川西南地区中二叠统热液白云岩特征及勘探思路
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摘要
热液白云石化可形成优质白云岩储层。通过岩石矿物学观察、地球化学分析以及地震资料解释,四川盆地西南地区中二叠统栖霞组—茅口组广泛发育的砂糖状白云岩为热液白云石化成因,具有如下特征:①白云岩出现频率较高,单层厚度较大,宿主灰岩主要为生屑灰岩和生屑泥晶灰岩;②中—粗晶白云岩发育残余生屑结构,生屑溶蚀后部分被自生石英和鞍形白云石充填,孔隙类型主要为晶间孔和溶蚀孔,平均孔隙度为6%~10%;③基质白云岩包裹体均一温度明显高于白云石化作用时的地层温度,具有偏负的δ18 O值、高的87Sr/86Sr比值以及明显的正Eu异常;④白云岩产出井附近发育基底断裂,且在对应的地震剖面上见"下凹"反射特征。在紧邻基底断裂带,热液白云石化作用强,白云岩储层厚度大,横向连续性好,适合构造圈闭勘探;在远离基底断裂带,热液白云石化作用弱,白云岩储层厚度较小,横向连续性较差,适合岩性-构造圈闭勘探。
Hydrothermal dolomitation can form high-quality dolomite reservoirs.Through mineralogic observations,geochemical analyses and comprehensive interpretations of seismic profiles,the Middle Permian saccharoidal dolomite in Qixia and Maokou formations which are related with hydrothermal dolomitization have following characteristics:(1) higher occurrence frequency,greater thickness in a single layer(5~40m),host limestone dominated by bioclasitc limestone or bioclasitc micrite;(2) residual bioclasitc textures developed in mesocrystalline-macrocrystallinpore dolomites and bioclast-dissolved pores partly filled with authigenic quartz and saddle dolostone mostly with intergranular and corroded pores,which porosity averages between 6%and 10%;(3) an obviously higher homogenization temperature of dolomite matrix(125~178℃) than the stratum temperature during dolomitization,which is indicated by more negative oxygen isotopes(-10.1‰~-11.42‰),higher 87Sr/86Sr(0.709 194~0.710 174)and positive Eu anomaly;(4) well-developed basement faults adjacent to dolomite-producing wells and a "sunken" reflection in corresponding seismic profiles.Generally speaking,close to basement fault zones,hydrothermal fluid dolomitization is intensive and dolomite reservoirs are thick and in good lateral continuity,where structure traps are exploration target.On the contrary,far from basement fault zones,hydrothermal fluid dolomitization is weak and dolomite reservoirs are thin and in poor lateral continuity,where hydrocarbon exploration should focus on litho-structure traps.
引文
[1]何幼斌,冯增昭.四川盆地及其周缘下二叠统细—粗晶白云岩成因探讨[J].江汉石油学院学报,1996,18(4):15-20.He Youbin,Feng Zengzhao.Origin of fine-to coarse-grained dolos-tones of Lower Permian in Sichuan Basin and its peripheral regions[J].Journal of Jianghan Petroleum Institute,1996,18(4):15-20.
    [2]石新,王兴志,张帆,等.川西北地区栖霞组白云岩储集层研究[J].西南石油学院学报:自然科学版,2005,27(2):13-16.Shi Xin,Wang Zhixin,Zhang Fan,et al.The study of dolomitereservoirs in Qixia Formation in the northwest of Sichuan region[J].Journal of Southwest Petroleum institute:Science&Tech-nology Edition,2005,27(2):13-16.
    [3]张荫本.四川盆地二叠系中的白云岩[J].石油学报,1982,3(1):29-33.Zhang Yinben.Dolomite of Middle Permian in Sichuan Basin[J].Acta Petrolei Sinica,1982,3(1):29-33.
    [4]金振奎,冯增昭.滇东—川西下二叠统白云岩的形成机理——玄武岩淋滤白云化[J].沉积学报,1999,17(3):383-389.Jin Zhenkui,Feng Zengzhao.Origin of dolostones of the Lower Per-mian in East Yunnan—West Sichuan:dolomitization through leachingof basalts[J].Acta Sedimentologica Sinica,1999,17(3):383-389.
    [5]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.Zheng Rongcai,Hu Zhonggui,Feng Qingping,et al.Genesis ofdolomite reservoir of the Changxing Formation of Upper Permi-an,northeast Sichuan Basin[J].Journal of Mineralogy and Pe-trology,2007,27(4):78-84.
    [6]刘树根,邓宾,李智武,等.盆山结构与油气分布——以四川盆地为例[J].岩石学报,2011,27(3):621-635.Liu Shugen,Deng Bin,Li Zhiwu,et al.The texture of sedimenta-ry basin-orogenic belt system and its influence on oil/gas distri-bution:a case study from Sichuan Basin[J].Acta Petrologica Sin-ica,2011,27(3):621-635.
    [7]刘树根,黄文明,陈翠华,等.四川盆地震旦系—古生界热液作用及其成藏成矿效应初探[J].矿物岩石,2008,28(3):41-50.Liu Shugen,Huang Wenming,Chen Cuihua,et al.Primary study onhydrothermal fluids activities and there effectiveness on petroleumand mineral accumulation of Sinian System-Palaezoic in Sichuan Basin[J].Journal of Mineralogy and Petrology,2008,28(3):41-50.
    [8]罗志立.峨眉地裂运动和四川盆地天然气勘探实践[J].新疆石油地质,2009,30(4):419-424.Luo Zhili.Emei taphrogenesis and natural gas prospecting practices inSichuan Basin[J].Xinjiang Petroleum Gelogy,2009,30(4):419-424.
