TAILIEUCHUNG - Utilization of seismic refraction data for the study of structure of Bang hot-water source, Le Thuy, Quang Binh
Study of the geological structural elements in the area of geothermal sources is important for identifying the geothermal reservoir, the object is capable of energy production. This paper presents the preliminary results of the structural study obtained by the seismic refraction data in the area of hot water spring Bang, Le Thuy, Quang Binh. | Vietnam Journal of Earth Sciences, 38(4), 393-408, DOI: Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Utilization of seismic refraction data for the study of structure of Bang hot-water source, Le Thuy, Quang Binh Tran Anh Vu*1,2, Dinh Van Toan1, Doan Van Tuyen1, Lai Hop Phong1, Duong Thi Ninh1, Nguyen Thi Hong Quang1, Pham Ngoc Dat1 1 Institute of Geological Sciences, Vietnam Academy of Science and Technology 2 Graduate University of Science and Technology, Vietnam Academy of Science and Technology Received 01 June 2016. Accepted 10 December 2016 ABSTRACT Study of the geological structural elements in the area of geothermal sources is important for identifying the geothermal reservoir, the object is capable of energy production. This paper presents the preliminary results of the structural study obtained by the seismic refraction data in the area of hot water spring Bang, Le Thuy, Quang Binh. The exploration was carried out in 2014 by using 150 wireless Texan instruments produced by Refraction Technology Company - USA and provided by the Institute of Earth Sciences, Academia Sinica, Taiwan. The data were collected from 4 profiles, cutting several tectonic faults around the exposed hot water source. The seismic signals were strong on the records of each instrument, especially the signals of refraction wave. The 2D seismic tomographic technique is applied for data interpretation to create the velocity structural models from 4 observation profiles. Based on the velocity structures, the area can be separated into three main structural layers, characterized generally by three velocity ranges: 3,0-4,1 km/s; 4,2-5,1 km/s and 5,2-6,1 km/s, respectively. The block separation by the faults of different size with the subsidence tendency from southwest to the northeast parts of the region is apparently reflected in the seismic data obtained in this study. The narrow .
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