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乌石凹陷流沙港组烃源岩地球化学特征
李福来1,2,吕琳3,马文宽1,2,刁浩1,2,徐志尧4,白云明5,杨建磊6,刘红艳7
(1.中国石油大学(华东)深层油气重点实验室,山东青岛 266580;2.中国石油大学(华东)地球科学与技术学院,山东青岛 266580;3.中国石油大港油田勘探开发研究院,天津 300280;4.苏州冠德能源科技有限公司,江苏苏州 215000;5.中国石油大港油田公司第三采油厂,河北沧州 061023;6.中国石油大学胜利学院油气工程学院,山东东营 257000;7.中国石油大庆油田勘探开发研究院,黑龙江大庆 163002)
摘要:
应用岩石热解实验、显微组成分析、元素分析、镜质体反射率和生物标志化合物等分析方法,研究有机质丰度、类型、成熟度及母质沉积环境,对乌石凹陷流沙港组不同层段烃源岩的地球化学特征进行综合评价和对比。结果表明:流二段下部油页岩有机碳含量最高,类型为Ⅰ—Ⅱ1型,且普遍达到成熟水平,是研究区最有利的烃源岩层段,流二段上部油页岩次之,流三段烃源岩是好的烃源岩,而流一段烃源岩为中等烃源岩;流沙港组以弱还原—还原环境为主,除流一段以高等植物输入为主外,该组烃源岩既有丰富的水生生物输入,又有一定数量的陆生生物来源,尤其是流二段下部油页岩有机母源中藻类输入较多。
关键词:  乌石凹陷  烃源岩  生物标志化合物  地球化学特征
DOI:10.3969/j.issn.1673-5005.2021.01.004
分类号::P 618.13
文献标识码:A
基金项目:
Geochemical characteristics of source rocks in Liushagang Formation of Wushi Sag
LI Fulai1,2, LÜ Lin3, MA Wenkuan1,2, DIAO Hao1,2, XU Zhiyao4, BAI Yunming5, YANG Jianlei6, LIU Hongyan7
(1.Key Laboratory of Deep Oil and Gas in China University of Petroleum (East China), Qingdao 266580, China;2.School of Geosciences in China University of Petroleum (East China), Qingdao 266580, China;3.Research Institute of Exploration & Development, Dagang Oilfield Company, PetroChina, Tianjin 300280, China;4.Suzhou Grand Energy Technology Limited, Suzhou 215000, China;5.The Third Oil Production Plant of Dagang Oilfield, PetroChina, Cangzhou 061023, China;6.Department of Oil & Gas Engineering in Shengli College, China University of Petroleum, Dongying 257000, China;7.Research Institute of Exploration & Development, Daqing Oilfield Company, PetroChina, Daqing 163002, China)
Abstract:
The thermal decomposition experiment, microscopic composition analysis, element analysis, vitrinite reflectance and biomarkers were utilized to comparatively analyze and contrast the organic geochemical characters of source rocks of Liushagang Formation, Wushi Sag based on its abundance, types, maturity and sedimentary environment. The results show that the oil shale in bottom of L2 has the highest organic content, which belongs to type Ⅰ-Ⅱ1 kerogen. The organic matter are in the mature stage, which is the most favorable source rocks of the study area, followed by oil shale on top of L2, normal source rocks of L2 and L3 are evaluated as good source rocks, the L1 source rock are evaluated as medium source rocks. It is also found that Liushagang Formation belongs to weak reduction-reduction environment. Apart that the organic source material of L1 is mainly higher plant, the organic source material is lower aquatic plants mixed with some higher plants, and especially the bottom of L2 has more algae input.
Key words:  Wushi Sag  source rock  biomarker  geochemical characteristic
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