胡广成,鲍志东,刘桂珍,张震,李勇
HU Guangcheng,BAO Zhidong,LIU Guizhen,ZHANG Zhen,LI Yong

• 1:中国石油勘探开发研究院
• 2:中国石油大学油气资源与探测国家重点实验室
• 3:西安石油大学地球科学与工程学院
• 4:中国地质科学院矿产资源研究所

摘要(Abstract)：

黔北地区下三叠统茅草铺组发育泥粉晶白云岩和砂屑白云岩,但其成因机理鲜有研究。基于古地理环境和岩石学特征分析,开展了碳氧同位素、微量元素和阴极发光等地球化学研究。结果表明:泥粉晶白云岩和砂屑白云岩均为低温成因,泥粉晶白云岩具有负的δ~(18)O值和正的δ~(13)C值,Sr和Na含量较高,发育石膏假晶,形成于高盐度的强烈蒸发潮坪或瀉湖环境,是准同生白云化成因;砂屑白云岩具有负的δ~(18)O值和负的δ~(13)C值,具有最低的Sr和Na含量,砂屑为泥晶结构,磨圆差—中等,大多杂乱排列,亮晶方解石或白云石胶结,为先期沉积的准同生白云岩经搬运再次沉积而成;部分样品Sr含量异常,表明此类白云岩叠加了埋藏白云化作用。
Micritic dolomite and dololithite are well developed in Lower-Triassic Maocaopu Formation in North Guizhou,while there are few researches on their generating mechanism. Based on the analyses on the palaeogeographic environment and the petrological characteristics,the geochemical studies on the carbon-oxygen isotopes,the trace elements,cathodeluminescence and so on were conducted. The achievements show that both of the dolomites are resulted from the low temperature,the former is characterized by the negative δ~(18)O value and positive δ~(13)C value,the much higher contents of Sr and Na,well-developed gypsum pseudocrystals and resulted from high-salinity intensive evaporate tidal flat or lagoon environments i. e. penecontemporaneous dolomitization genesis; the latter is characterized by the negative δ~(18)O value and negative δ~(13)C value,the lowest contents of Sr and Na,micrit-ic structure,moderate-poorly rounded psephicity,generally random arrangement,cemented by the sparry calcite and dolomite,deposited again after transported for the previously penecontemporaneous dolomite; there are abnormal contents of Sr value for the partial samples,these reveal that this kind of the dolomite may involve in the burial dolomitization.

关键词(KeyWords)： 白云岩成因;地球化学特征;下三叠统;茅草铺组;黔北
dolomite origin;geochemical characteristic;Lower Triassic;Maocaopu Formation;North Guizhou

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究”(2016ZX05029005)

作者(Author): 胡广成,鲍志东,刘桂珍,张震,李勇
HU Guangcheng,BAO Zhidong,LIU Guizhen,ZHANG Zhen,LI Yong