    [9]陈轩,赵文智,张利萍,等.川中地区中二叠统构造热液白云岩的发现及其勘探意义[J].石油学报,2012,33(4):562-569.Chen Xuan,Zhao Wenzhi,Zhang Liping,et al.Discovery and ex-ploration significance of structure-controlled hydrothermal dolo-mites in the Middle Permian of the central Sichuan Basin[J].Ac-ta Petrolei Sinica,2012,33(4):562-569.
    [10]四川油气区石油地质编写组.中国石油地质志(卷10):四川油气区[M].北京:石油工业出版社,1989.Editorial Board of Petroleum Geology of Sichuan Oil Province.Petroleum geology of China(Vol.10):Sichuan oil province[M].Beijing:Petroleum Industry Press,1989.
    [11]陈明启.川西南下二叠阳新统白云岩成因探讨[J].沉积学报,1989,7(2):45-50.Chen Mingqi.A discussion of the origin of YangXin dolomite ofLower Permian in southwest Sichuan[J].Acta SedimentologicaSinica,1989,7(2):45-50.
    [12]Qing H,Mountjoy E W.Formation of coarsely crystalline,hydro-thermal dolomite reservoirs in the Presqu’ile barrier,Western Can-ada sedimentary basin[J].AAPG Bulletin,1994,78(1):55-77.
    [13]Davies G R,Boreen T,Smith L.Hydrothermal dolomite and leachedlimestone reservoirs:respresentative core fabrics and facies[R].Cal-gary:AAPG Annual Meeting,2005.
    [14]Davies G R,Smith L B Jr.Structurally controlled hydrothermaldolomite reservoir facies:an overview[J].AAPG Bulletin,2006,90(11):1641-1690.
    [15]陈代钊.构造-热液白云岩化作用与白云岩储层[J].石油与天然气地质,2008,29(5):614-622.Chen Daizhao.Structure-controlled hydrothermal dolomitizationand hydrothermal dolomite reservoirs[J].Oil&Gas Geology,2008,29(5):614-622.
    [16]黄思静,石和,张萌,等.上扬子石炭―二叠纪海相碳酸盐的锶同位素演化与全球海平面变化[J].沉积学报,2001,19(4):481-487.Huang Sijing,Shi He,Zhang Meng,et al.Strontium isotope evo-lution and global seal level changes of carboniferous and Permianmarine carbonate,Upper Yangtze Platform[J].Acta Sedimento-logica Sinica,2001,19(4):481-487.
    [17]Cai C,Li K,Li H,et al.Evidence for cross formational hot brineflow from integrated 87Sr/86 Sr,REE and fluid inclusions of theOrdovician veins in Central Tarim,China[J].Applied Geochem-istry,2008,23(8):2226-2235.
    [18]Jones C E,Jenkyns H C.Seawater strontium isotopes,oceanic anoxicevents,and seafloor hydrothermal activity in the Jurassic and Creta-ceous[J].American Journal of Science,2001,301(2):112-149.
    [19]马永生,蔡勋育,赵培荣,等.四川盆地大中型天然气田分布特征与勘探方向[J].石油学报,2010,31(3):347-354.Ma Yongsheng,Cai Xunyu,Zhao Peirong,et al.Distribution andfurther exploration of the large-medium sized gas field in SichuanBasin[J].Acta Petrolei Sinica,2010,31(3):347-354.
    [20]赵孟军,宋岩,秦胜飞,等.中国中-西部4种新生代挤压盆地成藏地质条件及成藏期次[J].地质科学,2007,42(2):234-252.Zhao Mengjun,Song Yan,Qin Shengfei,et al.Geological condi-tions and oil-gas filling periods of 4 type Cenozoic compressionalbasins in central-western China[J].Scientia Geologica Sinica,2007,42(2):234-252.
    [21]王一刚,余晓锋,杨雨,等.流体包裹体在建立四川盆地古地温剖面研究中的应用[J].地球科学——中国地质大学学报,1998,23(3):285-288.Wang Yigang,Yu Xiaofeng,Yang Yu,et al.Applications of fluidinclusions in the study of Paleo-Geotemperature in Sichuan Basin[J].Earth Science:Journal of China University of Geosciences,1998,23(3):285-288.
    [22]伍大茂,吴乃苓,郜建军.四川盆地古地温研究及其地质意义[J].石油学报,1998,19(1):18-23.Wu Damao,Wu Nailing,Gao Jianjun.Paleogeotemperature in Si-chuan Basin and its geological significance[J].Acta Petrolei Sini-ca,1998,19(1):18-23.
    [23]陈轩,刘银河,林年添,等.塔中低凸起北斜坡奥陶系碳酸盐岩储层特征及其勘探意义[J].石油地球物理勘探,2011,46(3):463-470.Chen Xuan,Liu Yinhe,Lin Niantian,et al.Characteristics andexplorations significance of Ordovician carbonate reservoirs inthe North Slope of Tazhong Lower Uplift,Tarim Basin[J].OilGeophysical Prospecting,2011,46(3):463-470.
    [24]苏劲,张水昌,杨海军,等.断裂系统对碳酸盐岩有效储层的控制及其成藏规律[J].石油学报,2010,31(2):196-203.Su Jin,Zhang Shuichang,Yang Haijun,et al.Control of fault systemto formation of effective carbonate reservoir and the rules of petrole-um accumulation[J].Acta Petrolei Sinica,2010,31(2):196-203.

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