西湖凹陷平湖组层序地层划分和聚煤特征
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摘要
西湖凹陷是我国东海盆地的一个次级凹陷,在凹陷断陷期的末期阶段发育的平湖组是一套含煤岩系,同时也是西湖凹陷的主力烃源岩。在对西湖凹陷地震、钻测井及岩心资料综合分析的基础上,在平湖组中识别出3个长期基准面旋回,其中发育了10个中期基准面旋回。平湖组发育煤层的主要沉积环境有潮汐影响的三角洲平原、潮汐影响的三角洲前缘的分流间湾和潮上带及辫状河三角洲前缘分流间湾。平湖组发育的3个层序是煤层发育的主要部位,其中长期基准面旋回LSC2是煤层最发育的层段。可容纳空间的大小控制着煤层在西湖凹陷平湖组短期基准面旋回中的发育位置:在高的可容纳空间背景下,煤层主要发育于短期基准面下降半旋回的中上部;在低的可容纳空间背景下,煤层主要发育于短期基准面旋回的最大可容纳空间处。
Xihu depression is a sub-depression of Donghai basin,China.Pinghu Formation developed in late faulting-subsiding period is a suit of coal-bearing series,and the most important source rock in Xihu depression.On the basis of comprehensive analysis of seismic,drilling,logging and core data,three long-term and ten mid-term base level cycles are recognized.The main sedimentary environment developing coal seam are tide influencing delta plain,interdistributary bay of tide influencing delta front,supralittoral zone,and interdistributary bay of braided delta front.These long-term base level cycles are mainly positions where coal seam growth,and the long-term base level cycle LSC2 is the most developing place of coal seam.The place of coal seam in short-term base level cycle was controlled by size of accommodation space.Coal seams were mainly developed in middle-upper part of decreasing short-term base level cycle on the background of high accommodation space;whereas coal seams were mainly developed in the maximum accommodation space of short-term base level cycle on the background of low accommodation space.
Xihu depression is a sub-depression of Donghai basin,China.Pinghu Formation developed in late faulting-subsiding period is a suit of coal-bearing series,and the most important source rock in Xihu depression.On the basis of comprehensive analysis of seismic,drilling,logging and core data,three long-term and ten mid-term base level cycles are recognized.The main sedimentary environment developing coal seam are tide influencing delta plain,interdistributary bay of tide influencing delta front,supralittoral zone,and interdistributary bay of braided delta front.These long-term base level cycles are mainly positions where coal seam growth,and the long-term base level cycle LSC2 is the most developing place of coal seam.The place of coal seam in short-term base level cycle was controlled by size of accommodation space.Coal seams were mainly developed in middle-upper part of decreasing short-term base level cycle on the background of high accommodation space;whereas coal seams were mainly developed in the maximum accommodation space of short-term base level cycle on the background of low accommodation space.
引文
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[20]宋小勇,储呈林,芮志峰.东海盆地西湖凹陷构造样式及其演化[J].高校地质学报,2010,16(1):86-93.Song Xiaoyong,Chu Chenglin,Rui Zhifeng.StructuralFramework and Evolution of Xihu Sag in East ChinaSea Basin[J].Geological Journal of China Universi-ties,2010,16(1):86-93.
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[23]余朝丰,陈建文,杜远生,等.东海西湖凹陷平湖组层序地层划分[J].海洋地质与第四纪地质,2007,27(5):85-90.Yu Chaofeng,Chen Jianwen,Du Yuansheng,et al.Di-vision of Sequence Stratigraphy of Pinghu Formationin Xihu Sag in East China Sea[J].Marine Geology&Quaternary Geology,2007,27(5):85-90.
[24]武法东,李思田,陆永潮,等.东海陆架盆地第三纪海平面变化[J].地质科学,1998,33(2):214-221.Wu Fadong,Li Sitian,Lu Yongchao,et al.The Tertia-ry Sea-Level Changes in the East China Sea Shelf Ba-sin[J].Scientia Geologica Sinica,1998,33(2):214-221.
[25]武法东,陆永潮,李思田,等.东海陆架盆地第三系层序地层格架与海平面变化[J].地球科学:中国地质大学学报,1998,23(1):13-20.Wu Fadong,Lu Yongchao,Li Sitian,et al.TertiarySequence Stratigraphic Framework and Sea-LevelChanges in the East China Sea Shelf Basin[J].EarthScience:Journal of China University of Geosciences,1998,23(1):13-20.
[26]许圣传,刘招君,董清水,等.陆相盆地含煤、油页岩和蒸发盐地层单元沉积演化[J].吉林大学学报:地球科学版,2012,42(2):296-303.Xu Shengchuan,Liu Zhaojun,Dong Qingshui,er al.Deposition and Sedimentary Evolution of Coal,OilShale and Evaporite-Bearing Strata in Terrestrial Ba-sins[J].Journal of Jilin University:Earth Science E-dition,2012,42(2):296-303.