DOI: 10.19597/j.issn.1000-3754.201707019

参考文献(References)：

• [1]范嘉松.世界碳酸盐岩油气田的储层特征及其成藏的主要控制因素[J].地学前缘,2005,12(3):23-30.
• [2]马锋,杨柳明,顾家裕,等.世界白云岩油气田勘探综述[J].沉积学报,2011,29(5):1010-1021.
• [3]马永生,蔡勋育,李国雄.四川盆地普光大型气藏基本特征及成藏富集规律[J].地质学报,2005,79(6):858-865.
• [4]余江浩,周世卿,王亿,等.中扬子长阳地区寒武系牛蹄塘组页岩气成藏地质条件[J].油气地质与采收率,2016,23(5):9-15.
• [5]Tucker M E,Wright V P.Carbonate Sedimentology[M].Oxford:Blackwell Science,1990:365-400.
• [6]赵澄林,朱筱敏.沉积岩石学[M].3版.北京:石油工业出版社,2001:321-338.
• [7]肖恩照,隋明园,Khalid Latif,等.微生物白云岩形成机制研究进展与存在问题[J].大庆石油地质与开发,2017,36(2):26-32.
• [8]John A L,William B H,Williams N S.Fractured hydrothermal dolomite reservoirs in the Devonian Dundee Formation of the central Michigan basin[J].AAPG Bulletin,2006,90(11):1787-1801.
• [9]Langhorne B,Smith J R.Origin and reservoir characteristics of Upper Ordovician Trenton-Black River hydrothermal dolomite reservoirs in New York[J].AAPG Bulletin,2006,90(11):1691-1718.
• [10]Lonnee J,Machel H G.Pervasive dolomitization with subsequent hydrothermal alteration in the Clarke Lake gas field,Middle Devonian Slave Point Formation,British Columbia,Canada[J].AAPG Bulletin,2006,90(11):1739-1761.
• [11]朱金富,于炳松,黄文辉,等.塔里木盆地塔中地区晚寒武世—奥陶世碳酸盐岩碳、氧同位素特征[J].大庆石油地质与开发,2008,27(1):39-42.
• [12]邵红梅,冯子辉,王成,等.塔里木盆地古城地区下古生界白云岩储层类型及成因[J].大庆石油地质与开发,2014,33(5):111-116.
• [13]卢曦.塔里木盆地古城地区下古生界碳酸盐岩成岩作用及储层孔隙特征[J].大庆石油地质与开发,2016,35(4):15-21.
• [14]赵春明,张建民,李祖兵.渤中28-1油田奥陶系碳酸盐岩储层特征及主控因素[J].大庆石油地质与开发,2017,36(1):27-34.
• [15]刘策,曹颖辉,周波,等.古城地区中下奥陶统白云岩碳氧同位素特征及成因[J].特种油气藏,2017,24(2):30-34.
• [16]Thomas R T,Sibley D F.Petrographic and geochemical characteristics of dolomite types and the origin of ferroan dolomite in the Trenton Formation,Ordovician,Michigan Basin,U.S.A.[J].Sedimentology,1986,33(1):61-86.
• [17]黄思静,Qing Hairuo,裴昌蓉,等.川东三叠系飞仙关组白云岩锶含量、锶同位素组成与白云石化流体[J].岩石学报,2006,22(8):2123-2132.
• [18]Kania T,Fukuia M,Isozaki F,et al.The Paleozoic minimum of 87Sr/86Sr ratio in the Capitanian(Permian)mid-oceanic carbonates:A critical truning point in the Late Paleozoic[J].Journal of Asian Earth Sciences,2008,32(1):22-33.
• [19]贵州省地质矿产局.贵州省区域地质志[M].北京:地质出版社,1987:554-616.
• [20]冯增昭,鲍志东,李尚武,等.中国南方早中三叠世岩相古地理[M].北京:石油工业出版社,1997:67-104.
• [21]殷鸿福,童金南,丁梅华,等.扬子区晚二叠世—中三叠世海平面变化[J].地球科学,1994,19(5):628-632.
• [22]胡广成,鲍志东,张震,等.贵州桐梓松坎剖面中,下三叠统岩石学特征及沉积环境分析[J].古地理学报,2009,11(2):195-204.
• [23]王英华,张邵平,潘荣胜.阴极发光技术在地质学中的应用[M].北京:地质出版社,1990:52-68.
• [24]曾伟,黄先平,杨雨,等.川东北下三叠统飞仙关组白云岩成因及分布[J].西南石油大学学报(自然科学版),2007,29(1):19-22.
• [25]南君亚,叶健骝,王筑明,等.贵州二叠纪-三叠纪古气候和古海洋环境的地球化学研究[J].矿物学报,1998,18(2):239-249.
• [26]Blake D F,Peacor D R,Wilkinson B H.The sequence and mechanism of low-temperature dolomite Formation:calcian dolomites in a Pennsylvanian Echinoderm[J].Journal of Sedimentary Petrology,1982,52(1):59-70.
• [27]Vasconcelos C,Mckenzie J A,Bernasconi S,et al.Microbial mediation as a possible mechanism for natural dolomite formation at low temperatures[J].Nature,1995,377(6546):220-222.
• [28]郑荣才,胡忠贵,冯青平,等.川东北地区长兴组白云岩储层的成因研究[J].矿物岩石,2007,27(4):78-84.
• [29]Durocher S,Al-Aasm I S.Dolomitization and neomorphism of Mississippian(Visean)Upper Debolt Formation,Blueberry Field,Northeastern British Columbia:Geologic,Petrologic,and Chemical Evidence[J].AAPG Bulletin,1997,81(6):954-977.
• [30]陈更生,曾伟,杨雨,等.川东北部飞仙关组白云石化成因探讨[J].天然气工业,2005,25(4):40-43.