Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 61-71.doi: 10.12108/yxyqc.20240306

• PETROLEUM EXPLORATION • Previous Articles    

Key factors and favorable exploration directions for oil and gas enrichment in back margin sag of thrust nappe in Lower Yangtze

SHAO Wei, ZHOU Daorong, LI Jianqing, ZHANG Chengcheng, LIU Tao   

  1. Nanjing Center, China Geological Survey, Nanjing 210016, China
  • Received:2023-03-15 Revised:2023-05-15 Published:2024-04-30

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Abstract: Through systematic analysis of structural characteristics, sedimentary environment and hydrocarbon enrichment law, on the basis of newly discovered drilling data, the oil and gas enrichment law and favorable exploration direction of the back margin sag of thrust nappe in northern margin of Lower Yangtze were studied. The result shows that:（1）The oil and gas in the sag is characterized by“three gas and two oil”, namely, shale gas of Permian Dalong Formation and Gufeng Formation, coalbed methane and tight sandstone gas of Longtan Formation, shale oil of Dalong Formation and limestone fracture oil of Triassic Yinkeng Formation.（2）The oil and gas enrichment in the sag, represented by Xuancheng Sag, is controlled by three key factors:The sag is a stable block and the formed oil and gas system has a good preservation environment；The sedimentary environment of Dalong Formation（P3d）and Gufeng Formation（P2g）in this area is a deep-water shelf environment, which is a favorable sedimentary facies zone, with two sets of organic matter rich source rock series developed；The effective sealing conditions of the top and bottom are good, with the upper part of the source rocks covered byTriassic marl formation, and the lower part being of bioclastic limestone of Qixia Formation, controlling the longitudinal oil and gas escape.（3）The Lower Triassic to Upper Permian strata in the study area are enriched in marl fracture oil, shale oil, shale gas, coalbed methane and tight sandstone gas from top to bottom, showing the characteristics of“upper oil and lower gas”multiple unconventional oil and gas coexisting together, forming a special oil and gas enrichment pattern.（4）Xuancheng sag has similar geological conditions to Nanling sag, Jurong sag and Changzhou sag, making it the preferred favorable area for next shale oil and gas exploration.

Key words: thrust nappe, ternary enrichment model, shale oil and gas, coalbed methane, tight sandstone gas, hydrocarbon enrichment factors, unconventional oil and gas, Permian, northern margin of Lower Yangtze

CLC Number: 

