Distribution and exploration direction of medium-and large-sized marine carbonate gas fields in Sichuan Basin, SW China
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摘要
Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and their control on key hydrocarbon accumulation factors, the distribution law of medium-and large-sized marine carbonate gas fields in the basin was examined and the exploration direction was pointed out. Through the analysis of the periodic stretching-uplifting background, it is concluded that five large scale paleo-rifts, three large scale paleo-uplifts, five large scale paleo erosion surfaces were formed in the marine craton stage of Sichuan Basin, and these geological units control the key reservoir forming factors of medium and large sized gas fields:(1) Large-scale paleo-rifts control the distribution of high-quality hydrocarbon generation centers.(2) The margin of large-scale paleo-rifts, high position of paleo-uplifts and paleo erosion surfaces control the distribution of high-quality reservoirs.(3) Large-scale paleo-rifts, paleo-uplifts, paleo erosion surfaces and present tectonic setting jointly control the formation of many types of large and medium-sized traps.(4) Natural gas accumulation is controlled by the inheritance evolution of traps in large geological units. Based on the comparative analysis of the distribution characteristics of medium-and large-sized gas fields and large geological units, it is proposed that the superimposition relationship between single or multiple geological units and the present structure controls the distribution of medium-and large-sized gas fields, and the "three paleo" superimposed area is the most advantageous. According to the above rules, the main exploration fields and directions of medium-and large-sized marine carbonate gas fields in Sichuan Basin include periphery of Deyang-Anyue paleo-rift, eastern margin of Longmenshan paleo-rift, margins of Kaijiang-Liangping oceanic trough and Chengkou-western Hubei oceanic trough, the high part of the subaqueous paleo-uplifts around Central Sichuan, paleo erosion surfaces of the top boundary of Maokou Formation in eastern and southern Sichuan Basin, paleo erosion surfaces of the top boundary of the Leikoupo Formation in central and western Sichuan Basin.
Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and their control on key hydrocarbon accumulation factors, the distribution law of medium-and large-sized marine carbonate gas fields in the basin was examined and the exploration direction was pointed out. Through the analysis of the periodic stretching-uplifting background, it is concluded that five large scale paleo-rifts, three large scale paleo-uplifts, five large scale paleo erosion surfaces were formed in the marine craton stage of Sichuan Basin, and these geological units control the key reservoir forming factors of medium and large sized gas fields:(1) Large-scale paleo-rifts control the distribution of high-quality hydrocarbon generation centers.(2) The margin of large-scale paleo-rifts, high position of paleo-uplifts and paleo erosion surfaces control the distribution of high-quality reservoirs.(3) Large-scale paleo-rifts, paleo-uplifts, paleo erosion surfaces and present tectonic setting jointly control the formation of many types of large and medium-sized traps.(4) Natural gas accumulation is controlled by the inheritance evolution of traps in large geological units. Based on the comparative analysis of the distribution characteristics of medium-and large-sized gas fields and large geological units, it is proposed that the superimposition relationship between single or multiple geological units and the present structure controls the distribution of medium-and large-sized gas fields, and the "three paleo" superimposed area is the most advantageous. According to the above rules, the main exploration fields and directions of medium-and large-sized marine carbonate gas fields in Sichuan Basin include periphery of Deyang-Anyue paleo-rift, eastern margin of Longmenshan paleo-rift, margins of Kaijiang-Liangping oceanic trough and Chengkou-western Hubei oceanic trough, the high part of the subaqueous paleo-uplifts around Central Sichuan, paleo erosion surfaces of the top boundary of Maokou Formation in eastern and southern Sichuan Basin, paleo erosion surfaces of the top boundary of the Leikoupo Formation in central and western Sichuan Basin.
