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石油实验地质  2016, Vol. 38 Issue (2): 189-196    DOI: 10.11781/sysydz201602189
盆地·油藏 本期目录 | 过刊浏览 |
莺歌海盆地砂质块体搬运沉积及其天然气聚集
张迎朝, 王立锋, 李绪深, 钟泽红, 詹冶萍, 徐涛
中海石油(中国)有限公司湛江分公司, 广东湛江 524057
Sandy mass transport deposit model and its natural gas accumulation in the Yinggehai Basin
Zhang Yingzhao, Wang Lifeng, Li Xushen, Zhong Zehong, Zhan Yeping, Xu Tao
Zhanjiang Branch of CNOOC Ltd., Zhanjiang, Guangdong 524057, China
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摘要: 通过莺歌海盆地XF13区三维地震、钻井资料分析,新识别出上中新统黄流组一段砂质块体搬运沉积体系,进而研究其沉积模式及优质天然气聚集机制。钻井岩心以砂质碎屑流沉积为主,发育块状层理、平行层理、突变接触面、泥岩撕裂和变形层等重力流沉积构造;地震资料上其与围岩差异显著,呈"削截"接触关系。砂质块体搬运沉积由多期构成,每期经历"早期侵蚀-充填迁移"和"晚期废弃"2个沉积阶段,相应发育近物源砂质碎屑流、块状厚层砂岩朵叶体和远物源泥质浊流、席状砂的沉积构型。构建了外陆架、海侵-高位体系域砂质块体搬运沉积新模式。以XF13大气田为例,从砂质块体搬运沉积、构造-岩性圈闭的形成到输导体系和天然气成藏过程分析,探讨了优质天然气聚集机制,认为莺歌海盆地中深部具备形成"优质储集体、高烃类气"天然气聚集的地质条件。
关键词 沉积构型砂质块体搬运沉积沉积模式天然气聚集上中新统莺歌海盆地    
Abstract:The sandy mass transport deposit of the first member of the Huangliu Formation in the Upper Miocene was newly recognized using 3D seismic data and drilling data collected from the XF13 area of the Yinggehai Basin. The depositional model and natural gas accumulation mechanism have been investigated. Cores recorded sedimentary characteristics of sandy mass transport deposit very well, developing massive stratifications and parallel stratifications, abrupt contact surfaces, mudstone avulsions, and deformation layers. The sandy mass transport deposit had distinct seismic reflection features compared with those of surrounding rocks. They consisted of multiple periods of sedimentation, and each period experienced early erosion, filling, migration and a late abandonment stage. They developed a double-layer sedimentary architecture, which consisted of massive thick compound lobe sandbody and sheety sandbody, respectively. Each period of sandy mass transport deposit developed sandy debris flow massive thick sandstones with slide-slump movement near provenance, and muddy turbidity current deposits laterally far from the source. A new model with a transgressive-highstand systems tract and outer continent environment was proposed. A case study was made in the XF13 gas field. Through the integrated analyses of sandy mass transport deposit, structural-lithological trap formation, fault/fissure migration pathway and natural gas pooling process, natural gas accumulation mechanism were considered. The central and deep sections of the basin have favorable geologic conditions for gas enrichment and preservation.
Key wordssedimentary architecture    sandy mass transport deposit    deposit model    natural gas accumulation    Upper Miocene    Yinggehai Basin
收稿日期: 2015-04-23     
ZTFLH:  TE122.2  
基金资助:中海石油(中国)有限公司"十二五"综合科研项目"南海西部海域低孔低渗油气藏勘探开发关键技术与实践"(CNOOC-KJ125ZDXM07LTD02-ZJ)和国家"十二五"科技重大专项"南海西部海域富生烃凹陷资源潜力再评价和新区、新领域勘探方向"(2011ZX05023-001-007)资助。
作者简介: 张迎朝(1971-),男,教授级高级工程师,从事南海油气勘探、科研工作。E-mail:zhangyingzh@cnooc.com.cn。
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引用本文:

张迎朝, 王立锋, 李绪深, 钟泽红, 詹冶萍, 徐涛. 莺歌海盆地砂质块体搬运沉积及其天然气聚集[J]. 石油实验地质, 2016, 38(2): 189-196.
Zhang Yingzhao, Wang Lifeng, Li Xushen, Zhong Zehong, Zhan Yeping, Xu Tao. Sandy mass transport deposit model and its natural gas accumulation in the Yinggehai Basin. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(2): 189-196.

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http://www.sysydz.net/CN/10.11781/sysydz201602189      或      http://www.sysydz.net/CN/Y2016/V38/I2/189

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