Characteristics and geological significance of corrosion karst at the top of Middle Triassic in northwestern Sichuan Basin
Wu Bing1, Jin Xin2, Shi Zhi-Qiang1, Nereo Preto2, Du Yi-Xing1
1 Insitute of Sedimentary Geology,Chengdu University of Technology,Chegndu 610059,Sichuan; 2 Department of Geosciences,University of Padova,Via Gradenigo 6,35131 Padua,Italy
Abstract The corrosion karst at the top of the Middle Triassic was widely found at the Jinhe section in Shifang and in most parts of the Sichuan Basin. With the recent field studies,we identified this karst surface in the Triassic sections at Hanwang Guanyinya in Mianzhu,Huanglianqiao and Ma'antang in Jiangyou along the northwest margin of the Sichuan Basin. The karst yielded in top Tianjingshan Formation and its origin is thought to be related to strong tectonic activity and global sea-level fall that resulted in long-time exposure of the Middle Triassic. The main forms of the karst are as follows: (1)exposed erosion and discontinuous sedimentary surfaces,(2)solution channels, solution fractures and associated carbonate and terrigenous clastic fillings,(3)exposed clay layer,and(4)karst breccia. The exposed erosion and discontinuous sedimentary surfaces are most typical of birdeye structures or stromatactis,and at the Hanwang Guanyinya section in Mianzhu, they are most developed. The fillings of solution channels and fractures are mainly carbonate and terrigenous debris,commonly developed at the Ma'antang section in Jiangyou,Hanwang Guanyinya section in Mianzhu and Jinhe section in Shifang. The related dissolution joints and dissolution ditches are nearly vertical,with different widths and depths,and are filled with carbonate breccia,sparite, dolomite or terrigenous clay. The exposure soil is mainly confined to Huanglianqiao section in Jiangyou where two sets of exposure soils,about 5~20 cm thick each,contain iron minerals and the overlying and underlying intervals are dark gray limestone deposited in a lagoon paleoenvironment. The karst breccia is most common at Hanwang Guanyinya section in Mianzhu,with a maximum breccia size of up to 15×20 cm. The angular karst breccia is surrounded by dark carbonate matrix rich in mud and organic matter. The discovery of the corrosion-type karst at or near the top of the Tianjingshan Formation can provide the basis for regional stratigraphic isochronous correlation. In addition,the paleo-karst oil/gas accumulations can be formed in the carbonate rocks at the upper Tianjingshan and Leikoupo Formations with dissolution pores and fractures as the main storage space.
Fund:Financially supported by the National Natural Science Foundation of China(Nos. 41572085,41272131)
Corresponding Authors:
Shi Zhi-Qiang,born in 1974,is a professor. He is mainly engaged in sedinentology. E-mail: szqcdut@163.com.
About author: Wu Bing,born in 1990,is a master degree candidate. He is mainly engaged in sedinentology. E-mail: 468090453@qq.com.
Cite this article:
Wu Bing,Jin Xin,Shi Zhi-Qiang et al. Characteristics and geological significance of corrosion karst at the top of Middle Triassic in northwestern Sichuan Basin[J]. JOPC, 2018, 20(1): 133-146.
Wu Bing,Jin Xin,Shi Zhi-Qiang et al. Characteristics and geological significance of corrosion karst at the top of Middle Triassic in northwestern Sichuan Basin[J]. JOPC, 2018, 20(1): 133-146.