Based on the analysis of the basic characteristics of medium-and large-sized marine gas fields in Sichuan Basin, combined with the division of major reservoir forming geological units in the marine craton stage and their control on key hydrocarbon accumulation factors, the distribution law of medium-and large-sized marine carbonate gas fields in the basin was examined and the exploration direction was pointed out. Through the analysis of the periodic stretching-uplifting background, it is concluded that five large scale paleo-rifts, three large scale paleo-uplifts, five large scale paleo erosion surfaces were formed in the marine craton stage of Sichuan Basin, and these geological units control the key reservoir forming factors of medium and large sized gas fields:(1) Large-scale paleo-rifts control the distribution of high-quality hydrocarbon generation centers.(2) The margin of large-scale paleo-rifts, high position of paleo-uplifts and paleo erosion surfaces control the distribution of high-quality reservoirs.(3) Large-scale paleo-rifts, paleo-uplifts, paleo erosion surfaces and present tectonic setting jointly control the formation of many types of large and medium-sized traps.(4) Natural gas accumulation is controlled by the inheritance evolution of traps in large geological units. Based on the comparative analysis of the distribution characteristics of medium-and large-sized gas fields and large geological units, it is proposed that the superimposition relationship between single or multiple geological units and the present structure controls the distribution of medium-and large-sized gas fields, and the "three paleo" superimposed area is the most advantageous. According to the above rules, the main exploration fields and directions of medium-and large-sized marine carbonate gas fields in Sichuan Basin include periphery of Deyang-Anyue paleo-rift, eastern margin of Longmenshan paleo-rift, margins of Kaijiang-Liangping oceanic trough and Chengkou-western Hubei oceanic trough, the high part of the subaqueous paleo-uplifts around Central Sichuan, paleo erosion surfaces of the top boundary of Maokou Formation in eastern and southern Sichuan Basin, paleo erosion surfaces of the top boundary of the Leikoupo Formation in central and western Sichuan Basin.
引文
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[12]ZHAO Wenzhi,WANG Zecheng,HU Suyun,et al.Largescale hydrocarbon accumulation factors and characteristics of marine carbonate reservoirs in three large onshore cratonic basins in China.Acta Petrolei Sinica,2012,33(S2):1-9.
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[22]WEI Guoqi,YANG Wei,DU Jinhu,et al.Geological characteristic of the Sinian-Early Cambrian intracratonic rift,Sichuan Basin.Natural Gas Industry,2015,35(1):24-35.
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[28]YANG Yueming,WEN Long,LUO Bing,et al.Hydrocarbon accumulation of Sinian natural gas reservoirs,LeshanLongnvsi paleohigh,Sichuan Basin,SW China.Petroleum Exploration and Development,2016,43(2):179-188.
[29]HE Tianhua.Exploration of oil and gas formation in the hercynian formation,indosinian-Himalayan reformation of Sichuan basin.Natural Gas Industry,1981(2):4-14.
[30]WANG Yigang,WEN Yingchu,HONG Haitao,et al.Dalong Formation found in Kaijiang-Liangping Ocenic trough in the Sichuan Basin.Natural Gas Industry,2006,26(9):32-36.
[31]WANG Yigang,WEN Yingchu,ZHANG Fan,et al.Distribution law of the organic reefs in Changxing Formation of Upper Permian in east Sichuan.Natural Gas Industry,1998,18(6):10-15.
[32]GAO Ruiqi,ZHAO Zhengzhang.The frontier petroleum exploration in China:Prospect of marine petroleum geology and exploration in south China(Vol.5).Beijing:Petroleum Industry Press,2001.
[33]XIA Maolong,WEN Long,WANG Yigang,et al.High-quality source rocks in trough facies of Upper Permian Dalong Formation of Sichuan Basin.Petroleum Exploration and Development,2010,37(6):654-662.
[34]ZHAO W Z,LUO P,CHEN G S,et al.Origin and reservoir rock charateristics of dolostones in the Early Triassic Feixianguan Formation,NE Sichuan Basin,China:Significance for futurs gas exploration.Journal of Petroleum Geology,2005,28(1):83-100.
