CAJ | 학술논문

深水陆坡沉积是近年来我国海域油气勘探关注的重点。利用二维多道地震剖面及周边钻井资料，以外部形态和内部结构相结合的方式对南海北部双峰南陆坡区早—中中新世地层进行地震相分析，识别出斜交型前积、丘状前积、席状杂乱、席状平行4种地震相类型。结合研究区古地理及其邻区同时期的构造—沉积演化分析，认为其主要发育了陆架边缘三角洲、斜坡扇及滑塌体3种典型的沉积体，它们的发育与演化是构造运动、相对海平面变化及物源三方因素相互作用的结果。以华南及古珠江供源的三角洲体系是影响陆坡区沉积体系发育的最重要因素，是沉积体系发育的物质基础，构造运动和相对海平面变化为陆坡区沉积体系的发育提供了可容纳空间。
심수륙파침적시근년래아국해역유기감탐관주적중점。이용이유다도지진부면급주변찬정자료，이외부형태화내부결구상결합적방식대남해북부쌍봉남륙파구조—중중신세지층진행지진상분석，식별출사교형전적、구상전적、석상잡란、석상평행4충지진상류형。결합연구구고지리급기린구동시기적구조—침적연화분석，인위기주요발육료륙가변연삼각주、사파선급활탑체3충전형적침적체，타문적발육여연화시구조운동、상대해평면변화급물원삼방인소상호작용적결과。이화남급고주강공원적삼각주체계시영향륙파구침적체계발육적최중요인소，시침적체계발육적물질기출，구조운동화상대해평면변화위륙파구침적체계적발육제공료가용납공간。
Deep?water deposition on the slope has become one of the major issues in China’ s offshore oil and gas exploration in recent years.We studied the seismic facies of the Shuangfengnan Slope in the northern South China Sea during the Early?Middle Miocene by combining external form and inner structure based on 2D multi?channel seismic and drilling data.Four typical seismic facies were recognized, including “S” type progradational seismic facies, mound type progradational seismic facies, parallel chaotic seismic facies, and parallel seismic facies. The paleogeographic evolution of the study area and the tectonic?sedimentary evolution of its adjacent area during the same period showed that three typical sedimentary systems ( shelf?margin delta, slope fans, and slump deposits) were developed under the control of relative sea level change, provenance and the tectonic movement. The delta system with sources from South China and the Pearl River is the most important factor affecting the development of slope depositional system, and is the material basis of the depositional system. Tectonic movement and relative sea level change provided accommodation for the slope sedimentary system development.