鄂尔多斯盆地南缘铜川地区三叠系延长组长9段浊积岩特征及对有机质富集的影响
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摘要
通过岩芯观察、岩石薄片粒度分析,在鄂尔多斯盆地南缘铜川地区三叠系延长组9段识别出了浊积岩,并揭示了其垂向上典型鲍马序列组合及沉积特征。同时,对鄂尔多斯盆地延长组长9段的油页岩、富有机质泥岩等样本进行TOC、热解测试,分析了该段浊积岩特征及对有机质富集的特征及影响。结果表明:半深湖--深湖区油页岩、泥岩干酪根类型以Ⅱ1型为主,浊积岩上下层位的泥岩、泥页岩、粉砂质泥岩等干酪根类型主要为Ⅲ型和Ⅱ2型。长9段浊积岩对含油页岩段的有机质富集具有一定影响,浊积岩AB及ABC序列对底部沉积的泥岩、泥页岩有机质含量影响最大,其有机碳含量相对较低;浊积岩DE序列对底部沉积的泥岩、泥页岩有机质含量影响相对较小,有机质含量相对较高。
Based on core observation and grain size analysis of thin sections,turbidites were identified in Chang 9 Member of Triassic Yanchang Formation in the southern margin of Ordos Basin,and the vertical sedimentary characteristics of the typical Bouma sequence were revealed. Meanwhile,TOC and pyrolysis were tested for the samples of oil shale and organic rich shale in Chang 9 Member of Yanchang Formation in Ordos Basin. The authors analyzed the characteristics of turbidites and their influences on the enrichment of organic matter. The results showed that the kerogen of oil shale and mudstone in the semi-deep lake-deep lake area was mainly type II1,andthe kerogen of mudstone,shale and silty mudstone overlying and underlying the turbidite were mainly type III and type II2. The Chang 9 turbidites had some influences on the organic matter accumulation in the oil shale section.The AB and ABC sequences of turbidites had the greatest influence on the organic matter content in the underlying mudstone and shale deposited,and the organic carbon content was relatively low. The DE sequence of turbidite had relatively less influence on the content of organic matter in the underlying mudstone and shale,and the content of organic matter was relatively high.
Based on core observation and grain size analysis of thin sections,turbidites were identified in Chang 9 Member of Triassic Yanchang Formation in the southern margin of Ordos Basin,and the vertical sedimentary characteristics of the typical Bouma sequence were revealed. Meanwhile,TOC and pyrolysis were tested for the samples of oil shale and organic rich shale in Chang 9 Member of Yanchang Formation in Ordos Basin. The authors analyzed the characteristics of turbidites and their influences on the enrichment of organic matter. The results showed that the kerogen of oil shale and mudstone in the semi-deep lake-deep lake area was mainly type II1,andthe kerogen of mudstone,shale and silty mudstone overlying and underlying the turbidite were mainly type III and type II2. The Chang 9 turbidites had some influences on the organic matter accumulation in the oil shale section.The AB and ABC sequences of turbidites had the greatest influence on the organic matter content in the underlying mudstone and shale deposited,and the organic carbon content was relatively low. The DE sequence of turbidite had relatively less influence on the content of organic matter in the underlying mudstone and shale,and the content of organic matter was relatively high.
引文
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[5]朱静,朱亚军,辛红刚,等.鄂尔多斯盆地延长组长9油层组沉积特征[J].西北大学学报(自然科学版),2013,43(1):94-100.ZHU Jing,ZHU Ya-jun,XIN Hong-gang,et al. The sedimentation during Chang 9 oil formation in Yanchang Formation in Ordos Basin[J]. Journal of Northwest University(Natural Science Edition),2013,43(1):94-100.
[6]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-192.FU Qiang, LYU Miao-miao, LIU Yong-dou. Developmental characteristics of turbidite and its implication on petroleum geology in Late Triassic Ordos Basin[J]. Acta Sedimentologica Sinica,2008,26(2):186-192.
[7]杨仁超,何治亮,邱桂强,等.鄂尔多斯盆地南部晚三叠世重力流沉积体系[J].石油勘探与开发.2014,41(6):661-670.YANG Ren-chao,HE Zhi-liang,QIU Gui-qiang,et al.Late Triassic gravity flow depositional systems in the southern Ordos Basin[J]. Petroleum Exploration and Development,2014,41(6):661-670.
