Sequence stratigraphy and lithofacies paleogeography of the Middle–Upper Cambrian Xixiangchi Group in the Sichuan Basin and its adjacent area, SW China
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摘要
Based on isotopic, lithologic and electrical data and logging cycle analysis technique, stratigraphic sequences in the Middle-Upper Cambrian Xixiangchi Group in the Sichuan Basin and its adjacent area are divided, and its sedimentary characteristics and evolution are analyzed. The Xixiangchi Group can be divided into 5 third-order sequences(Sql-Sq5), of which sequences Ⅰ to Ⅲ(Sql-Sq3) are relatively complete, sequences Ⅳ and Ⅴ are denuded in the Late Cambrian because of the Dian-Chuan paleo-uplifts.Third-order sequences of the Xixiangchi Group in this area have the characteristics of thin in the west and thick in the east, showing that the Caledonian paleo-uplift is a synsedimentary paleo-uplift and the paleogeomorphology in the platform is a gentle slope. Sequence Ⅰdevelops high stand systems tract and transgressive systems tract. The other third-order sequences are dominated by highstand systems tracts, and the transgressive systems tracts last shortly in time and are limited in area. The basic features of evaporative-restricted platform of gentle slope type developed continuously in the sedimentary period of the Xixiangchi Group, its sedimentary environment of "high in west and low in east" and the change of micro paleogeomorphology in the platform control the continuous development of sedimentary facies. Open platform is developed only in sequence Ⅰ and sequence Ⅱ, and the inner beach of the platform and the edge beach of the platform are mostly developed in sequence Ⅱ and sequence Ⅲ. It indicates that there are two platform margin zones in the study area,a relatively stable, large-scale platform marginal zone in NE Guizhou-Western Hunan and Hubei, and a moving and small-scale platform marginal zone in North Chongqing-Western Hubei.
Based on isotopic, lithologic and electrical data and logging cycle analysis technique, stratigraphic sequences in the Middle-Upper Cambrian Xixiangchi Group in the Sichuan Basin and its adjacent area are divided, and its sedimentary characteristics and evolution are analyzed. The Xixiangchi Group can be divided into 5 third-order sequences(Sql-Sq5), of which sequences Ⅰ to Ⅲ(Sql-Sq3) are relatively complete, sequences Ⅳ and Ⅴ are denuded in the Late Cambrian because of the Dian-Chuan paleo-uplifts.Third-order sequences of the Xixiangchi Group in this area have the characteristics of thin in the west and thick in the east, showing that the Caledonian paleo-uplift is a synsedimentary paleo-uplift and the paleogeomorphology in the platform is a gentle slope. Sequence Ⅰdevelops high stand systems tract and transgressive systems tract. The other third-order sequences are dominated by highstand systems tracts, and the transgressive systems tracts last shortly in time and are limited in area. The basic features of evaporative-restricted platform of gentle slope type developed continuously in the sedimentary period of the Xixiangchi Group, its sedimentary environment of "high in west and low in east" and the change of micro paleogeomorphology in the platform control the continuous development of sedimentary facies. Open platform is developed only in sequence Ⅰ and sequence Ⅱ, and the inner beach of the platform and the edge beach of the platform are mostly developed in sequence Ⅱ and sequence Ⅲ. It indicates that there are two platform margin zones in the study area,a relatively stable, large-scale platform marginal zone in NE Guizhou-Western Hunan and Hubei, and a moving and small-scale platform marginal zone in North Chongqing-Western Hubei.
Based on isotopic, lithologic and electrical data and logging cycle analysis technique, stratigraphic sequences in the Middle-Upper Cambrian Xixiangchi Group in the Sichuan Basin and its adjacent area are divided, and its sedimentary characteristics and evolution are analyzed. The Xixiangchi Group can be divided into 5 third-order sequences(Sql-Sq5), of which sequences Ⅰ to Ⅲ(Sql-Sq3) are relatively complete, sequences Ⅳ and Ⅴ are denuded in the Late Cambrian because of the Dian-Chuan paleo-uplifts.Third-order sequences of the Xixiangchi Group in this area have the characteristics of thin in the west and thick in the east, showing that the Caledonian paleo-uplift is a synsedimentary paleo-uplift and the paleogeomorphology in the platform is a gentle slope. Sequence Ⅰdevelops high stand systems tract and transgressive systems tract. The other third-order sequences are dominated by highstand systems tracts, and the transgressive systems tracts last shortly in time and are limited in area. The basic features of evaporative-restricted platform of gentle slope type developed continuously in the sedimentary period of the Xixiangchi Group, its sedimentary environment of "high in west and low in east" and the change of micro paleogeomorphology in the platform control the continuous development of sedimentary facies. Open platform is developed only in sequence Ⅰ and sequence Ⅱ, and the inner beach of the platform and the edge beach of the platform are mostly developed in sequence Ⅱ and sequence Ⅲ. It indicates that there are two platform margin zones in the study area,a relatively stable, large-scale platform marginal zone in NE Guizhou-Western Hunan and Hubei, and a moving and small-scale platform marginal zone in North Chongqing-Western Hubei.
