Basin

作　　者：刘玉瑞[1] 

机构地区：[1]中国石化江苏油田分公司科技处,江苏扬州225009

出　　处：《复杂油气藏》2017年第1期1-8,共8页Complex Hydrocarbon Reservoirs

基　　金：中国石油化工股份有限公司科技项目"苏北盆地构造体系特征;演化与成藏研究"(P15077)

摘　　要：苏北盆地发育颜色、岩性、岩相迥异,沉积范围不同的3套构造层。中部戴南组—三垛组箕状断陷、上部盐城组—东台组萎缩拗陷建造,大家有共识。下部泰州组—阜宁组以满盆广布的暗色细岩性为主,边缘相几乎剥蚀殆尽,残留地层和现今构造呈"箕状外形"格局,由此形成了断陷、拗陷等多种不同性质盆地观;成盆分歧导致控砂预测出现偏差,甚至误导。在分析前人的盆地观、论据问题,明确同生、后生盆地概念后,根据地震层序结构边界样式,沉积体系特征,主干断裂控制作用,层序地层型式,地层剥蚀残留等特征,来识别断陷湖盆、拗陷湖盆,多种证据链互证,得出泰州组—阜宁组是原型拗陷盆地建造产物,结论具有唯一性,后被强烈改造成为"箕状形态"的后生断陷盆地;叠合了戴南组—三垛组同生断陷,以及晚期的盐城组—东台组萎缩拗陷,形成了现今的后生—同生断陷盆地。There are three sets of sructural layers with different color,lithology,lithoface and distribution developed in Subei Basin. Dainan and Sanduo Formation which lie in the middle have the characteristics of half graben and Yancheng Formation which lies on the top has atrophic depression character,as researchers have reached a consensus. Taizhou and Funing Formation lying at the bottom have widely distributed dark fine lithology whose marginal sedimentary facies belts are almost completely eroded and whose shape likes a dustpan today. So there are different points of view of basin＇s character during the period of Taizhou and Funing Formation depositing,such as rift basin,depression basin,etc. Prediction of sand control mechanism usually appears deviation from different basin view and even may result in misleading. Based on analysis of previous basin view and argument problems,the concepts of hysterogenetic reconstructive basin and syngenetic rift basin are identified. According to the chain of evidence to identifying rift and depression basin including boundary pattern of seismic sequence structure,depositional system characteristics,control effect of main faults,sequence stratigraphic pattern,residual characteristics of formation erosion,etc.,it is put forward that Subei Basin is a depression basin in the period of Taizhou and Funing Formation depositing and later is strongly deformed to a dustpan shape of hysterogenetic reconstructive,which the conclusion is unique. Above all,Subei Basin today is a hysterogenetic reconstructive-syngenetic rift basin which suffers later syngenetic rift basin during the deposition period of Dainan and Sanduo Formation and at last experiences atrophic depression during deposition of Yancheng-Dongtai Formation.

关 键 词：盆地分析 下构造层 原型拗陷 后生断陷 同生断陷 苏北盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]