[8]陈全红,李文厚,郭艳琴,等.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义[J].地质学报,2006,80(5):656-663.CHEN Quan-hong,LI Wen-hou,GUO Yan-qin,et al.Turbidite systems and the significance of petroleum exploration of Yanchang Formation in the southern Ordos Basin[J]. Journal of Geology,2006,80(5):656-663.
[9]李祥辉,王成善,金玮.深海沉积理论发展及其在油气勘探中的意义[J].沉积学报,2009,27(1):77-84.LI Xiang-hui,WANG Cheng-shan,JIN Wei. A review on deep-sea sedimentation theory:significances to oil-gas exploration[J]. Acta Sedimentologica Sinica,2009,27(1):77-84.
[10]刘芬,朱筱敏,李洋,等.鄂尔多斯盆地西南部延长组重力流沉积特征及相模式[J].石油勘探与开发,2015,42(5):577-588.LIU Fen,ZHU Xiao-min,LI Yang,et al. Sedimentary characteristics and fades model of gravity flow deposits of Late Triassic Yanchang Formation in southwestern Ordos Basin,NW China[J]. Petroleum Exploration and Development,2015,42(5):577-588.
[11]何自新.鄂尔多斯盆地演化与油气[M].北京石油工业出版社,2003:95-105.HE Zi-xin. Evolution and petroleum of Ordos Basin[M]. Beijing:Petroleum Industry Press,2003:95-105.
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[14]赵俊兴,李风杰,申晓莉,等.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式[J].石油学报,2008,29(3):389-394.ZHAO Jun-xing, LI Feng-jie, SHEN Xiao-li, et al.Sedimentary characteristics Chang 6 and Chang 7 and development pattern of turbidity event of oil reservoirs in the southern Ordos Basin[J]. Acta Petrolei Sinica,2008,29(3):389-394.
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[18]葛云锦,贺永红,焦健,等.鄂尔多斯盆地周长地区长9油层组浊积岩及致密油勘探意义[J].中国石油勘探,2015,20(4):30-36.GE Yun-jin,HE Yong-hong,JIAO Jian,et al. Tight oil exploration of Chang 9 turbidity in Zhouchang area of Ordos Basin[J]. China Petroleum Exploration,2015,20(4):30-36.
[19]岳会雯,周瑶琪,梁文栋.深水浊积岩有机质富集规律研究进展[J].地质科技情报,2016,35(6):112-120.YUE Hui-wen, ZHOU Yao-qi, LIANG Wen-dong.Progress in accumulation of organic matter in deepwater turbidite[J]. Geological Science and Technology Information,2016,35(6):112-120.
[20]何玉平,刘招君,董清水,等.依舒地堑汤原断陷古近系湖底扇沉积与层序特征[J].世界地质,2006,25(1):23-28.HE Yu-ping,LIU Zhao-jun,DONG Qing-shui,et al.Sedimentary and sequence characteristics of Paleogene sublacustrine fan of Tangyuan fault depression in Yishu Graben[J]. Global Geology,2006,25(1):23-28.
[21]付金华,郭正权,邓秀芹.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J].古地理学报,2005,7(1):34-43.FU Jin-hua,GUO Zheng-quan,DENG Xiu-qin. Sedimentary facies of the Yanchang Formation of Upper Triassic and petroleum geological implication in southwestern Ordos Basin[J]. Journal of Palaeogeography,2005,7(1):34-43.
[22]张亚楠,梁俊红,李小东,等.辽西义县组尖山沟层沉积环境粒度分析[J].世界地质,2006,25(4):373-389.ZHANG Ya-nan,LIANG Jun-hong,LI Xiao-dong,et al. Grain size analysis of sedimentary environment from Jianshangou bed of Yixian Formation in western Liaoning,China[J]. Global Geology,2006,25(4):373-389.
[23] Stow D A V,Huc A Y,Bertrand P. Depositional processes of black shales in deep water[J]. Marine and Petroleum Geology,2001,18(4):491-498.
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