川东北盘龙洞长兴组-飞仙关组白云岩化特征及成因

doi:10.11743/ogg20120111

摘要/Abstract

摘要：

通过系统的野外调查和薄片鉴定,结合电子探针分析,认为四川盆地东北部盘龙洞长兴组-飞仙关组地层普遍发生白云岩化作用。不同类型的白云岩较发育,在纵向分布上具明显的分带性,由下至上依次为:生屑(含砂砾屑)白云岩、礁白云岩、结晶白云岩、鲕粒白云岩和泥-微晶白云岩。进一步研究表明,上述白云岩的成因模式主要有三种,即混合水白云岩化、渗透回流白云岩化和准同生白云岩化。混合水白云岩化为生屑(含砂砾屑)白云岩和礁白云岩的主要形成模式,这两类白云岩保持了岩石原始的沉积结构,白云岩化受原始结构的影响,具有离散的δ¹³C值和较负的δ¹⁸O值,反映其形成于有大气淡水参与的相对开放的成岩环境。渗透回流白云岩化为结晶白云岩和鲕粒白云岩的主要形成机制,这两类白云岩具有一致的δ¹³C值和相对较高的δ¹⁸O值,较高的Fe、Mn含量。准同生白云岩化是泥-微晶白云岩的成岩模式,岩石以岩性致密,碳氧同位素值集中偏高为特征。

关键词: 白云岩化, 成因, 长兴组, 飞仙关组, 盘龙洞, 四川盆地

Abstract:

Systematic field investigation and thin section observation as well as electron microprobe determination reveal that dolomitization is common in the Changing and Feixianguan formations in Panlongdong,northeastern Sichuan Basin.Various types of dolomites are developed and distributed vertically in obvious zonation.From bottom to top,they are biological clasitic dolomite,reef dolomite,crystalline dolomite,oolitic dolomite and micrite dolomite respectively.Our study showed that three genetic models could account for the formation process of the dolomites,including mixed-water dolomitization,infiltration and circumfluence dolomitization as well as penecontemporaneous dolomitization.The biological clasitic and reef dolomites were mainly formed through the mixed-water dolomitization,which occurred in relatively open diagenesis environment with meteoric water input.These dolomites had different δ¹³C values and more negative δ¹⁸O values and remained original sedimentary structure of rocks which restricted dolomitization.The infiltration and circumfluence dolomitization resulted in the formation of the crystalline and oolitic dolomites which have same δ¹³C values,less negative δ¹⁸O valuse,Fe and Mn contents.The penecontemporaneous dolomitization created the micrite dolomite with tight lithology and less negative δ¹³C and δ¹⁸O values.

Key words: dolomitization, genesis, Changing Formation, Feixianguan Formation, Panlongdong, northeastern Sichuan Basin

中图分类号:

TE122.2

陈琪,胡文瑄,李庆,等. 川东北盘龙洞长兴组-飞仙关组白云岩化特征及成因[J]. 石油与天然气地质, 2012, 33(1): 84-93. doi: 10.11743/ogg20120111 Chen Qi,Hu Wenxuan,Li Qing,et al. Characteristics and genesis of dolomitization in Changxing and Feixianguan Formations in Panlongdong,northeastern Sichuan Basin[J]. Oil & Gas Geology, 2012, 33(1): 84-93. doi: 10.11743/ogg20120111