[1] 艾合买提江. 2009. 塔河油田碳酸盐岩缝洞系统成因及模式研究. 中国石油大学(华东)博士论文, 66-72. [Ahmatjan A. 2009. Genesis and Mode of Fracture-Vuggy System in Carbonate Rocks,Tahe Oilfield,China. Doctoral Dissertation of China University of Petroleum(East China),66-72] [2] 边兆祥,朱夔玉,金以钟,贾疏源. 1980. 四川龙门山印支期构造发展特征. 四川地质学报,(1): 1-10. [Bian Z X,Zhu K Y,Jin Y Z,Jia S Y. 1980. The development characteristics of Longmen Mountains in Sichuan during Indosinian. Acta Geologica Sichuan,(1): 1-10] [3] 车用太,鱼金子. 1985. 中国的喀斯特. 北京: 科学出版社, 2-17. [Che T Y,Yu J Z. 1985. Karst of China. Beijing: Science Press, 2-17] [4] 陈洪德,徐胜林,林良彪,侯明才,陈安清. 2011. 龙门山造山带晚三叠世构造隆升的分段性及层序充填响应. 沉积学报, 29(4): 622-630. [Chen H D,Xu S L,Lin L B,Hou M C,Chen A Q. 2011. Segmental uplift of Longmenshan orogen and sequence filling characteristic of western Sichuan Foreland-like Basin,Later Triassic. Acta Sedimentologica Sinica, 29(4): 622-630] [5] 陈培元,杨辉廷,刘学利,钟学彬,杨新涛. 2014. 塔河油田6~7区孔洞型碳酸盐岩储集层建模. 地质评论, 60(4): 884-892. [Chen P Y,Yang H T,Liu X L,Zhong X B,Yang X T. 2014.3D Modeling of vug carbonate reservoir in the Sixth-Seventh blocks of Tahe Oilfield,Tarim Basin. Geological Review, 60(4): 884-892] [6] 邓康龄,何鲤,秦大有,何志国. 1982. 四川盆地西部晚三叠世早期地层及其沉积环境. 石油与天然气地质, 3(3): 204-210. [Deng K L,He L,Qin D Y,He Z G. 1982. The Earlier Late Triassic sequence and its sedimentary environment in western Sichuan Basin. Oil & Gas Geology, 3(3): 204-210] [7] 杜怡星,时志强. 2017. 川西北地区上三叠统卡尼阶古喀斯特的发现及其研究意义. 沉积学报, 35(3): 38-48. [Du Y X,Shi Z Q. 2017. Discovery of the Upper Triassic karst in northwest Sichuan Basin,China: Implications for Carnian tectonic and paleoclimatic evolution. Acta Sedimentologica Sinica, 35(3): 38-48] [8] 辜学达,刘啸虎. 1997. 四川省岩石地层. 湖北武汉: 中国地质大学出版社. [Gu X D,Liu X H. 1997. Lithostratigraphy of Sichuan Province. Wuhan, Hubei: China University of Geosciences Press] [9] 周志澄,陈迪舒,罗辉,李罡,Willems H,蔡华伟,许波,王学恒,陈金华. 2014. 四川江油马鞍塘上三叠统天井山组Glossifungites遗迹相. 古生物学报, 53(3): 302-307. [Zhou Z C,Chen D S,Luo H,Li G,Willems H,Cai H W,Xu B,Wang X H,Chen J H. 2014. Glossifungites ichnofacies from the Upper Triassic Tianjingshan Formation,Maantang,Jiangyou,Sichuan. Acta Palaeontologica Sinica, 53(3): 302-307] [10] 金鑫,时志强,王艳艳,段雄,程明. 2015. 晚三叠世中卡尼期极端气候事件: 研究进展及存在问题. 沉积学报, 33(1): 106-115. [Jin X,Shi Z Q,Wang Y Y,Duan X,Cheng M. 2015. Mid-Carnian(LateTriassic)extreme climate event: Advances and unsolved problems. Acta Sedimentologica Sinica, 33(1): 105-115] [11] 雷国良,张忠敏. 1995. 喀斯特黏土矿物的稀土元素实验研究. 贵州科学, 13(3): 12-15. [Lei G L,Zhang Z M. 1995. A study on the ree of karst clay minerals. Guizhou Science, 13(3): 12-15] [12] 李坤,赵锡奎,王国芝,邓广军,吕志洲. 2006. 