被动陆缘层序地层结构的侧向变化及其启示——以珠江口盆地中中新世13.8 Ma为例

doi:10.11743/ogg20180418

石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (4): 811-822.doi: 10.11743/ogg20180418

被动陆缘层序地层结构的侧向变化及其启示——以珠江口盆地中中新世13.8 Ma为例

徐少华^1,2, 何敏³, 庞雄³, 陈维涛³, 王英民⁴, 卓海腾⁴, 秦春雨²

1. 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;
2. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249;
3. 中海石油(中国)有限公司深圳分公司, 广东广州 510240);
4. 浙江大学海洋学院, 浙江杭州 310058

收稿日期:2017-05-19 修回日期:2018-06-01 出版日期:2018-08-28 发布日期:2018-07-23
通讯作者: 陈维涛(1983-),男,高级工程师,石油地质学和沉积学。E-mail:chenwt2@cnooc.com.cn E-mail:chenwt2@cnooc.com.cn
作者简介:徐少华(1987-),男,博士、讲师,层序地层学和沉积学。E-mail:xsh_xu@163.com。
基金资助:
油气资源与探测国家重点实验室开放课题基金项目（PRP/open-1805）；重庆市教育委员会科学技术研究项目（KJ1713333）。

Lateral variation of sequence stratigraphic architecture on passive continental margin and its enlightenment: A case from the Middle Miocene in Pearl River Mouth Basin in 13.8 Ma

Xu Shaohua^1,2, He Min³, Pang Xiong³, Chen Weitao³, Wang Yingmin⁴, Zhuo Haiteng⁴, Qin Chunyu²

1. Chongqing Key Laboratory of Complicated Oil and Gas Field Exploration and Development, Chongqing University of Science and Technology, Chongqing 401331, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
3. Shenzhen Branch of COONC Ltd., Guangdong, Guangzhou 510240, China;
4. Ocean College, Zhejiang University, Hangzhou, Zhejiang 310058, China

Received:2017-05-19 Revised:2018-06-01 Online:2018-08-28 Published:2018-07-23

摘要/Abstract

摘要： 当前层序地层格架的建立依据大多源自于河口附近地层叠置规律的分析，而忽略了地层叠置关系在沉积体侧向上的变化，以至于体系域的划分标准受到沉积体范围的限制，使得层序地层划分方案不具有唯一性，难以开展凹陷内更大范围的地层对比。以珠江口盆地中中新世13.8 Ma的陆坡为例，利用井-震综合分析的方法，详细阐述层序边界（SB）特征、下降体系域（FSST）及低位体系域（LST）的地层叠置样式在侧向上的变化。认为与LST进积体系地震上可侧向追踪对比的一系列上超地层应命名为LST，而不是TST。基于区域等时对比的原则，将LST定义修订为形成于基准面上升早期，以可容空间增加速率小于沉积物供给速率为相标志，同时包含侧向上与之等时对比的一套地层；将HST定义修订为形成于基准面上升晚期，以可容空间增加速率小于沉积物供给速率为相标志，同时包含侧向上与之等时对比的一套地层；将TST定义为可容空间增加速率大于沉积物供给速率，同时排除侧向上与LST和HST等时对比的两套地层。建议被动陆缘层序地层格架的建立方法应以河口、陆架和深水作为一个有机整体，寻找各体系域的“唯一性”相标志，开展三维空间上的系统对比和检验，而非人为的对一个沉积体系分块建立层序地层格架。

关键词: 侧向变化, 体系域, 地震地层学, 层序地层学, 珠江口盆地

Abstract: Current construction of sequence stratigraphic framework is mainly based on the analysis of stratigraphic superposition patterns near the estuary,with their lateral variation in the sedimentary body neglected.So the division standards of system tracts are restricted by the range of sedimentary bodies,and the sequence stratigraphic division scheme is not unique.As a result,it's difficult to carry out stratigraphic correlation in a larger scope in a sag. The study took a case of Pearl River Mouth Basin clinoform in 13.8 Ma(belongs to the Middle Miocene),and elaborated the characteristics of sequence boundary(SB),and the lateral variations of stratigraphic superposition patterns in Falling Stage System Tract(FSST)and Low stand System Tract (LST),through combination analysis of well and seismic data.The results show that a series of onlapping strata, which can be laterally tracked and correlated with LST progradation systems on seismic sections,should be named as LST rather than TST.Based on the principle of regional isochronous correlation,the definition of LST should be revised as a set of strata that are developed in the early of base-level rising cycle,marked by accommodation increasing rate being lower than the sediment supply rate,and contain lateral equivalent beds.While the definition of HST is revised as a set of strata that are formed in the late of base-level rising cycle,marked by the accommodation increasing rate being less than the sediment supply rate,and include a set of lateral equivalent beds. Meanwhile,the TST is defined as a set of strata with facies marker of the accommodation increasing rate being greater than the sediment supply rate and the lateral equivalents of LST and HST being excluded.Thus we proposed that the reconstruction of sequence stratigraphy framework should take estuary,shelf and deep water as an integrated whole,looking for the unique facies marker of each system tract,and carrying out systematic comparison and checking in three-dimensional space,rather than factitiously splitting a sedimentary system and then establish sequence stratigraphic frameworks separately.

Key words: lateral variation, system tract, seismic stratigraphy, sequence stratigraphy, Pearl River Mouth Basin

中图分类号:

TE121.3

徐少华,何敏,庞雄,等. 被动陆缘层序地层结构的侧向变化及其启示——以珠江口盆地中中新世13.8 Ma为例[J]. 石油与天然气地质, 2018, 39(4): 811-822. doi: 10.11743/ogg20180418 Xu Shaohua,He Min,Pang Xiong,et al. Lateral variation of sequence stratigraphic architecture on passive continental margin and its enlightenment: A case from the Middle Miocene in Pearl River Mouth Basin in 13.8 Ma[J]. Oil & Gas Geology, 2018, 39(4): 811-822. doi: 10.11743/ogg20180418

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被动陆缘层序地层结构的侧向变化及其启示——以珠江口盆地中中新世13.8 Ma为例

Lateral variation of sequence stratigraphic architecture on passive continental margin and its enlightenment: A case from the Middle Miocene in Pearl River Mouth Basin in 13.8 Ma

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