Entity

Time filter

Source Type


Zhang J.,Qingdao University | Zhongcheng L.U.,Geo Engineering Investigation Institute of Qingdao | Zhao Z.,University of Waterloo
Nature Environment and Pollution Technology | Year: 2015

In the special geological and water environment of estuarine reservoirs, salt water in the deposits will intrude into the overlying freshwater and affect the water quality and normal operation of the reservoir. It is, therefore, important to identify the spatial extent of salt. Based on site survey, drilling and laboratory data, a quasi-3D model was established, simulating the migration of salt in the initial impoundment of the reservoir. As a result, if the impoundment happened in the normal water year, when the water level rose to 0.5m, salinity ranged from 0.3g/L to 2.8g/L on the surface; at the level of 1.5m, salinity ranged from 0.3g/L to 1.3g/L; and at the level of 4.5m, salinity varied between 0.3g/L and 1.55g/L. This will lead to a better understanding of the implications of groundwater hydrology and improve protection of surface water quality during the extraction of water resources. Source


Wang J.,Jilin University | Yang G.,Jilin University | Xue L.,Jilin University | Zhang J.,Geo Engineering Investigation Institute of Qingdao | And 2 more authors.
Mining Science and Technology | Year: 2011

The Changling fault depression passed through three stages of evolution: a period of faulting, a period of subsidence, and an inversion period. The fault lifted the whole area and the formation was eroded during the late Yingcheng formation, the late Nenjiang formation, and the late Mingshui formation. The denudation quantity of eight wells located in the study area is estimated by the interval transit time method and by the formation trend extension method using seismic and drilling data. Inversion back stripping technology with de-compaction correction was used to restore the original sedimentary thickness step by step and to recover the burial history at a single well. Two profiles were selected for the recovery and study of the tectonic evolution. The study confirmed that the primary major gas bearing structure formed due to thermal shrinkage lifting during the late Yingcheng formation. Successive development in a pattern during the late Mingshui formation led to the formation of the primary gas pool. Vertical differential uplift during the late Nenjiang formation formed the Fulongquan structure during the late Paleogene. At this same time a secondary gas pool formed. A large scale reverse developed late in the Mingshui formation that provided the impetus for formation of a secondary gas pool. It is thought that the migration and accumulation of oil and gas was controlled by lithologic character, fracture, and structure. The local uplift in the vicinity of the hydrocarbon recession is most conducive to the collection of hydrocarbon gas. © 2011 Published by Elsevier B.V. on behalf of China University of Mining & Technology. Source


Ma C.,Jilin University | Zhao Q.,Qingdao University | Zhang J.,Geo Engineering Investigation Institute of Qingdao | Zhao G.,Bureau of Land and Resources of Shaoxing City | Lu Z.,Geo Engineering Investigation Institute of Qingdao
Disaster Advances | Year: 2012

Rainfall-induced abrupt geological hazard of collapse, landslide and debris flow have frequently occurred in flood season in Qingdao area. To avoid the disasters and reduce losses, we carried out the study and construction of the prediction and forewarning system of abrupt geological hazard. Based on the Survey of Geological disasters, we mastered the spatial and temporal distribution of the abrupt geological hazard in Qingdao area, analyzed environmental conditions and influencing factors, studied the relationship between heavy rainfall and the occurred Geological disasters, built the system and related databases with the application of multi-factor comprehensive evaluation model. The system consists of software, hardware, database, monitoring system and network communication system. In the running four years, we successfully conducted many geological disaster prediction and forewarning and the accuracy rate is about 93%, to avoid property loss of about 16 000 million Yuan. Source


Zhang J.,Ocean University of China | Lu Z.,Geo Engineering Investigation Institute of Qingdao
Journal of Coastal Research | Year: 2015

With respect to the design and construction of grouting and drainage works, the conventional method is to locate the grout hole and drainage hole in the direction perpendicular to the natural rock or excavation surface. The anisotropy of structural planes in leaking water or grout has been neglected in the design of the works. Investigation data about rock fissures are studied to find out the distribution law of structural planes and know how to best locate boreholes with respect to structural planes in order to get an optimum effect of grouting and drainage. A new method is put forward for locating grout holes and bore holes. The practice from the Houhe Reservoir shows the inclined borehole less than 75° has an obvious efficiency, and among the boreholes within the angle range of 65 to 75, the optimum locations have an average efficiency of 2.11. © 2015 Coastal Education and Research Foundation, Inc. Source

Discover hidden collaborations