龙门山中段前山带构造特征及含油气性研究. 地质找矿论丛, 21(4): 282-287. [Li K,Zhao X K,Wang G Z,Deng G J,Lü Z Z. 2006. Study on structural features and presence of oil in the fore-mountain belt of the middle Longmen mountains. Contributions to Geology and Mineral Resources, 21(4): 282-287] [13] 李勇,苏德辰,董顺利,颜照坤,贺佩,闫亮. 2011. 龙门山前陆盆地底部不整合面: 被动大陆边缘到前陆盆地的转换. 岩石学报, 27(8): 2413-2422. [Li Y,Su D C,Dong S L,Yan Z K,He P,Yan L. 2011. The recognition of the basal unconformity in the Longmenshan foreland basin: Transition from passive continent margin to foreland basin. Acta Petrologica Sinica, 27(8): 2413-2422] [14] 刘树根,杨荣军,吴熙纯,孙玮,陈杨. 2009. 四川盆地西部晚三叠世海相碳酸盐岩—碎屑岩的转换过程. 石油与天然气地质, 30(5): 556-565. [Liu S G,Yang R J,Wu X C,Sun W,Chen Y. 2009. The Late Triassic transition from marine carbonate rock to clastics in the western Sichuan Basin. Oil & Gas Geology, 30(5): 556-565] [15] 刘持恒,胡作维,李云,罗文. 2015. 江油含增地区中三叠统雷口坡组—天井山组界线沉积微相分析. 岩性油气藏, 27(1): 66-73. [Liu C H,Hu Z W,Li Y,Luo W. 2015. Sedimentary microfacies analysis of the Middle Triassic Leikoupo Formation-Tianjingshan Formation boundary in Hanzeng area,Jiangyou. Lithologic Reservoirs, 27(1): 66-73] [16] 孟昱璋,徐国盛,刘勇,杨成,袁海锋,梁家驹. 2015. 川西雷口坡组古风化壳喀斯特气藏成藏条件. 成都理工大学学报: 自然科学版, 42(1): 70-79. [Meng Y Z,Xu G S,Liu Y,Yang C,Yuan H F,Liang J J. 2015. Hydrocarbon accumulation conditions of the weathering crust paleo karst gas reservoir of Leikoupo Formation,West Sichuan,China. Journal of Chengdu University of Technology(Science & Technology Edition), 42(1): 70-79] [17] 马治鸾,陈洪德,钟怡江,林良彪,李洁,王琦,龙宇. 2012. 四川盆地东北部元坝地区中三叠统雷口坡组四段古岩溶特征及其油气地质意义. 地质通报, 31(4): 577-585. [Ma Z L,Chen H D,Zhong Y J,Lin L B,Li J,Wang Q,Long Y. 2012. Paleo karst ification in carbonates of 4th Member of Middle Triassic Leikoupo Formation in northeastern Sichuan basin and its petroleum geological significance. Geological Bulletin of China, 31(4): 577-585] [18] 彭靖淞,刘树根,赵霞飞,吴熙纯,杨荣军,孙玮,顾炎午. 2009. 川西中三叠统天井山组风暴沉积的发现及古地理意义. 岩性油气藏, 21(1): 83-88,111. [Peng J S,Liu S G,Zhao X F,Wu X C,Yang R J,Sun W,Gu X W. 2009. Discovery of tempestite in Middle Triassic Tianjingshan Formation in western Sichuan and its paleogeographic significance. Lithologic Reservoirs, 21(1): 83-88,111] [19] 时志强. 2006. 龙门山推覆构造带中段中、上三叠统油气聚集与保存条件研究. 中石化西南分公司博士后出站报告, 9-15. [Shi Z Q. 2006. A Study of Oil and Gas Accumulation and Preservation Conditions in the Middle and Top triassic in Longmen Nappe Belt. Sinopec Southwest Branch Postdoctoral Report, 9-15] [20] 时志强,钱利军,曾德勇,欧莉华. 2010a. 晚三叠世卡尼期碳酸盐生产危机在东特提斯地区的地质记录. 