CHARACTERISTICS OF THE FRACTURES IN YANGKOU AREA, RUDONG, JIANGSU PROVINCE AND ITS IMPLICATION
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摘要: 结合已有地热钻孔采用多种物探方法研究了江苏如东洋口地区断裂的空间展布特征。研究结果表明，洋口地区分布3组断裂，分别为隶属滨海断裂的北西向雁行型次级断裂、近东西向栟茶河断裂及海安-河口断裂。北西向雁行型次级断裂为4条，主要分布于洋口地区北段及老坝港地区，断裂陡倾，倾向北东，倾角70°-80°，推测切穿至新近系。栟茶河断裂由3条次级断裂组成，主要分布于洋口地区中段，断裂走向近东西，倾向北，整体呈曲折状延伸，倾角60°-80°。结合以往地震地质特征以及地热钻孔资料，认为栟茶河断裂为活动性断裂，切穿了第四纪全新世地层，全新世地层断距较小。断裂的活动性影响如东洋口经济开发区的建设与发展。海安-河口断裂自海安延伸至洋口地区南段，走向近东西，倾向南，倾角约为70°，切穿古近纪地层。洋口地区断裂的分布与该地区地热资源分布具有良好的对应关系，其对于该地区地热资源开发具有良好的指导意义。Abstract: Fracture characteristics in Rudong Yangkou area, Jiangsu province have been studied through various geophysical methods combined with geothermal drilling data in this paper. Results indicate that there are three fault systems in Yangkou area, including a NW-trending secondary fault system of Binhai fault, EW-trending Benchahe fault system and Haian-Hekou fault. The NW-trending secondary fault system contains four secondary faults, mainly distributed in the north of Yangkou area and Laobagang area. The faults are steeply NE-dipping, with dip angles range from 70° to 80°, and speculatively cut through the Neogene strata. The EW-trending Benchahe fault system contains three secondary faults, mainly distributed in the middle of Yangkou area. The faults are mainly north dipping, with dip angles range from 60° to 80°. Combined with previous seismogeological and geothermal data in Yangkou area, it is comprehensively speculated that Benchahe fault is active, which makes the Quaternary Holocene strata being cut off with minor displacement. The activity of Benchahe fault influences the safety in the construction and development of Yangkou Economic area. The EW-trending Haian-Hekou fault is south dipping with the dip angle about 70°, extending from haian to the south of Yangkou area and cut off the Paleogene strata. There is compatible corresponding relation between distribution characteristics of faults and geothermal resources in Yangkou area, which is of certain guiding significance for the geothermal resources exploitation in this region.
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Key words:
- fracture characteristics /
- binhai fault /
- benchahe fault /
- geothermal resource /
- Yangkou area
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2008年正值千载难逢的国际极地年和国际行星地球年的重合, 北欧国家作为北极地质的主人, 主办第33届国际地质大会, 因此将极地地质和北极油气作为重要的议题, 并占据了区域专题研讨的首要。
极地的科学分组会一共有12个。它们是显生宙北极地区的古地理和大地构造演化, 北极石油区, 巴伦支海石油地学, 俄罗斯北极盆地石油地学, 北美和格陵兰盆地石油地学, 俄罗斯—挪威在巴伦支海的科学合作(主要涉及油气勘探), 正在变暖星球的永久冻土, 北极的古气候及其极端环境, 北极地区的金属矿床成因, 南极的地球动力演化和古地理, 新生代的南极冰川历史, 末次冰盛期以来北极和南极的冰川消退记录与愈千年的新生代双极联系。
由于2007年8月2日俄罗斯北极点的插旗事件, 北极地区的油气资源潜力成为国际关注的焦点。本次国际地质大会也是非常令人瞩目。2008年7月23日美国地质调查局时隔8年后, 再次公布了北极油气资源评价结果。大会的两个长报告分别介绍了美国地质调查局的北极油气能源调查结果和评价方法。美国地质调查局的大会展台也在突出位置介绍这一结果。根据美国地质调查局的最新评估, 在北极圈以北的33个地质区中, 25个地质区给出了评价结果, 待发现估计总量为石油900亿桶, 占世界待发现的石油资源量的13 %, 天然气1669立方英尺, 占世界待发现天然气资源量的30 %。北极地区的油气能源潜力十分巨大。(附照片两张)
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图 3 L1—L3线布格重力异常曲线
Figure 3. Bouguer gravity anomaly curves along L1, L2 and L3 Lines in Yangkou area
图 4 B4反演电阻率推断解释剖面
Figure 4. Inversion resistivity and geological interpretation of Line B4
图 5 B1—B3反演电阻率推断解释剖面
Figure 5. Inversion resistivity and geological interpretation of B1, B2 and B3 profiles
表 1 地层密度分层表
Table 1. Hierarchical table of formation density in Yangkou area
密度层 平均密度值/(103 kg·m-3) 地质属性 第一密度层 1.99 第四系 第二密度层 2.28 新近系、古近系 第三密度层 2.58 白垩系、侏罗系及中、上三叠统 第四密度层 2.71 下三叠统—中元古界 
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