参考文献

[1] 戴金星,黄士鹏,刘岩,等.中国天然气勘探开发60年的重大进展[J].石油与天然气地质,2010,31(6):689-698. Dai Jinxing,Huang Shipeng,Liu Yan et.al.Significant advancem ent in natural gas exploration and developm ent in China during the past sixty years[J].Oil & Gas Geology,2010,31(6):689-698 [2] 王一刚,文应初,洪海涛,等.川东北三叠系飞仙关组深层鲕滩气藏勘探目标[J].天然气工业,2004,24(12): 5-9. Wang Yigang,Wen Yingchu,Hong Haitao,et.al.Exploation target of the deep oolotic beach gas reservoir of the taiassic system Feixianguan formation in northeast part of Sichuan Basin[J]Natural Gas Industry,2004,24(12):5-9. [3] 王一刚,洪海涛,夏茂龙,等.四川盆地二叠,三叠系环海槽礁,滩富气带勘探[J].天然气工业,2008,28(01): 22-27. Wang Yigang,Hong Haitao,Xia Maolong,et.al.Exploation of reef-bank gas reservoirs surrounding Permian and Traiassic troughs in Sichuan Basin[J]Natural Gas Industry,2008,28(01):22-27. [4] 陈洪德,钟怡江,侯明才,等.川东北地区长兴组-飞仙关组碳酸盐岩台地层序充填结构及成藏效应[J].石油与天然气地质,2009,30(5):539-547. Chen Hongde,Zhong Yijiang,Hou Mingcai,et al.Sequence styles and hydrocarbon accumulation effects of carbonate rock platform in the Changxing-Feixianguan formations in the northeastern Sichuan Basin[J].Oil & Gas Geology,2009,30(5):539-547. [5] 朱忠发,刘建清.上扬子台地晚二叠世礁相油气藏的断块构造控制与勘探方法建议[J].石油与天然气地质,2009,30(2):168-176. Zhu Zhongfa,Lu Jiangqing.Control of fault blocks upon the Late Permian reservoirs of reef facies in the Upper Yangtze Platform and exploration suggestions[J].Oil & Gas Geology,2009,30(2):168176. [6] 史建南,郑荣才,冯青平,等.川东北长兴组埋藏白云石化流体来源与油气倒灌式成藏[J]天然气工业,2009,29(03): 5-8. Shi Jiannan,Zhen Rongcai,Feng Qingping,et.al.Fluid origin of burial dolomitization and hydrocarbon accumulation model of backward charging in Changxing formation,NE Sichuan basin[J].Natural Gas Industry,2009,29(03): 5-8. [7] 郭彤楼.川东北地区飞仙关组鲕滩储层成岩作用——以宣汉-达县及元坝区块为例[J].石油与天然气地质,2010,31(5):620-631. Guo Tonglou.Diagenesis of the Feixianguan oolitic shoal reservoirs in the northeastern Sichuan Basin-examples from Xuanhan-Daxian and Yuanba areas[J].Oil & Gas Geology,2010,31(5):620-631. [8] 胡文瑄,陈琪,王小林,等.白云岩储层形成演化过程中不同流体作用的稀土元素判别模式[J].石油与天然气地质,2010,31(6):810-818. HuWenxuan,Chen Qi,Wang Xiaolin,et al.REE m odels for the discrim ination of fluids in the formation and evolution of dolomite reservoirs[J].Oil & Gas Geology,2010,31(6):810-818. [9] 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(04): 40-41. Chen Gengsheng,Zeng Wei,Yang Yu,et al.Discussion on dolomitization genesis of Feixianguan formation in Northeastern Sichuan[J]Natural Gas Industry,2005,24(04):40-41. [10] 黄思静,Hairuoqing,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(08): 2123-2132. Huang Sijing,Hairuoqing,Pei Changrong,et al.Strontium concentration,isotope composition and dolomitization fluids in the Feixianguan Formation of Triassic,Eastern Sichuan of China.[J].Acta Petrologica Sinica.2006,22(08): 2123-2132. [11] 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(04): 78-84. Zheng Rongcai,Hu Zhonggui,Feng Qingping,et al.Genesis of dolomite of the Changxing formation Upper Permian,northeast Sichuan Basin[J].Journal of Mineralogy and Petrology.2007,27(04): 78-84. [12] 高梅生,郑荣才,文华国,等.川东北下三叠统飞仙关组白云岩成因——来自岩石结构的证据[J].