地质论评, 56(3): 321-328. [Shi Z Q,Qian L J,Zeng D Y,Ou L H. 2010a. Geological records of Late Triassic Carnian carbonate productivity crisis in eastern tethys region(SW China). Geological Review, 56(3): 321-328] [21] 时志强,马利梅,罗啸泉. 2010b. 龙门山地区关口断裂形成与演化分析. 地质学报, 30(2): 132-135. [Shi Z Q,Ma L M,Luo X Q. 2010b. Formation and evolution of the Guankou Fault in the Longmen Mountains. Acta Geologica Sinica, 30(2): 132-135] [22] 谭秀成,肖笛,陈景山,李凌,刘宏. 2015. 早成岩期喀斯特化研究新进展及意义. 古地理学报, 17(4): 442-456. [Tan X C,Xiao D,Chen J X,Li L,Liu H. 2015. New advance and enlightenment of Eogenetic Karstification. Journal of Palaeogeography(Chinese Edition), 17(4): 442-456] [23] 田景春,时国,陈辉,张翔,何明喜,郭双亭,杜建波,曹建康. 2009. 南华北地区奥陶系古喀斯特特征及其储集层前景. 成都理工大学学报: 自然科学版, 36(6): 598-604. [Tian J C,Shi G,Chen H,Zhang X,He M X,Guo S T,Du J B,Cao J K. 2009. Palaeokarst characteristics and reservoir prospects of Ordovician in the south of North China. Journal of Chengdu University of Technology(Science & Technology Edition), 36(6): 598-604] [24] 王宝清,张金亮. 1996. 古岩溶的形成条件及特征. 西安石油学院学报, 11(4): 4,8-10. [Wang B Q,Zhang J L. 1996. The Formation conditions and characteristics of paleaokarst. Journal of Xi'an Petroleum Institute, 11(4): 4,8-10] [25] 王雪莲,王长陆,陈振林,田继军. 2005. 鄂尔多斯盆地奥陶系风化壳岩溶储集层研究. 特种油气藏, 12(3): 32-35. [Wang X L,Wang C L,Chen Z L,Tian J J. 2005. Study of Ordovician weathering crust karst reservoirs in Ordos Basin. Special Oil and Gas Reservoirs, 12(3): 32-35] [26] 王增银,沈继方,万军伟. 1998. 清江高坝地区古岩溶角砾岩特征及形成条件. 地球科学: 中国地质大学学报, 23(5): 524-528. [Wang Z Y,Shen J F,Wan J W. 1998. An analysis of the formation of paleokarst breccia and the karst evolution in Gaobazhou area of Qingjiang river. Earth Science: Journal of China University of Geosciences, 23(5): 524-528] [27] 王运生. 1992. 龙门山晚三叠早期菊石. 成都地质学院学报, 19(4): 28-36. [Wang Y S. 1992. The earlier late triassic ammonites from Longmen Mountains. Journal of Chengdu College of Geology, 19(4): 28-36] [28] 吴熙纯,李培华. 2008. 四川龙门山前晚侏罗世砾岩喀斯特. 见: 陈安泽(编). 中国地质学会旅游地质与地质公园研究分会第23届年会暨二连恐龙地质公园建设与旅游发展战略研讨会论文集. 内蒙古: 二连浩特,34-39. [Wu X C,Li P H. 2008. Late Jurassic conglomerate Karst in Longmen mountain in Sichuan. In: Chen A Z(ed). The Twenty-third Annual Conference of Tourism Geology and Geopark Research Symposium of the Chinese Geological Society and the Symposium on the ER Lian Dinosaur Geological Park Construction and Tourism Development Strategy Symposium. Inner Mongolia: Erenhot,34-39] [29] 杨荣军,刘树根,吴熙纯,赵霞飞,彭靖松,孙玮. 2008. 龙门山前缘上三叠统马鞍塘组沉积分布特征及其控制因素. 成都理工大学学报: 自然科学版, 35(4): 455-462. [Yang R J,Liu S G,Wu X C,Zhao X F,Peng J S,Sun W. 2008. Distribution characteristics and controlling factors of Upper Triassic Ma'antang Formation in the front of Longmen Mountians,Sichuan,China. Journal of Chengdu University of Technology(Science & Technology Edition), 35(4): 455-462] [30] 杨遵仪,张舜新. 2000. 