[2]Bohacs K,Suter J.Sequence StratigraphicDistributionof Coaly Rocks:Fundamental Controls and ParalicExamples[J].AAPG Bulletin,1997,81(10):1612-1639.
[3]Diessel C F K,Boyd R,Wadsworth J,et al.On Ba-lanced and Unbalanced Accommodationr/Peat Accu-mulation Ratios in the Cretaceous Coals from GatesFormation,Western Canada,and Their Sequence-Stra-tigraphic Significance[J].International Journal of CoalGeology,2000,43(1/2/3/4):143-186.
[4]Diessel C F K,Gammidge L.Isometamorphic Varia-tions in the Reflectance and Fluorescence of Vitrinite:A Key to Depositional Environment[J].InternationalJournal of Coal Geology,1998,36(3/4):167-222.
[5]Holz M,Kalkreuth W,Banerjee I.Sequence Stratigra-phy of Paralic Coal-Bearing Strata:An Overview[J].International Journal of Coal Geology,2002,48(3/4):147-179.
[6]Shearer J C,Staub J R,Moore T A.The Conundrumof Coal Bed Thickness:A Theory for Stacked Mire Se-quences[J].The Journal of Geology,1994,102(5):611-617.
[7]Hamilton D S,Tadros N Z.Utility of Coal Seams asGenetic Stratigraphic Sequence Boundaries in Non-Ma-rine Basins:An Example from the Gunnedah Basin,Australia[J].AAPG Bulletin,1994,78(2):267-286.
[8]Aitken J F.Utility of Coal Seams as Genetic Strati-graphic Sequence Boundaries in Non-Marine Basins:An Example from the Gunnedah Basin,Australia:Discussion[J].AAPG Bulletin 1995,79(8):1179-1181.
[9]Banerjee J,Kalkreuth W,Davies E.Coal Seam Splitsand Transgressive-Regressive Coal Couplets:A Key toStratigraphy of High-Frequency Sequences[J].Geolo-gy,1996,24(11):1001-1004.
[10]李鑫,庄新国,周继兵,等.准东煤田中部矿区西山窑组巨厚煤层煤相分析[J].地质科技情报,2010,29(5):84-88.Li Xin,Zhuang Xinguo,Zhou Jibing,et al.Coal FaciesAnalysis of Thick Coal Seam of Middle Jurassic Xi-shanyao Formation in the Middle Part of EasternJjungger Coal Field,Xinjiang[J].Geological Scienceand Technology Information,2010,29(5):84-88.
[11]何起祥,业治铮,张明书,李浩.受限陆表海的海侵模式[J].沉积学报,1991,9(1):1-10.He Qixiang,Ye Zhizheng,Zhang Mingshu,et al.Transgression Model of Restricted Epicontinental Sea[J].Acta Sedimentologica Sinica,1991,9(1):1-10.
[12]李增学,李守春,魏久传.事件性海侵与煤聚集规律:鲁西晚石炭世富煤单元的形成[J].岩相古地理,1995,15(1):1-9.Li Zengxue,Li Shouchun,Wei Jiuchuan.Accumula-tion:An Example form the Late Carboniferous Cola-Rich Units in the Western Shandong Coal Fields[J].Sedimentary Facies and Palaeogeography,1995,15(1):1-9.
[13]李增学,李守春,魏久传.鲁西煤田内陆表海含煤层序的小层序类型及煤聚集规律[J].沉积学报,1996,14(3):38-46.Li Zengxue,Li Shouchun,Wei Jiuchuan.Types of Pa-rasequence and Law of Coal Accumulation of Coal-Bearing Sequence in the Paleozoic Epicontinental SeaBasin of Western Shandong Coal Field[J].ActaSedimentologica Sinica,1996,14(3):38-46.
[14]李增学,魏久传,韩美莲.海侵事件成煤作用:一种新的聚煤模式[J].地球科学进展,2001,16(1):120-125.Li Zengxue,Wei Jiuchuan,Han Meilian.Coal For-mation in Transgressive Events:A New Pattern ofCoal Accumulation[J].Advance in Earth Sciences,2001,16(1):120-125.
[15]李增学,徐继峰,郭建斌.华北陆表海盆地海侵事件聚煤作用研究[J].煤田地质与勘探,2002,30(5):1-5.Li Zengxue,Xu Jifeng,Guo Jianbin.Study on CoalAccumulation Under Marine Transgressive Events inthe Epicontinental Basin of North China[J].Coal Ge-ology&Exploration,2002,30(5):1-5.