成都理工大学学报(自然科学版),2007,34(03): 297-304. Gao Meisheng,Zheng Rongcai,Wen Huaguo,et al.Lithological characteristics of dolomite in the Lower Triassic Feixianguan Formation of the NE Sichuan Basin,China[J].Journal of Chengdu University of Technology(Science & Technology Edition).2007,34(03): 297-304 [13] 张婷婷,刘波,秦善.川东北二叠系-三叠系白云岩成因研究[J].北京大学学报(自然科学版),2008,44(05): 799-809. Zhang Tingting,Liu Bo,Qin Shan.The origin of Permian and Triassic dolostones in Northeastern Sichuan Province,China[J].Acta Scientiarum Naturalium Universitatis Pekinensis.2008,44(05): 799-809. [14] 黄思静,佟宏鹏,刘丽红,等.川东北飞仙关组白云岩的主要类型、地球化学特征和白云化机制[J].岩石学报,2009,25(10): 2363-2372. Huang sijing,Tong Hongpeng,Liu Lihong,et al.Petrography,geochemistry and dolomitizaiton mechanisms of Feixianguan dolomites in Triassic,NE Sichuan,China.[J] Acta Petrologica Sinica.2009,25(10): 2363-2372. [15] 牟传龙,马永生,王瑞华,等.川东北地区上二叠统盘龙洞生物礁成岩作用研究[J].沉积与特提斯地质,2005(Z1): 198-202. Mou Chuanlong,Ma Yongsheng,Wang Ruihua,et al.Diagenesis of the Upper Permian Panlongdong organic reefs in northeastern Sichuan[J].Sedimentary Geology and Tethyan Geology.2005(Z1): 198-202. [16] 魏国齐,杨威,张林,等.川东北飞仙关组鲕滩储层白云石化成因模式[J].天然气地球科学,2005,16(02):162-166. Wei Guoqi Yang Wei,Zhang Lin,et al.Dolomization genetic of Feixianguan group oolitic beach reservoir in northeast Sichuan Basin[J].Natural Gas Geoscience.2005,16(02): 162-166. [17] 罗平,苏立萍,罗忠,等.激光显微取样技术在川东北飞仙关组鲕粒白云岩碳氧同位素特征研究中的应用[J].地球化学,2006,35(03): 325-330. Luo Ping,Su Liping,Luo Zhong,et al.Application of laser micro-sampling technique to analysis of C and O isotopes of oolitic dolomites in Feixianguan Formation,Northeast Sichuan[J].Geochimica.2006,35(03): 325-330. [18] 郑荣才,耿威,郑超,等.川东北地区飞仙关组优质白云岩储层的成因[J].石油学报,2008,29(06): 815-821. Zheng Rongcai,Gong Wei,Zheng Chao,et al.Genesis of dolostone reservoir of Feixianguan Formation in Lower Triassic of northeast Sichuan Basin[J].Acta Petrolei Sinica.2008,29(06): 815-821. [19] 郑荣才,文华国,郑超,等.川东北下三叠统飞仙关组白云岩成因——来自岩石结构与Sr同位素和Sr含量的证据[J].岩石学报.2009,25(10): 2459-2468. Zheng Rongcai,Wen Huaguo,Zheng Chao,et al.Genesis of dolostone of the Feixianguan Formation,Lower Triassic in the NE Sichuan basin:Evidences from rock structure and strontium content and isotopic composition[J] Acta Petrologica Sinica,2009,25(10): 2459-2468. [20] 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,2007,29(01):19-22. Zeng Wei,Huang Xianping,Yang Yu,et al.The origin and distribution of dolostone in Feixianguan Formation in Lower Triassic series,Northeast Sichuan[J].Journal of Southwest Petroleum University.2007,29(01): 19-22. [21] 杨晓萍,赵文智,曹宏,等.川东北三叠系飞仙关组鲕滩气藏有利储集层的形成与分布[J].石油勘探与开发,2006,33(01): 17-21. Yang Xiaoping,Zhao Wenzhi,Cao Hong,et al.Formation and distribution of Triassic Feixianguan oolitic bank favorable reservoir in the NE Sichuan Basin[J].Petroleum Exploration and Development,2006,33(01): 17-21. [22] 陈辉,田景春,张翔,等.川东北地区下三叠统飞仙关组鲕滩白云岩成因[J].天然气工业,2008,28(01): 42-46. Chen Hui,Tian Jingchun,Zhang Xiang,et al.Dolomization genetic of the Lower Triassic Lower Triassic group oolitic beach in Northeastern Sichuan Basin[J].Natural Gas Industry,2008,28(01): 42-46. [23] 苏立萍,罗平,胡社荣,等.川东北罗家寨气田下三叠统飞仙关组鲕粒滩成岩作用[J].