辽西地区下白垩统九佛堂组沉积与有机质发育特征
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摘要
辽西地区下白垩统九佛堂组是辽西勘探新区中生界重要的生油层位之一,其在建昌-喀左盆地分布面积广,厚206～2118m;在阜新-义县盆地中厚度相对较薄。有机地球化学分析表明,两盆地均发育有好-优质烃源岩,且有机质类型较好,整体处于低成熟演化阶段。九佛堂组二段主体为波动深湖相沉积,是烃源岩最有利发育层位,发育多套优质烃源岩,总有机碳含量平均9.5%,干酪根主要为Ⅰ型;九佛堂组一段、三段为河流-湖泊沉积体系,水体相对较浅,烃源岩发育特征较差。生物标志化合物分析表明,九佛堂组二段烃源岩形成于微咸水-半咸水、还原的湖相富粘土沉积环境。初步的成因分析表明,其形成是水体化学分层形成的良好保存条件与较高比例有机质输入共同作用的结果。
Lower Cretaceous Jiufotang Formation is one of the important source rock stratigraphic horizon in Mesozoic strata of western Liaoning Province. It is widespread in Jianchang-Kazuo Basin, with thickness of 206～2118 m, but is relatively thinner in Fuxin-Yixian Basin. Organic geochemistry analyses indicate the two basins have both developed good to excellent source rocks characterized by good kerogen type and low maturity. The second section of Jiufotang Formation, which was formed in flunctuating profundal facies, is optimistic source rock horizon with average TOC of 9.5% and kerogen ofⅠtype. The first and third sections of Jiufotang Formation, which were formed in fluvial-lacustrine facies, have relatively poor source rock development environment due to shallower water body. The biomarkers analyses indicate that source rocks in the second section of Jiufotang Formation were developed in a clay-rich reducing brackish lake. The preliminary genetic analysis indicates that the development of these source rocks was attributed to good conservation condition from chemical stratification of lake water body and relatively high primary production.
Lower Cretaceous Jiufotang Formation is one of the important source rock stratigraphic horizon in Mesozoic strata of western Liaoning Province. It is widespread in Jianchang-Kazuo Basin, with thickness of 206～2118 m, but is relatively thinner in Fuxin-Yixian Basin. Organic geochemistry analyses indicate the two basins have both developed good to excellent source rocks characterized by good kerogen type and low maturity. The second section of Jiufotang Formation, which was formed in flunctuating profundal facies, is optimistic source rock horizon with average TOC of 9.5% and kerogen ofⅠtype. The first and third sections of Jiufotang Formation, which were formed in fluvial-lacustrine facies, have relatively poor source rock development environment due to shallower water body. The biomarkers analyses indicate that source rocks in the second section of Jiufotang Formation were developed in a clay-rich reducing brackish lake. The preliminary genetic analysis indicates that the development of these source rocks was attributed to good conservation condition from chemical stratification of lake water body and relatively high primary production.
引文
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[32]彭平安,张文正,杨华,等.鄂尔多斯晚三叠世优质烃源岩发育的盆地化学动力学背景[C]//全国有机地球化学学术会议.2009.
[2]张树东.建昌-喀左盆地油气显示与油源分析[J].辽宁工程技术大学学报,2008,27(s1):48-50.
[3]付秋萍.建昌-喀左盆地石油地质条件初步分析[J].辽宁工程技术大学学报,2005,24(3):351-353.
[4]喻梓靓,朱华钰.辽宁西部建昌盆地九佛堂组油页岩沉积学特征[J].石油天然气学报,2013,35(1):53-57.
[5]郭强,王宇林,钟大康,等.喀左盆地油页岩资源勘探前景[J].新疆石油地质,2011,(5):473-475.
[6]魏恒飞,王宇林,王威,等.喀左盆地九佛堂组沉积特征及演化研究[J].沉积学报,2009,27(2):273-279.
[7]魏恒飞,王宇林,王威,等.喀左盆地九佛堂组露头高分辨率层序地层划分[J].沉积学报,2009,27(6):1109-1115.
[8]赵政璋,赵贤正,何海清.中国石油近期新区油气勘探成果及面临的挑战与前景展望[J].中国石油勘探,2002,7(3):1-6.