  • TE122.2
[1] 邹才能,赵群,丛连铸,等. 中国页岩气开发进展、潜力及前景[J]. 天然气工业,2021,41(1):1-14. ZOU Caineng,ZHAO Qun,CONG Lianzhu,et al. Development progress,potential and prospect of shale gas in China[J]. Natural Gas Industry,2021,41(1):1-14.
[2] 霍凤斌,张涛,徐发,等."两层·六端元"页岩评价方法在下扬子地区的应用[J]. 岩性油气藏,2013,25(3):87-91. HUO Fengbin,ZHANG Tao,XU Fa,et al. Application of"two layer and six terminal element"shale evaluation method in Lower Yangtze area[J]. Lithologic Reservoirs,2013,25(3):87-91.
[3] 花彩霞. 下扬子句容地区海相上组合油气地质条件评价[J]. 地质学刊,2014,38(2):200-205. HUA Caixia. Evaluation on oil and gas geological conditions of upper marine formation assemblage in Jurong area of Lower Yangtze area[J]. Journal of Geology,2014,38(2):200-205.
[4] 石刚,徐振宇,郑红军,等. 下扬子地区"三气一油"钻探发现及成藏地质条件:以皖南港地1井钻探发现为例[J]. 地质通报,2019,38(9):1564-1570. SHI Gang,XU Zhenyu,ZHENG Hongjun,et al."Three-GasOne-Oil"drilling findings and reservoir formation geological conditions in the Lower Yangtze area:Exemplified by Gang Di 1 well in south Anhui[J]. Geological Bulletin of China,2019, 38(9):1564-1570.
[5] 潘继平,乔德武,李世臻,等. 下扬子地区古生界页岩气地质条件与勘探前景[J]. 地质通报,2011,30(2):337-343. PAN Jiping,QIAO Dewu,LI Shizhen,et al. Shale-gas geological conditions and exploration prospect of the Paleozoic marine strata in Lower Yangtze area[J]. Geological Bulletin of China, 2011,30(2):337-343.
[6] 朱光,徐嘉炜,刘国生,等. 下扬子地区前陆变形构造格局及其动力学机制[J]. 中国区域地质,1999,18(1):74-80. ZHU Guang,XU Jiawei,LIU Guosheng,et al. Tectonic pattern and dynamic mechanism of the foreland deformation in the Lower Yangtze region[J]. Regional Geology of China,1999,18(1):74-80.
[7] 李海滨,贾东,武龙,等. 下扬子地区中-新生代的挤压变形与伸展改造及其油气勘探意义[J]. 岩石学报,2011,27(3):770-778. LI Haibin,JIA Dong,WU Long,et al. The Mesozoic-Cenozoic compressional deformation,extensional modification and their significance for hydrocarbon exploration in Lower Yangtze region[J]. Acta Petrologica Sinica,2011,27(3):770-778.
[8] 姚柏平,陆红,郭念发. 论下扬子地区多期构造格局叠加及其油气地质意义[J]. 石油勘探与开发,1999,26(4):10-13. YAO Baiping,LU Hong,GUO Nianfa. The multil stage structure frame of Lower Yangtze basin evolution and its significance in petroleum geology[J]. Petroleum Exploration and Development,1999,26(4):10-13.
[9] 梅廉夫,戴少武,沈传波,等. 中、下扬子区中、新生代陆内对冲带的形成及解体[J].地质科技情报,2008,27(4):7-14. MEI Lianfu,DAI Shaowu,SHEN Chuanbo,et al. Formation and disintegration of Mesozoic-Cenozoic intra-continental ramp zone in Middle and Lower Yangtze region[J]. Geological Science and Technology Information,2008,27(4):7-14.
[10] 石刚,李建青,廖圣兵,等. 安徽宣城地区皖油地1井钻获二叠系页岩气[J]. 中国地质,2021,48(2):669-670. SHI Gang,LI Jianqing,LIAO Shengbing,et al. Discovery of Permian shale gas in the Wanyoudi-1 well of Xuancheng,Anhui Province[J]. Geology in China,2021,48(2):669-670.
[11] 谭元隆,王宗秀,冯兴强,等. 复杂构造区油气构造保存条件分析:来自皖泾地1井的构造解析[J]. 地质力学学报,2021, 27(3):441-452. TAN Yuanlong,WANG Zongxiu,FENG Xingqiang,et al. Structural preservation conditions analysis of oil and gas in complex structural area:A case study of structural analysis in the well Wanjingdi-1,Anhui,China[J]. Journal of Geomechanics,2021,27(3):441-452.
[12] 李文强,郭兴伟,王艳忠,等.基于海陆对比建立苏北-南黄海盆地晚二叠世-早三叠世地层格架[J].吉林大学学报(地球科学版),2020,50(1):18-30. LI Wenqiang,GUO Xingwei,WANG Yanzhong,et al. Establishment of stratigraphic framework of Late Permian to Early Triassic in northern Jiangsu and south Yellow Sea Basin based on land-sea Comparison[J]. Journal of Jilin University(Earth Science Edition),2020,50(1):18-30.
[13] 张涛,尹宏伟,贾东,等. 下扬子区构造变形特征与页岩气保存条件[J]. 煤炭学报,2013,38(5):883-889. ZHANG Tao,YIN Hongwei,JIA Dong,et al. Structural deformation characteristics and shale gas preservation of Lower Yangtze region[J]. Journal of China Coal Society,2013,38(5):883-889.
