珠江口盆地白云凹陷13.8 Ma前后深水扇差异沉积过程及主控因素

doi:10.11743/ogg20180416

石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (4): 791-800.doi: 10.11743/ogg20180416

珠江口盆地白云凹陷13.8 Ma前后深水扇差异沉积过程及主控因素

杨璐^1,2, 王英民¹, 何敏³, 陈维涛³, 徐少华⁴, 卓海腾¹, 王星星¹, 李文静¹

1. 浙江大学海洋学院, 浙江舟山 316021;
2. 中国石化石油物探技术研究院, 江苏南京 211103;
3. 中海石油(中国) 有限公司深圳分公司, 广东深圳 518000;
4. 重庆科技学院复杂油气田勘探开发重庆市重点实验室, 重庆 401331

收稿日期:2017-10-19 修回日期:2018-05-10 出版日期:2018-08-28 发布日期:2018-07-23
通讯作者: 王英民(1954-),男,教授,沉积地层学和海洋地质学。E-mail:wym3939@vip.sina.com E-mail:wym3939@vip.sina.com
第一作者简介:杨璐(1994-),女,硕士,地震资料解释和海洋地质学。E-mail:zju_yanglu@163.com。
基金项目:
国家自然科学基金项目（41372115；41706050）。

Differential deposition and controlling factors of deep-water fan around 13.8 Ma in the Baiyun Sag,Pearl River Mouth Basin

Yang Lu^1,2, Wang Yingmin¹, He Min³, Chen Weitao³, Xu Shaohua⁴, Zhuo Haiteng¹, Wang Xingxing¹, Li Wenjing¹

1. Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China;
2. SINOPEC Geophysical Research Institute, Nanjing, Jiangsu 211103, China;
3. Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong 518000, China;
4. Chongqing Key Laboratory of Complicated Oil and Gas Field Exploration and Development, Chongqing University of Science and Technology, Chongqing 401331, China

Received:2017-10-19 Revised:2018-05-10 Online:2018-08-28 Published:2018-07-23

摘要/Abstract

摘要： 珠江口盆地白云深水区是南海北部油气勘探重要的前景地区，但是目前对白云深水扇的体系域构成及沉积演化过程的理解仍有待加强。基于三维地震剖面、钻测井数据和平面属性综合分析，探讨了珠江口盆地白云凹陷13.8 Ma前后FSST和LST的划分识别依据，描述并对比了两体系域内深水扇的沉积展布特征和时空演化过程。分析后认为FSST为垂向上砂质单点源供给的小型舌状扇体，而LST扇体脱离三角洲主物源，为砂泥混合、多线源供给的大型不规则多期叠合扇体。多因素耦合条件下前者可向后者逐渐转化，推测陆架坡折处充足的沉积物供给和相对海平面变化等综合因素提供了背景基础，同时，强烈的自西南向东北的沿岸流是转化的有利因素。

关键词: 深水扇, 浊流沉积, 体系域, 层序地层, 白云凹陷, 珠江口盆地

Abstract: The deep-water zone in the Baiyun Sag,Pearl River Mouth Basin,is an important prospect area for oil and gas exploration in the northern South China Sea,but the understanding of the system tracts' composition and the depositional evolution process of the deep-water fans is still to be strengthened. Based on the comprehensive analysis of 3-D seismic profile,well logging and drilling data and plane properties,we discussed the evidences to identify FSST and LST,described and compared the sedimentary facies distribution characteristics and spatio-temporal evolution processes of the deep-water fans in the two system tracts. The result suggests that the fan in FSST is a small tongue-shaped fan,supplied by single sandy source vertically,whereas the fan in LST is a large irregular superposed fan with multi-line sources of mixed sand and mud,getting rid of major provenance supply from the delta. During the transformation from the former to the latter with multi-factors coupling,we speculate that such synthetic factors as sufficient sediment supply at the continental shelf break and relative sea level changes,function to provide a fundamental background;simultaneously,the strong coastal currents from southwest to northeast can be a favorable factor for the transformation.

Key words: deep-water fan, turbidity sediment, system tract, sequence stratigraphy, Baiyun Sag, Pearl River Mouth Basin

中图分类号:

TE121.3

杨璐,王英民,何敏,等. 珠江口盆地白云凹陷13.8 Ma前后深水扇差异沉积过程及主控因素[J]. 石油与天然气地质, 2018, 39(4): 791-800. doi: 10.11743/ogg20180416 Yang Lu,Wang Yingmin,He Min,et al. Differential deposition and controlling factors of deep-water fan around 13.8 Ma in the Baiyun Sag,Pearl River Mouth Basin[J]. Oil & Gas Geology, 2018, 39(4): 791-800. doi: 10.11743/ogg20180416

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珠江口盆地白云凹陷13.8 Ma前后深水扇差异沉积过程及主控因素

Differential deposition and controlling factors of deep-water fan around 13.8 Ma in the Baiyun Sag,Pearl River Mouth Basin

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