古地理学报,2004,6(02): 182-190. Su Liping,Luo Ping,Hu Sherong,et al.Diagenesis of oolitic bank of the Feixianguan Formation of Lower Triassic in Luojiazhai Gas Field,northeastern Sichuan Province[J].Journal of Palaeogeography,2004,6(02):182-190. [24] 牟传龙,谭钦银,王立全,等.四川宣汉盘龙洞晚二叠世生物礁古油藏的发现及其重要意义[J].地质论评,2003(03). Mou Chuanlong,Tan Qinyin,Wang Liquan,et al.The discoverery and their importance of the Late Permian organic reefal oil pool in Panlongdong,Xuanhan,Sichuan[J].Geological Review,2003(03). [25] 牟传龙,谭钦银,余谦,等.四川宣汉盘龙洞晚二叠世生物礁古油藏剖面序列[J].沉积与特提斯地质,2003,23(03): 60-64. Mou Chuanlong,Tan Qinyin,Yu Qian,et al.The Late Permian organic reefal oil pool section in Panlongdong,Xuanhan,Sichuan[J].Sedimentary Geology and Tethyan Geology,2003,23(03) :60-64. [26] 牟传龙,谭钦银,余谦,等.川东北地区上二叠统长兴组生物礁组成及成礁模式[J].沉积与特提斯地质,2004,24(03): 65-71. Mou Chuanlong,Tan Qinyin,Yu Qian,et al.The organic reefs and their reef-forming model for the Upper Permian Changxing Formation in northeastern Sichuan[J].Sedimentary Geology and Tethyan Geology,2004,24(03):65-71. [27] 李小燕,王琪,张瑞,等.川东北地区上二叠统盘龙洞生物礁储层特征及其主控因素分析[J].天然气地球科学,2009,20(01): 63-69. Li Xiaoyan,Wang Qi,Zhang Rui,et al.Reservoir Characteristics and Main Controlling Factors of Upper Permian Panlongdong Organic Reefs in Northeastern Sichuan[J].Natural Gas Geoscience,2009,20(1):63-69. [28] 马永生,牟传龙,谭钦银,等.达县-宣汉地区长兴组-飞仙关组礁滩相特征及其对储层的制约[J].地学前缘,2007,14(01): 182-192. Ma Yongsheng,Mou Chuanlong,Tan Qinyin,et al.Reef-bank features of Permian Changxing Formation and Triassic Feixianguan Formation in the Daxian-Xuanhan Area,Sichuan Province,South China and constraint for the reservoirs of natural gas[J].Earth Science Frontiers,2007,14(01):182-192. [29] 倪新锋,陈洪德,田景春,等.川东北地区长兴组-飞仙关组沉积格局及成藏控制意义[J].石油与天然气地质,2007,28(04): 458-465. Ni Xinfeng,Chen Hongde,Tian Jingchun,et al.Sedimentary framework of Changxing-Feixianguan Formations and its control on reservoiring in northeastern Sichuan basin[J].Oil & Gas Geology,2007,28(04):458-465. [30] 王一刚,张静,刘兴刚,等.四川盆地东北部下三叠统飞仙关组碳酸盐蒸发台地沉积相[J].古地理学报,2005,7(03): 357-371. Wang Yigang,Zhang Jing,Liu Xinggang,et al.Sedimentary facies of evaporative carbonate platform of the Feixianguan Formation of Lower Triassic in northeastern Sichuan Basin[J].Journal of Palaeogeography,2005,7(03):357-371. [31] Badiozamani K.The Dorag dolomitization model-application to the Middle Ordovician of Wisconsin[J].Journal of Sedimentary Petrology,1973,43(4): 965-984. [32] Ward W C,Halley R B.Dolomitization in a mixing zone of near-seawater composition,late Pleistocene,northeastern Yucatan Peninsula[J].Journal of Sedimentary Research,1985,55:407-420 [33] Hard L A.Dolomitization;a critical view of some current views[J].Journal of Sedimentary Research,1987,57:166-183 [34] Warren J.Dolomite: occurrence,evolution and economically important associations[J].Earth-Science Review.2000,52(3): 1-81. [35] Veizer J,Hoefs J.The nature of¹⁸ O/¹⁶O and ¹³ C/¹²C secular trends in sedimentary carbonate rocks[J].Geochimica et Cosmochimica Acta,1976,40(11): 1387-1395. [36] Moore C H.Carbonate reservoirs: porosity evolution and diagenesis in a sequence stratigraphic framework[M].Elsevier Science,2001.