[14] 张鹏辉,梁杰,陈建文,等. 中国叠合盆地深部海相地层油气保存条件剖析[J]. 海洋地质前沿,2019,35(1):1-11. ZHANG Penghui,LIANG Jie,CHEN Jianwen,et al. Hydrocarbon preservation analysis for marine strata in superimposed basins of China[J]. Marine Geology Frontiers,2019,35(1):1-11.
[15] 吴林,陈清华,庞飞,等. 下扬子地区中新生代构造变形单元及构造变形样式[J]. 吉林大学学报(地球科学版),2015,45(6):1722-1734. WU Lin,CHEN Qinghua,PANG Fei,et al. Mesozoic-Cenozoic tectonic deformation units and styles in Lower Yangtze region[J]. Journal of Jilin University(Earth Science Edition),2015, 45(6):1722-1734.
[16] 吕庆田,刘振东,董树文,等."长江深断裂带"的构造性质:深地震反射证据[J]. 地球物理学报,2015,58(12):4344-4359. LYU Qingtian,LIU Zhendong,DONG Shuwen,et al. The nature of Yangtze River deep fault zone:Evidence from deep seismic data[J]. Chinese Journal of Geophysics,2015,58(12):4344-4359.
[17] 解东宁,何明喜,周立发,等. 东秦岭-大别造山带北缘逆冲推覆构造特征及油气前景[J].石油与天然气地质,2006,27(1):48-55. XIE Dongning,HE Mingxi,ZHOU Lifa,et al. Characteristics of overthurst structures on northern edge of east Qinling-Dabie orogenic belt and hydrocarbon potentials[J]. Oil & Gas Geology,2006,27(1):48-55.
[18] 佘晓宇,徐宏节,何治亮. 江苏下扬子区中、古生界构造特征及其演化[J].石油与天然气地质,2004,25(2):226-230. SHE Xiaoyu,XU Hongjie,HE Zhiliang. Tectonic characteristics and evolution of Mesozoic and Paleozoic in Lower Yangtze region,Jiangsu[J]. Oil & Gas Geology,2004,25(2):226-230.
[19] 蔡周荣,夏斌,黄强太,等. 上、下扬子区古生界页岩气形成和保存的构造背景对比分析[J]. 天然气地球科学,2015,26(8):1446-1454. CAI Zhourong,XIA Bin,HUANG Qiangtai,et al. Comparative study of the tectonic setting on the formation and preservation of Paleozoic shale gas between the Upper Yangtze and the Lower Yangtze platforms[J]. Natural Gas Geoscience,2015,26(8):1446-1454.
[20] LYU Qingtian,SHI Danian,LIU Zhendong,et al. Crustal structure and geodynamics of the Middle and Lower reaches of Yangtze metallogenic belt and neighboring areas:Insights from deep seismic reflection profiling[J]. Journal of Asian Earth Sciences,2015,114:704-716.
[21] 丁燕云,李占奎. 基于航磁信息分析下扬子区及华南区基底性质[J]. 物探与化探,2009,33(5):493-496. DING Yanyun,LI Zhankui. An analysis of basement properties of Lower Yangtze area and South China area based on aeromagnetic information[J]. Geophysical & Geochemical Exploration, 2009,33(5):493-496.
[22] 阴钰毅,姚志纯,郭小波,等. 鄂尔多斯盆地西缘二叠系隐伏构造特征及勘探意义[J]. 岩性油气藏,2022,34(4):79-88. YIN Yuyi,YAO Zhichun,GUO Xiaobo,et al. Characteristics of Permian concealed structures in western margin of Ordos Basin and its significance for oil and gas exploration[J]. Lithologic Reservoirs,2022,34(4):79-88.
[23] 姜波.下扬子地区推覆构造特征及演化[J]. 中国矿业大学学报,1992,21(1):43-50. JIANG Bo. Characteristics and evolution of nappe structures in Lower Yangtze River area[J]. Journal of China University of Mining & Technology,1992,21(1):43-50.
[24] 徐曦,朱晓颖,单希鹏,等. 下扬子区中新生代沿江盆地群的盆地结构与沉积特征[J]. 石油实验地质,2018,40(3):303-314. XU Xi,ZHU Xiaoying,SHAN Xipeng,et al. Structure and sedimentary characteristics of the Meso-Cenozoic basin group along the Yangtze River in the Lower Yangtze region[J]. Petroleum Geology & Experiment,2018,40(3):303-314.
[25] 王鹏程,李三忠,刘鑫,等. 长江中下游燕山期逆冲推覆构造及成因机制[J]. 岩石学报,2012,28(10):3418-3430. WANG Pengcheng,LI Sanzhong,LIU Xin,et al. Yanshanian fold-thrust tectonics and dynamics in the Middle-Lower Yangtze River area,China[J]. Acta Petrologica Sinica,2012,28(10):3418-3430.
[26] 郭念发,赵红格,陈红,等. 下扬子地区海相地层油气赋存条件分析及选区评价[J]. 西北大学学报(自然科学版),2002, 32(5):526-530. GUO Nianfa,ZHAO Hongge,CHEN Hong,et al. Oil-gas occurrence conditions and evaluation of chosen belts of the marine strata in Yangtze area[J]. Journal of Northwest University (Natural Science Edition),2002,32(5):526-530.
