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[1]潘文静 杜晓峰 田德瑞 郭龙龙 汤国民.渤海莱州湾凹陷烃源岩特征及形成机理分析[J].中国海上油气,2019,31(06):60-68.[doi:10.11935/j.issn.1673-1506.2019.06.007]
 PAN Wenjing DU Xiaofeng TIAN Derui GUO Longlong TANG Guomin.Characteristics and formation mechanism of source rocks in the Laizhou Bay sag of the Bohai sea[J].China Offshore Oil and Gas,2019,31(06):60-68.[doi:10.11935/j.issn.1673-1506.2019.06.007]
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渤海莱州湾凹陷烃源岩特征及形成机理分析()

《中国海上油气》[ISSN:1673-1506/CN:11-5339/TE]

卷:
第31卷
期数:
2019年06期
页码:
60-68
栏目:
渤海海域油气勘探开发成果专辑
出版日期:
2019-11-21

文章信息/Info

Title:
Characteristics and formation mechanism of source rocks in the Laizhou Bay sag of the Bohai sea
文章编号:
1673-1506(2019)06-0060-09
作者:
潘文静 杜晓峰 田德瑞 郭龙龙 汤国民
(中海石油(中国)有限公司天津分公司 天津 300459)
Author(s):
PAN Wenjing DU Xiaofeng TIAN Derui GUO Longlong TANG Guomin
(CNOOC China Limited, Tianjin Branch, Tianjin 300459, China)
关键词:
渤海 莱州湾凹陷 沙三段 沙四段 烃源岩特征 形成机理
Keywords:
Bohai sea Laizhou Bay sag Es3 Es4 source rock characteristics formation mechanism
分类号:
TE122.2
DOI:
10.11935/j.issn.1673-1506.2019.06.007
文献标志码:
A
摘要:
渤海莱州湾凹陷油气资源潜力大,但是各层系烃源岩特征及形成机制不明。为了明确优质烃源岩分布规律,对莱州湾凹陷主力生烃层系烃源岩特征及形成机理进行了分析。通过系统的有机地球化学、古生物学、岩石学研究,证实沙三段、沙四段是莱州湾凹陷最主要的生烃层系,并且均为好—优质烃源岩层系,但是各次洼不同层系烃源岩差异明显。沙四段沉积时期,南洼水体规模小,受干旱气候影响更强烈,形成盐湖环境,为有机质提供了较好的保存条件,同时细粒无机矿物选择性保存的特点使得南洼有机质成分构成水源无定形-孢质组合; 而北洼为莱州湾凹陷沉积中心,处于稳定湖相沉积环境,形成陆源无定形的孢粉相组合。沙三段沉积时期,各次洼受构造活动影响强烈,沉积环境分异明显,古地貌和区域地质事件是引起烃源岩平面差异的重要原因。本文研究成果对莱州湾凹陷优质烃源岩的精细研究及预测具有重要意义。
Abstract:
The potential of oil and gas resources in the Laizhou Bay sag of the Bohai sea is huge, but the characteristics and formation mechanism of source rocks in different strata are still unknown. In order to clarify the distribution law of high-quality source rocks, the characteristics and formation mechanism of the source rocks of main hydrocarbon-generating strata in the Laizhou Bay sag have been analyzed. Through the systematic organic geochemistry, paleontology and petrology researches, it is confirmed that the Es3 and Es4 are the most important hydrocarbon-generating strata in the Laizhou Bay sag, and they are all good-high quality source rocks strata; whereas, the source rocks of different strata in each sub-sag are significantly different. During the sedimentary period of the Es4, the water body size of the south sub-sag was small, and it was more strongly affected by the arid climate. It developed the salt lake environment and provided better preservation conditions for organic matters. At the same time, the selective preservation of fine-grained inorganic minerals enabled the organic matters of south sub-sag form the aquatic amorphous-spore assemblage, and the north sub-sag is the sedimentary center of Laizhou Bay sag,which is in a stable lake sedimentary enviroment, forming the terrestrial amorphous sporopollen. During the sedimentary period of the Es3, each sub-sag was strongly influenced by the tectonic activities, the sedimentary environments were distinctive, and the paleo-geomorphology and regional geological events were the important causes of the regional differences of source rocks. The research results of this paper are of great significance for the fine research and prediction of high quality source rocks in the Laizhou Bay sag.

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备注/Memo

备注/Memo:
*“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究(编号:2016ZX05024-003)”部分研究成果。 第一作者简介: 潘文静,女,工程师,2013年毕业于中国地质大学(武汉),获硕士学位,主要从事油气勘探工作。地址:天津市滨海新区海川路2121号渤海石油管理局(邮编:300459)。E-mail:panwj@cnooc.com.cn。
更新日期/Last Update: 1900-01-01