中国地层典·三叠系. 北京: 地质出版社, 57,69,95. [Yang Z Y,Zhang S X. 2000. Stratigraphical Lexicon of China·Triassic. Beijing: Geological Publishing House, 57,69,95] [31] 曾德铭,王兴志,张帆,宋章强,张若祥,朱永刚,李跃刚. 2007. 四川盆地西北部中三叠统雷口坡组储集层研究. 古地理学报, 9(3): 254-266. [Zeng D M,Wang X Z,Zhang F,Song Z Q,Zhang R X,Zhu Y G,Li Y G. 2007. Study on reservoir of the Leikoupo Formation of Middle Triassic in northwestern Sichuan Basin. Journal of Palaeogeography(Chinese Edition), 9(3): 254-266] [32] 张彪,王中蛟,时志强,程明,段雄,金鑫,崔磊. 2013. 川西北绵竹汉旺马鞍塘组与小塘子组间不整合面的发现及意义. 成都理工大学学报: 自然科学版, 40(1): 80-88. [Zhang B,Wang Z J,Shi Z Q,Cheng M,Duan X,Jin X,Cui L. 2013. Discovery and geological significance of unconformity surface between Upper Triassic Ma'antang Formation and Xiaotangzi Formation in Hanwang of Mianzhu in Northwest Sichuan,China. Journal of Chengdu University of Technology: Science & Technology Edition, 41(1): 80-88] [33] 张厚淼. 2010. 裂缝性储集层饱和度解释模型研究. 中国石油大学(华东)硕士学位论文, 11-15. [Zhang H M. 2010. Saturation Interpretation Model Study on Fractured Reservoirs. Master's Dissertation of China University of Petroleum(East China), 11-15] [34] 张少妮. 2012. 古岩溶的识别标志及地球化学研究方法评述. 内蒙古石油化工,(7): 110-113. [Zhang S N. 2012. The recognition of paleokarst and geochemical methods for research. Inner Mongolia Petrochemical Industry,(7): 110-113] [35] 朱智鹏,黄勇,汪洋. 2013. 四川盆地东部石炭系黄龙组岩溶角砾碳酸盐岩特征. 天然气工业, 33(5): 40-45. [Zhu Z P,Huang Y,Wang Y. 2013. Characteristics of karst brecciated Carboniferous Huanglong Formation in the eastern Sichuan Basin. Natural Gas Industry, 33(5): 40-45] [36] Andrej K. 2011. The origin and evolution of the term “karst”.Carsologica Sinica, 30(2): 157-162. [37] Esteban M. 1991. Palaeokarst: Practical applications. In: Wright V P,Esteban M,Smart P L(eds). Palaeokarsts and Palaeokarstic Reservoirs. University of Reading, Postgraduate Research for Sedimentology, PRIS Contribution No.152, 89-119. [38] Shi Z Q,Preto N,Jiang H S,Krystyn L,Zhang Y,Ogg J G,Jin X,Yuan J L,Yang X K,Du Y X. 2017. Demise of Late Triassic sponge mounds along the northwestern margin of the Yangtze Block,South China: Related to the Carnian Pluvial Phase?. Palaeogeography,Palaeoclimatology,Palaeoecology, 474: 247-263. [39] Xiao D,Tan X C,Xi A H,Liu H,Shan S J,Xia Ji W,Cheng Y,Lian C B. 2016. An inland facies-controlled eogenetic karst of the carbonate reservoir in the Middle Permian Maokou Formation,southern Sichuan Basin,SW China. Marine and Petroleum Geology, 72: 218-233.