[27] 马永生,陈洪德,王国力,等. 中国南方层序地层与古地理[M]. 北京:科学出版社,2009. MA Yongsheng,CHEN Hongde,WANG Guoli,et al. Sequence stratigraphy and paleogeography in south China[M]. Beijing:Science Press,2009.
[28] 徐曦,杨风丽,赵文芳. 下扬子区海相中、古生界上油气成藏组合特征分析[J]. 海洋石油,2011,31(4):48-53. XU Xi,YANG Fengli,ZHAO Wenfang. Analysis of characteristics of upper hydrocarbon play of Mesozoic-Paleozoic marine group,Lower Yangtze region[J]. Offshore Oil,2011,31(4):48- 53.
[29] 姚素平,吴聿元,余文端,等. 下扬子区孤峰组-大隆组露头剖面特征与岩相变化[J]. 油气藏评价与开发,2022,12(1):215-232. YAO Suping,WU Yuyuan,YU Wenduan,et al. Outcrop characteristic and lithofacies changes of both Gufeng and Dalong formations in Lower Yangtze region[J]. Petroleum Reservoir Evaluation and Development,2022,12(1):215-232.
[30] 李红敬,林正良,解习农. 下扬子地区古生界硅岩地球化学特征及成因[J]. 岩性油气藏,2015,27(5):232-239. LI Hongjing,LIN Zhengliang,XIE Xinong. Geochemical characteristics and origin of Palaeozoic siliceous rocks in Lower Yangtze area[J]. Lithologic Reservoirs,2015,27(5):232-239.
[31] 丁江辉,张金川,石刚,等. 皖南地区上二叠统大隆组页岩沉积环境与有机质富集机理[J]. 石油与天然气地质,2021,42(1):158-172. DING Jianghui,ZHANG Jinchuan,SHI Gang,et al. Sedimentary environment and organic matter enrichment mechanisms of the Upper Permian Dalong Formation shale,southern Anhui Province,China[J]. Oil & Gas Geology,2021,42(1):158-172.
[32] 周冰,金之钧,刘全有,等.苏北盆地黄桥地区富CO2流体对油气储-盖系统的改造作用[J].石油与天然气地质,2020,41(6):1151-1161. ZHOU Bing,JIN Zhijun,LIU Quanyou,et al. Alteration of reservoir-caprock systems by using CO2-rich fluid in the Huangqiao area,north Jiangsu Basin[J]. Oil & Gas Geology, 2020,41(6):1151-1161.
[33] 潘文蕾,彭金宁,翟常博,等. 苏北盆地海相地层残存状况及成藏类型分析[J]. 石油实验地质,2022,44(2):231-240. PAN Wenlei,PENG Jinning,ZHAI Changbo,et al. Residual strata and hydrocarbon accumulation model of marine sediments in Subei Basin[J]. Petroleum Geology & Experiment, 2022,44(2):231-240.
[34] 陈洪德,倪新锋,刘文均,等. 中国南方盆地覆盖类型及油气成藏[J]. 石油学报,2008,29(3):317-323. CHEN Hongde,NI Xinfeng,LIU Wenjun,et al. Overlay relationship of basins and hydrocarbon accumulation in South China[J]. Acta Petrolei Sinica,2008,29(3):317-323.
[35] 张涛,尹宏伟,贾东,等. 下扬子区构造变形特征与页岩气保存条件[J]. 煤炭学报,2013,38(5):883-889. ZHANG Tao,YIN Hongwei,JIA Dong,et al. Structural deformation characteristics and shale gas preservation of Lower Yangtze region[J]. Journal of China Coal Society,2013,38(5):883- 889.
[36] 姜培海,张政,唐衔,等. 非常规油气聚集主控因素及油气富集综合分析[J]. 非常规油气,2017,4(3):110-118. JIANG Peihai,ZHANG Zheng,TANG Xian,et al. Comprehensive analysis for hydrocarbon accumulation main control factors and enrichment of unconventional oil and gas[J]. Unconventional Oil & Gas,2017,4(3):110-118.
[37] 李建青,章诚诚,黄正清,等. 下扬子复杂构造区超高压含气层的发现及油气富集关键要素[J]. 地质通报,2021,40(4):577-585. LI Jianqing,ZHANG Chengcheng,HUANG Zhengqing,et al. Discovery of overpressure gas reservoirs in the complex structural area of the Lower Yangtze and its key elements of hydrocarbon enrichment[J]. Geological Bulletin of China,2021,40(4):577-585.
[38] 吴通,李建青,章诚诚,等. 下扬子无为凹陷中三叠世周冲村组天然气成藏物质基础分析[J]. 华东地质,2020,41(4):425-433. WU Tong,LI Jianqing,ZHANG Chengcheng,et al. Analysis on the gas reservoir forming conditions of Middle Triassic Zhouchongcun Formation in Wuwei Depression,Lower Yangtze Basin[J]. East China Geology,2020,41(4):425-433.
[39] 刘桃,吴通,方朝刚,等. 下扬子地区无为凹陷三叠系气藏超压特征及其成因分析[J]. 华东地质,2023,44(4):415-423. LIU Tao,WU Tong,FANG Chaogang,et al. Overpressure characteristics and genesis of the Triassic gas reservoirs in Wuwei Depression of Lower Yangtze Region[J]. East China Geology, 2023,44(4):415-423.
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