引文
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[30]LI Lei,XIE Jinsong,DENG Hongbin,et al.Study on characteristics and its stratigraphic classification and correlation of Cambrian in Sichuan Basin.Geology and Mineral Resources of South China,2012,28(3):197-202.
[31]XIA Jiwen,LI Ling,LUO Bing,et al.Depositional system analysis of the Cambrian in the southwest of Sichuan Basin.Journal of Southwest Petroleum University,2007,29(4):21-25.
[32]MEN Yupeng,XU Xiaosong,MOU Chuanlong,et al.Sedimentary facies and palaeogeography of the Cambrian evaporates in the middle-upper Yangtze area.Sedimentary Geology and Tethyan Geology,2010,30(3):58-64.
[33]LIN Yaoting.Cambrian bittern sediment characteristic and finding potassium prospect in Sichuan Basin.Journal of Salt Lake Research,2009,17(2):13-20.
[34]MEI Mingxiang.Sequence stratigraphic framework and its palaeogeographic setting for the Loushanguan Group dolostones of Cambrian in upper Yangtze region.Journal of Palaeogeography,2007,9(2):117-132.
[35]ZUO Jingxun,PENG Shanchi,ZHU Xuejian.Carbon isotope composition of Cambrian carbonate rocks in Yangtze Platform,South China and its geological implications.Geochimica,2008,37(2):118-128.
[36]LIU Baojun,YE Hongzhuan,PU Xinchun.Cambrian carbonate gravity flow deposits in Guizhou and Hunan.Oil&Gas Geology,1990,1l(3):235-246.
[2]FENG Zengzhao,PENG Yongmin,JIN Zhenkui,et al.Lithofacies palaeogeography of Cambrian in South China.Journal of Palaeogeography,2001,3(1):1-14.
[3]LU Yanhao.The proceedings of national conference on stratigraphy:Cambrian system of China.Beijing:Science Press,1962.
[4]WANG Sufen,LI Wei,ZHANG Fan,et al.Developmental mechanism of advantageous Xixiangchi group reservoirs in Leshan-Longnüsi palaeohigh.Petroleum Exploration and Development,2008,35(2):170-l74.
[5]LI Wei,YU Huaqi,DENG Hongbin.Stratigraphic division and correlation and sedimentary characteristics of the Cambrian in central-southern Sichuan Basin.Petroleum Exploration and Development,2012,39(6):681-690.
[6]LI Wei,JIA Peng,FAN Ru,et al.Carbon isotope characteristics of the Middle-Upper Cambrian Xixiangchi Group and boundary marks of Furongian Series in Sichuan Basin and its adjacent area.Natural Gas Industry,2017,37(10):1-10.
[7]JIA Peng,LI Wei,LU Yuanzheng,et al.Carbon and oxygen isotopic compositions and their evolution records of the Xixiangchi Group in sedimentary sequences of central-southern Sichuan Basin and their geological implications.Geoscience,2016,30(6):1329-1338.
[8]JIA Peng,LI Ming,LU Yuanzheng,et al.Sequence stratigraphic subdivision and establishment of sequence stratigraphic framework in the Cambrian Xixiangchi Group of Sichuan Basin.Geological Science and Technology Information,2017,36(2):119-127.
[9]WANG Chuanshang,LI Xubing,LI Zhihong,et al.Cambrian sequence-stratigraphy in the middle and upper Yangtze Platform.Journal of Stratigraphy,2012,36(4):773-783.
[10]MEI Mingxiang,MA Yongsheng,ZHANG Hai,et al.Sequence-stratigraphic frameworks for the Cambrian of the Upper-Yangtze region:Ponder on the sequence stratigraphic background of the Cambrian biological diversity events.Journal of Stratigraphy,2007,31(1):68-78.
[11]NIO S D,BROUWER J,SMITH D,et a1.Spectral trend attribute analysis:Applications in the stratigraphic analysis of wireline logs.First Break,2005,23(4):71-75.
[12]PENG Shanchi.A new global framework with four series for Cambrian syetem.Journal of Stratigraphy,2006,30(2):147-148.
[13]PENG Shanchi.Revision on Cambrian chronostratigraphy of south China and related remarks.Journal of Stratigraphy,2008,32(3):239-244.