[9]刘震,常迈,赵阳,等.低勘探程度盆地烃源岩早期预测方法研究[J].地学前缘,2007,14(4):159-167.
[10]张亚明,高玉娟,何保,等.建昌-喀左盆地中生代构造演化[J].辽宁工程技术大学学报,2005,24(6):20-22.
[11]段冶,张立君,李莉,等.辽西大平房-梅勒营子盆地九佛堂组珍稀化石层的划分与对比[J].世界地质,2006,25(2):113-119.
[12]黄庆华,马寅生,李永贤,等.阜新-义县盆地构造演化及应力场光弹性模拟分析[J]地球学报,1991,(1):21-34.
[13]张宏,柳小明,李之彤,等.辽西阜新-义县盆地及附近地区早白垩世地壳大规模减薄及成因探讨[J].地质论评,2005,51(4):360-372.
[14]王秀茹,路爱平,张欣宇.阜新盆地含油气地层特征[J].地层学杂志,2007,31(4):385-390.
[15]李亚平,董国义,范国清.辽西中生代含鸟层及上下层位的划分和时代[J].辽宁地质,1998,(3):175-184.
[16]Leythaeuser D.Effects of weathering on organic matter in shales[J].Geochimica Et Cosmochimica Acta,1973,37(1):113-120.
[17]孟元林,肖丽华,杨俊生,等.风化作用对西宁盆地野外露头有机质性质的影响及校正[J].地球化学,1999,(1):42-50.
[18]高岗,刚文哲,梁浩,等.风化作用对烃源岩地球化学特征的影响--以吐哈盆地石炭系-下二叠统烃源岩为例[J].中国石油勘探,2014,19(6):33-39.
[19]卢双舫.油气地球化学[M].北京:石油工业出版社,2008.
[20]成海燕,李安龙,龚建明.陆相烃源岩评价参数浅析[J].海洋地质动态,2008,24(2):6-10.
[21]Erik N Y,?z?elik O,Altunsoy M.Interpreting Rock-Eval pyrolysis data using graphs of S 2,vs.TOC:Middle TriassicLower Jurassic units,eastern part of SE Turkey[J].Journal of Petroleum Science&Engineering,2006,53(1/2):34-46.
[22]Dahl B,Bojesen-Koefoed J,Holm A,et al.A new approach to interpreting Rock-Eval S 2,and TOC data for kerogen quality assessment[J].Organic Geochemistry,2004,35(11/12):1461-1477.
[23]Langford F F.Interpreting Rock-Eval pyrolysis data using graphs of pyrolizable hydrocarbons vs.Total Organic Carbon[J].AAPGBulletin,1990,74(6):799-804.
[24]侯读杰,冯子辉.油气地球化学[M].北京:石油工业出版社,2011.
[25]Peters K E.Guidelines for evaluating petroleum source rock using programmed pyrolysis[J].AAPG Bulletin,1986,70(3):318-329.
[26]Brassell S C,Eglinton G,Maxwell J R,et al.Aquatic pollutants[M]Oxford:Pergamon Press,1978.
[27]Peters K E,Peters K E,Walters C C,et al.The biomarker guide[M].Cambridge:Cambridge University Press,2005.
[28]Huang W Y,Meinschein W G.Sterols as Ecological Indicators[J].Geochimica Et Cosmochimica Acta,1979,43(5):739-745.
[29]Volkman J K.A review of sterol markers for marine and terrigenous organic matter[J].Organic Geochemistry,1986,9(2):83-99.
[30]Sinninghe Damste J S,Kenig F,Koopmans M P,et al.Evidence for gammacerane as an indicator of water column stratification[J].Geochimica Et Cosmochimica Acta,1995,59(9):1895-1900.
[31]Bohacs K M,Carroll A R,Neal J E,et al.Lake-basin type,source potential,and hydrocarbon character:an integrated sequencestratigraphic-geochemical framework[C]//Lake basins through space and time:AAPG Studies in Geology,2000,46:3-34.
[32]彭平安,张文正,杨华,等.鄂尔多斯晚三叠世优质烃源岩发育的盆地化学动力学背景[C]//全国有机地球化学学术会议.2009.
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