万安盆地西部南昆嵩地区渐新世以来构造事件的沉积响应  

Sedimentary responses to tectonic events since the Oligocene in the South Kunsong area of the western Wan’an Basin

作　　者：贺华瑞 栾锡武 魏新元 闫恒 He Huarui;Luan Xiwu;Wei Xinyuan;Yan Heng(Shandong University of Science and Technology,Qingdao,Shandong 266590;College of Marine Geosciences,Ocean University of China,Qingdao,Shandong 266100;School of Geosciences,China University of Petroleum,Qingdao,Shandong 266000)

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590 [2]中国海洋大学地球科学学院,山东青岛266100 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266000

出　　处：《地质科学》2022年第3期653-670,共18页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:92055211);中国—东盟海洋地震数据平台与研究中心建设项目(编号:12120100500017001)资助。

摘　　要：南昆嵩地区位于万安盆地西部,晚中新世其北部断陷逐渐被沉积充填,南昆嵩地区成为万安盆地重要的物源输入通道,独特的构造位置使其成为研究万安盆地西部沉积充填演化与万安断裂走滑活动的窗口。对研究区开展地震资料的解释工作,综合运用沉积盆地分析和层序地层学等方法,通过对地震相的精细刻画,结合研究区几次重要构造事件之间的联系,分析南昆嵩地区构造事件的沉积响应。研究结果表明:南昆嵩地区区域地质构造具有明显南北分区的特征,北部为箕状断陷湖盆,南部为向西北方向倾斜的缓坡;南昆嵩地区渐新世以来主要发育断陷湖、下切河谷、扇三角洲、辫状河三角洲、陆架三角洲等类型的沉积相;现今南海扩张的背景下产生的一系列构造运动以及万安断裂多期左旋—右旋走滑运动对南昆嵩地区沉积充填演化具有控制作用。The South Kunsong area is located in the western part of the Wan ’ an Basin, and its northern fault depression was gradually filled by sediments in the Late Miocene. The South Kunsong area has become an important provenance input channel of the Wan ’an Basin. The window of sedimentary filling evolution and strike-slip activity of Wan ’ an fault. Conduct seismic data interpretation work in the study area, comprehensively use sedimentary basin analysis and sequence stratigraphy and other methods, through fine characterization of seismic facies, combined with the connection between several important tectonic events in the study area, analyze the structure of the South Kunsong area deposition response to events. The research results show that the regional geological structure of the South Kunsong area has the characteristics of obvious north-south division, the northern part is a rifted lake basin, and the southern part is a gentle slope inclined to the northwest. Since then, it has mainly developed sedimentary facies of rifted lakes, incised valleys, fan deltas, braided river deltas, shelf deltas and other types of sedimentary facies. A series of tectonic movements under the background of the current South China Sea expansion and multi-stage left-lateral strike-slip of Wan ’an fault movement controls the evolution of sedimentary filling in the South Kunsong area.

关 键 词：万安盆地 南昆嵩地区 沉积相 构造事件 

分 类 号：P736.2[天文地球—海洋地质]