[14]PENG Shanchi,BABCOCK L E.Newly proposed global chronostatigraphic subdivision on Cambrian System.Journal of Stratigraphy,2005,29(1):92-96.
[15]XUE Liangqing.The research status,methods and prospects of sequence stratigraphy.Petroleum Exploration and Development,1995,22(5):8-13.
[16]DENG Hongwen,XU Changgui,WANG Hongliang.Sequence stratigraphy and source-reservoir-cap rock assemblages of upper Jurassic in Ludong sag.Oil&Gas Geology,1998,19(4):275-279.
[17]NISHIMURA R,ASANO F,SUZUKI Y,et al.Speech enhancement using spectral subtraction with wavelet transform.Electronics&Communications in Japan,1998,81(1):24-31.
[18]ZHENG Rongcai,PENG Jun,WU Chaorong.Grade division of base-level cycles of terrigenous basin and its implications.Acta Sedimentologica Sinica,2001,19(2):249-255.
[19]ZHANG Fan,WEN Yingchu,QIANG Zitong.Upward shallowing depositional sequence of carbonate rock of Xixiangchi Group in Sichuan Basin.Bulletin of Mineralogy,Petrology and Geochemistry,1999,18(1):23-27.
[20]PU Xinchun,ZHOU Haoda,WANG Xilin,et al.Cambrian lithofaeies paleogeography and mineralization in south China.Beijing:Geological Publishing House,1994.
[21]LIU Baojun,XU Xiaosong.Atlas of lithofacies and paleogeography in South China:Sinian-Triassic.Beijing:Science Press,1994.
[22]LI Tiansheng.Sedimentary and diagenetic characteristics and reservoir properties of oil and gas of the Cambrian in Sichuan Basin.Journal of Mineralogy and Petrology,1992,12(3):66-73.
[23]LI Yiping,ZHANG Shengyu.Marine carbonate sedimentary facies in Sichuan Basin:Sedimentary facies and oil and gas distribution of petroliferous basin.Beijing:Petroleum Industry Press,1989.
[24]ZHANG Manlang,XIE Zengye,LI Xizhe,et al.Characteristics of lithofacies paleogeography of Cambrian in Sichuan Basin.Acta Sedimentologica Sinica,2010,28(1):128-139.
[25]LI Jiao,HE Dengfa.Pa1aeogeography and tectonic depositional environment evolution of the Cambrian in Sichuan Basin and adjacent areas.Journal of Palaeogeography,2014,16(4):441-460.
[26]ZHAO Wenzhi,HU Suyun,WANG Zecheng,et al.Petroleum geological conditions and exploration importance of Proterozoic to Cambrian in China.Petroleum Exploration and Development,2018,45(1):1-13.
[27]OSLEGER D A,READ J F.Realizing depositional constraints and processes.Journal of Sedimentary Petrology,1991,61(7):1225-1252.
[28]READ J F.Carbonate platform facies models.AAPG Bulletin,1985,69(1):1-21.
[29]LIU Baojun.Sedimentology.Beijing:Geological Publishing House,1980.
[30]LI Lei,XIE Jinsong,DENG Hongbin,et al.Study on characteristics and its stratigraphic classification and correlation of Cambrian in Sichuan Basin.Geology and Mineral Resources of South China,2012,28(3):197-202.
[31]XIA Jiwen,LI Ling,LUO Bing,et al.Depositional system analysis of the Cambrian in the southwest of Sichuan Basin.Journal of Southwest Petroleum University,2007,29(4):21-25.
[32]MEN Yupeng,XU Xiaosong,MOU Chuanlong,et al.Sedimentary facies and palaeogeography of the Cambrian evaporates in the middle-upper Yangtze area.Sedimentary Geology and Tethyan Geology,2010,30(3):58-64.
[33]LIN Yaoting.Cambrian bittern sediment characteristic and finding potassium prospect in Sichuan Basin.Journal of Salt Lake Research,2009,17(2):13-20.
[34]MEI Mingxiang.Sequence stratigraphic framework and its palaeogeographic setting for the Loushanguan Group dolostones of Cambrian in upper Yangtze region.Journal of Palaeogeography,2007,9(2):117-132.
[35]ZUO Jingxun,PENG Shanchi,ZHU Xuejian.Carbon isotope composition of Cambrian carbonate rocks in Yangtze Platform,South China and its geological implications.Geochimica,2008,37(2):118-128.
[36]LIU Baojun,YE Hongzhuan,PU Xinchun.Cambrian carbonate gravity flow deposits in Guizhou and Hunan.Oil&Gas Geology,1990,1l(3):235-246.