Discovery of the Shallow Gas Source Layer and Late Pleistocene Paleosol in Qidong Area, Southeastern of Jiangsu Province:according to 1∶50000 Yudong Town and other six Rigional Geological maps in Jiangsu Province
Abstract：The field work of the 1∶50,000 regional geological survey on Qidong area, Southeastern Jiangsu has been accepted. Based on the new data,we found that there are brown, celadon, gray-black “hard clay bands” between 46-59 m below the surface in the incised valley area, with thickness ranging from 2 m to 10 m. In the top of the “hard clay bands” in some drilling cores is paleosol which has root-mark structure, calcareous concretions and other exposed soil-forming features; and in the lower part is a grayish black silty clay layer rich in organic and plant debris. The discovery of the paleosol proved that the area is not fully incised valley region in LGM, which updates the understanding on the Late Pleistocene sedimentary strata of the survey area. The silty clay layer rich in organic and plant debris, with thickness of 0.5-2 m,provided gas source to the shallow gas of the study area.
冯文立，季文婷，冯金顺，张平，郭盛乔，程瑜，赵增玉. 江苏启东地区发现浅层天然气气源层与晚更新世末期古土壤层——据江苏1∶5万余东镇等七幅区调[J]. 中国地质调查, 2015, 2(2): 56-60.
FENG Wen-li,JI Wen-ting,FENG Jin-shun,ZHANG Ping,GUO Sheng-qiao,CHEN Yu,ZHAO Zeng-yu. Discovery of the Shallow Gas Source Layer and Late Pleistocene Paleosol in Qidong Area, Southeastern of Jiangsu Province:according to 1∶50000 Yudong Town and other six Rigional Geological maps in Jiangsu Province. , 2015, 2(2): 56-60.
[1] 吴标云,李从先.长江三角洲第四纪地质[M].北京:海洋出版社,1987:24-26. [2] 黄慧珍,唐保根,杨文达,等.长江三角洲沉积地质学[M].北京:地质出版社,1996:239. [3] 李从先,汪品先.晚第四纪长江三角洲地层的研究[M].北京:科学出版社,1998:222. [4] Hori K,Saito Y,Zhao Q,et al.Sedimentary facies of the tide-dominated paleo-Changjiang(Yangtze)estuary during the last transgression[J].Marine Geology,2001,177(3):331-351. [5] Hori K,Saito Y,Zhao Q,et al.Evolution of the coastal depositional systems of the Changjiang (Yangtze) River in response to late Pleistocene-Holocene sea-level changes[J].Journal of Sedimentary Research,2002,72(6):884-897. [6] Zhao B,Wang Z,Chen J,et al.Marine sediment records and relative sea level change during late Pleistocene in the Changjiang delta area and adjacent continental shelf[J].Quaternary International,2008,186(1):164-172. [7] Wang Z,Xu H,Zhan Q,et al.Lithological and palynological evidence of late Quaternary depositional environments in the subaqueous Yangtze delta,China[J].Quaternary Research,2010,73(3):550-562. [8] 江苏省地质矿产局.江苏省及上海市区域地质志[M].北京:地质出版社,1984:5-13. [9]李从先,汪品先.长江晚第四纪河口地层学研究[M].北京:科学出版社,1998:222. [10] 陈吉余,虞志英,恽才兴.长江三角洲的地貌发育[J].地理学报,1959,25(3):201-220. [11]郑光膺.南黄海第四纪层型地层对比[M].北京:科学出版社,1989:362. [12]冯小铭,韩子章,方家骅,等.南通市第四纪沉积特征及沉积相(研究报告)[M]//中国地质科学院南京地质矿产研究所文集.1990:89-90. [13]Liu K,Sun S,Jiang X.Environmental change in the Yangtze River delta since 12,000 years B.P.[J].Quaternary Research,1992,38(1):32-45. [14]郑开富.江苏地区第四系浅层天然气的分布与勘探前景[J].天然气工业,1998:20-24. [15]李从先,闵秋宝,孙和平.长江三角洲南翼全新世地层和海侵[J].科学通报,1986,43(23):2557-2559. [16]陈报章,李从先,业治铮.冰后期长江三角洲北翼沉积及其环境演变[J].海洋学报,1995(1):64-75. [17]王张华,赵宝成,陈静,等.长江三角洲地区晚第四纪年代地层框架及两次海侵问题的初步探讨[J].古地理学报,2008,10:99-110. [18]闵秋宝,汪品先.论上海地区的第四纪海进[J].同济大学学报:自然科学版,1979,(2):109-128. [19]李从先,闵秋宝,孙和平.长江三角洲南翼全新世地层和海侵[J].科学通报,1986,(21):1650-1653. [20]邓兵,吴国瑄,李从先.长江三角洲晚第四纪古土壤的古环境及古气候信息[J].海洋地质与第四纪地质,2003,23(2):1-8. [21]朱永其,李承伊,曾成开,等.关于东海大陆架晚更新世最低海面[J].科学通报,1979,24(7):317-320.
2015, Vol. 2 