[16]邵龙义,张鹏飞,窦建伟,等.含煤岩系层序地层分析的新认识:兼论河北晚古生代层序地层格架[J].中国矿业大学学报,1999,28(1):20-24.Shao Longyi,Zhang Pengfei,Dou Jianwei,et al.NewConsiderations on Coal Measures Sequence Stratigra-phy:A Case Study from the Late Paleozoic CoalMeasures in North Hebei[J].Journal of China Uni-versity of Mining&Technolougy,1999,28(1):20-24.
[17]邵龙义,鲁静,汪浩,等.近海型含煤岩系沉积学及层序地层学研究进展[J].古地理学报,2008,10(6):561-570.Shao Longyi,Lu Jing,Wang Hao,et al.Advances inSedimentology and Sequence Stratigraphy of ParalicCoal Measures[J].Journal of Palaeogeography,2008,10(6):561-570.
[18]张远兴,叶加仁,苏克露,等.东海西湖凹陷沉降史与构造演化[J].大地构造与成矿学,2009,33(2):215-223.Zhang Yuanxing,Ye Jiaren,Su Kelu,et al.The BurialHistory and Evolution of Xihu Depression[J].Geotec-tonica et Metallogenia,2009,33(2):215-223.
[19]何将启,梁世友,陈拥峰,等.东海盆地西湖凹陷新生代构造演化对油气的控制作用:以平湖组油气响应为例[J].石油实验地质,2008,30(3):221-226.He Jiangqi,Liang Shiyou,Chen Yongfeng,et al.Con-trol on Petroleum by Cenozoic Tectonic Evolution inthe Xihu Sag,the East China Sea Basin:Taking Petro-leum Response of the Pinghu Formation as an Exam-ple[J].Petroleum Geology&Experiment,2008,30(3):221-226.
[20]宋小勇,储呈林,芮志峰.东海盆地西湖凹陷构造样式及其演化[J].高校地质学报,2010,16(1):86-93.Song Xiaoyong,Chu Chenglin,Rui Zhifeng.StructuralFramework and Evolution of Xihu Sag in East ChinaSea Basin[J].Geological Journal of China Universi-ties,2010,16(1):86-93.
[21]翟玉兰.东海陆架盆地西湖凹陷古近系层序地层与沉积体系研究[D].青岛:中国海洋大学,2009.Zhai Yulan.The Study on the Sequence Stratigraphyand Sedimentary System in Paleogen of Xihu Sag inthe East China Sea Shelf Basin[D].Qingdao:OceanUniversity of China,2009.
[22]曹瑞成,李军辉,卢双舫,等.海拉尔盆地呼和湖凹陷白垩系层序地层特征及沉积演化[J].吉林大学学报:地球科学版,2010,40(3):535-541.Cao Ruicheng,Li Junhui,Lu Shuangfang,et al.Se-quence Stratigraphic Character and Sedimentary Evo-lution in Cretaceous in Huhehu Depression in HailaerBasin[J].Journal of Jilin University:Earth Science E-dition,2010,40(3):535-541.
[23]余朝丰,陈建文,杜远生,等.东海西湖凹陷平湖组层序地层划分[J].海洋地质与第四纪地质,2007,27(5):85-90.Yu Chaofeng,Chen Jianwen,Du Yuansheng,et al.Di-vision of Sequence Stratigraphy of Pinghu Formationin Xihu Sag in East China Sea[J].Marine Geology&Quaternary Geology,2007,27(5):85-90.
[24]武法东,李思田,陆永潮,等.东海陆架盆地第三纪海平面变化[J].地质科学,1998,33(2):214-221.Wu Fadong,Li Sitian,Lu Yongchao,et al.The Tertia-ry Sea-Level Changes in the East China Sea Shelf Ba-sin[J].Scientia Geologica Sinica,1998,33(2):214-221.
[25]武法东,陆永潮,李思田,等.东海陆架盆地第三系层序地层格架与海平面变化[J].地球科学:中国地质大学学报,1998,23(1):13-20.Wu Fadong,Lu Yongchao,Li Sitian,et al.TertiarySequence Stratigraphic Framework and Sea-LevelChanges in the East China Sea Shelf Basin[J].EarthScience:Journal of China University of Geosciences,1998,23(1):13-20.
[26]许圣传,刘招君,董清水,等.陆相盆地含煤、油页岩和蒸发盐地层单元沉积演化[J].吉林大学学报:地球科学版,2012,42(2):296-303.Xu Shengchuan,Liu Zhaojun,Dong Qingshui,er al.Deposition and Sedimentary Evolution of Coal,OilShale and Evaporite-Bearing Strata in Terrestrial Ba-sins[J].Journal of Jilin University:Earth Science E-dition,2012,42(2):296-303.
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