[35]LUO Ping,SU Liping,LUO Zhong,et al.Application of laser microsampling technique to analysis of C and O isotopes of oolitic dolomites in Feixianguan Formation,Northeast Sichuan.Geochimica,2006,35(3):325-330.
[36]ZENG Wei,HUANG Xianping,YANG Yu,et al.The origin and distribution of dolostone in Feixianguan Formation in Lower Triassic Series,Northeast Sichuan.Journal of Southwest Petroleum University,2007,29(1):19-22.
[37]ZOU Caineng,XU Chunchun,WANG Zecheng,et al.Geological characteristics and forming conditions of the large platform margin reef-shoal gas province in the Sichuan Basin.Petroleum Exploration and Development,2011,38(6):641-651.
[38]WEN Long,YANG Yueming,YOU Chuanqiang,et al.Characteristics of Dengying Fm sedimentary sequence in the central-western Sichuan Basin and their controlling effect on gas accumulation.Natural Gas Industry,2016,36(7):8-17.
[39]ZHENG Rongcai,ZHANG Shaonan,LI Demin.Origin and researching significance of breccias in the Upper Carboniferous Huanglong Formation,eastern Sichuan.Journal of Chengdu University of Technology,1996,23(1):8-18.
[40]ZHENG Rongcai,LI Demin.A study on sequence stratigraphy of the Huanglong Formation,Upper Carboniferous in eastern Sichuan.Acta Sedimentologica Sinica,1995,13(S1):1-9.
[41]DAI Jinxing.Gas in Yang-Xin Formation in Sichuan province is originated from coal containing formation:A discussion on this problem with Mr.Huang et al.Petroleum Exploration and Development,1983,10(4):69-75.
[42]ZONG Jian.On the hydrogeological significance of karst development in ancient denudation surface.Coal Geology and Exploration,1987(6):41-45.
[43]Petroleum Geology Writing Group in Sichuan Oil and Gas Region.Petroleum geology of China(Vol.10):Sichuan oil and gas region.Beijing:Petroleum Industry Press,1997:55-80.
[44]MA Yongsheng,CAI Xunyu,GUO Xusheng,et al.The discovery of Puguang Gas Field.Engineering Science,2010,12(10):14-23.
[45]RAN Longhui,CHEN Gengsheng,XU Renfen.Discovery and exploration of Luojiazhai Gas Field,Sichuan Basin.Marine Origin Petroleum Geology,2005,10(1):46-50.
[46]ZENG Yunxian,LIU Wei,LI Xining.Research on structural-evolution and oil/gas reservoiring of Feixianguan Formation in northwest Sichuan basin.Natural Gas Industry,2005,25(S1):21-23.
[47]HUANG Fuxi,YANG Tao,YAN Weipeng,et al.Comparison and analysis of reef-bank gas reservoirs in Longgang and Yuanba Areas in Sichuan Basin.China Petroleum Exploration,2014,19(3):12-20.
[48]ZOU Juan,YANG Xun,YIN Hong,et al.Characteristics of bioreef and shoal reservoirs in Changxing and Feixianguan Formations of Jiulongshan-Jiange area and their controlling factors.Natural Gas Exploration and Development,2014,37(4):1-6.
[49]GUO Xusheng,GUO Tonglou,HUANG Renchun,et al.Cases of discovery and exploration of marine fields in China(Part16):Yuanba Gas Field in Sichuan Basin.Marine Origin Petroleum Geology,2014,19(4):57-64.
[50]CHEN Zongqing.Forecast,classification and assesment for gas reservoirs of Carboniferous stratigraphic structural Combination traps in eastern Sichuan.Acta Petrolei Sinica,2000,21(3):25-30.
[51]ZHAO Wenzhi,WANG Zhaoyun,ZHANG Shuichang,et al.Oil cracking:An important way for highly efficient generation of gas from marine source rock kithchen.Chinese Science Bulletin,2006,51(5):589-595.
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