MULTI-LEVEL GEOLOGICAL MAPPING APPROACHES OF THE PLANE AREA AND APPLICATIONS: A CASE STUDY IN 1: 50000 SHEETS OF GANGKOU, TAIXIAN, ZHANGDIANGONGSHE, TAIXINGXIAN AND SHENGCITANGZHEN
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摘要: 以江苏港口、泰县、张甸公社、泰兴县、生祠堂镇幅平原区1：50000填图试点为例，围绕深覆盖平原区1：50000基础地质填图的不同深度层次目标任务，采取多种有效技术方法组合，分别对浅表（0~4 m）沉积物、第四纪以来松散层、以及基岩地质等3个深度层次的有效地质填图技术方法进行研究。浅表采用槽型钻+DEM+RS的综合填图方法，第四纪以来松散层采用钻孔、综合地球物理测井相结合的方法建立地层格架，基底地质特征通过区域重磁资料结合浅层地震勘查研究，有效填绘各层次地质信息。基于多种信息源，建立了不同深度、不同精度的多尺度三维地质模型，通过三维建模客观表达多层次地质结构特征，丰富了平原区1：50000填图成果图件体系。最后，探索了不同层次填图成果的应用领域，为平原区1：50000填图的地质图件表达及成果应用提供示范。Abstract: To take geological survey of 1:50000 sheets of Gangkou, Taixian, Zhangdiangongshe, Taixingxian and Shengcitangzhen for an example, geological mapping technologies for three depth levels of shallow (0 to 4 m), Quaternary and bedrock depth have been discussed in this paper. Different combination of effective mapping methods should be selected to determine different mapping targets of different depths. Shallow deposits are mapped by the methods of groove drilling, DEM analyzing and RS (remote sensing) image interpretation. The stratigraphic framework of Quaternary deposits is established by combination of drilling and integrated geophysical logging. The bedrock geological characteristics are studied according to the regional magnetic data combined with the shallow seismic exploration method. These geological methods could obtain geological information effectively. The multi-scale three-dimensional geological models of different depth and precision are established based on a variety of geological information. The multi-level geological structure characteristics are presented by three-dimensional modeling, which enriches 1:50000 geological mapping results. Finally, the applications of different level mapping results are discussed, leading the way of expression and application of 1:50000 geological mapping results in plane area.
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Key words:
- plane area /
- 1:50000 mapping /
- 3D geological structure /
- results application
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图 2 深覆盖平原区1:50000填图技术路线
Figure 2. Technology roadmap of 1:50000 mapping in the deep-covered plane area
图 3 生祠堂镇幅遥感地貌解译图
Figure 3. Geomorphologic interpretation based on remote sensing image of Shengcitangzhen sheet
图 4 槽型钻揭露长江三角洲浅表典型沉积组合特征(深度单位:m)
Figure 4. Typical sedimentary assemblages exposed by groove drill in the Yangtze delta
图 5 生祠堂镇幅浅表地质图
Figure 5. The geologic map of shallow deposits of Shengcitangzhen sheet
图 6 生祠堂幅浅表高精度地质模型建立
Figure 6. The high-precision geological model of shallow deposits of Shengcitangzhen sheet
图 8 里下河沉积区TZK9钻孔综合柱状图
Figure 8. Columnar section of drill TZK9 in the Lixia River area
图 9 溱潼—梁徐—张甸—张桥第四纪地质剖面图
Figure 9. Quaternary geological section of Qintong-Liangxu-Zhangdian-Zhangqiao
图 10 小纪-华港-沈高-南莫第四纪地质剖面图
Figure 10. Quaternary geological section of Xiaoji-Huagang-Shengao-Nanmo
图 11 Q1、Q2、Q3、Q4地质界面起伏以及第四纪以来黏土、中砂的空间分布
Figure 11. Strata interfaces of Q1、Q2、Q3、Q4 and spatial distributions of Quaternary clay and medium sands
图 13 重力-地震联合反演剖面(苏陈镇-生祠堂)
Figure 13. The gravity and seismic inversion profile (Suchenzhen-Shengcitang)
图 14 泰州断裂浅地震剖面解释
Q—第四纪; N1-2yn2—盐城组上段; N1-2yn1—盐城组下段; E2-3s—三垛组
Figure 14. The Taizhou fault revealed by shallow seismic profile
图 15 基底界面起伏三维模型(绿色为新近系底界, 蓝色为新生界底界, 黄色为中生界底界)
Figure 15. 3D model of basement interfaces
表 1 试点图幅第四纪地层简表
Table 1. Quaternary lithostratigraphy of mapping area
年代 里下河沉积区(东台地层小区) 长江三角洲沉积区(南通地层小区) 组名 深度/m 岩性特征 沉积相 组名 深度/m 岩性特征 沉积相 全新世 淤尖组 3~6 灰、灰黄色黏土; 黏土质粉砂 湖沼相
滨岸相如东组 20~50 灰色粉砂与黏土互层, 粉砂 河口砂坝 晚更
新世灌南组 20~40 灰黄、棕黄色黏土; 灰色粉砂与黏土互层 泛滥相
滨岸相滆湖组 35~75 灰色中粗砂、含砾中粗砂; 细砂 河床相
滨岸相昆山组 50~80 灰、青灰、灰黄色粉砂夹黏土、粉砂、细砂 滨岸相 中更
新世小腰庄组 75~95 灰黄、棕黄色黏土为主 泛滥相 启东组 80~110 灰色、灰黄色砂砾层、含砾粗砂、细砂 河床相
边滩相早更
新世五队镇组 190~270 灰、灰绿、灰黄色黏土、含粉砂黏土, 局部夹粉砂、细砂 泛滥相 海门组 200~270 灰、灰黄色粉砂、细砂、中粗砂、含砾中粗砂、砾石层, 局部夹薄层灰黄、灰褐色黏土 河床相 
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