Based on more than 900 cases carried in volume of geophysical and geochemical exploration, The history of mineral deposits discovery, the authors deal statistically with the effects of geophysical and geochemical exploration in search for various mineral deposits and the ore species for which the ore-prospecting results are prominent. The experience gained and the lessons drawn are tentatively summed up in such aspects of train of thought as the arrangement of geophysical and geochemical work (with the emphasis placed on the search for metallic ore resources), the anomaly interpretation (mainly qualitative interpretation) and anomaly inspection.

China Geological Survey has energetically carried out multi-objective regional geochemical investigation in recent years and, as a result, disclosed large quantities of microphenomena which were not understood in the past. The research and evaluation of ecological environment seem to be the major problem facing us. This paper has put forward and probed into the problem of ecological geochemistry and its evaluation, which includes the definition, train of thought for research, technical line, eco-geochemical evaluation and global, regional and local eco-geochemical evaluation.

This paper deals with the development of three-dimensional seismic exploration in the coal departments of China in such aspects as designing, acquisition, processing and interpretation techniques as well as the achievements made in recent years.

This paper describes statistical characteristics of rock and mineral physical data from the whole Jiangxi Province and two stratigraphic regions, which include 53 741 rock and mineral density data, 12 677 magnetic susceptibility data and 12 424 residual magnetization data. The results serve as reference materials for geophysical exploration work in Jiangxi Province.

With modern multiple stratigraphic classification as the theoretical basis, the density, susceptibility and residual magnetization of regional lithostratigraphic formations as the research objects, and the Fisher grouping for maximum homogeneity as the mathematical means, the authors defined and determined physical stratigraphic boundaries of the stratigraphic column in Hebei Province. Their geological implications have been discussed, which include crustal evolution, biotic succession, lithosphere dynamics, crust-mantle differentiation, lithofacies distribution etc.

Based on an integrated analysis of all kinds of geophysical data, this paper deals with such characteristics of geophysical fields in east Henan plain as the gravity field, the magnetic field and seismic reflective waves. Through combined inversion of gravity, magnetic, seismic and drilling data, the authors carried out regional geological research and integrated geological explanation, and pointed out the coal-searching target area.

In some areas of Gansu province, the common geophysical methods for groundwater exploration seem to be ineffective in classifying the structures of strata, locating the positions of faults, finding out the shape of bedrock surface and estimating the distribution of groundwater. Using TEM exploration combined with an analysis of borehole data, the authors made some breakthrough in solving the above-mentioned hydrogeological problems. The results prove the effectiveness of this method in ground water exploration.

Since the beginning of 1980s, 1:200000 geochemical exploration in Weichang sheet of Hebei Province has experienced three times of prospecting work. Different methods and techniques yielded obviously different results. This paper has made a fairly thorough analysis on the methods and techniques used as well as their effects, and pointed out the importance of researches on methods and techniques in 1:200000 geochemical exploration.

With a set of apparatuses designed by the authors, we can detect the relationship between the radioactive counting of radonadsorbing active carbon and the radon concentration of the environment in which the active carbon exists. The total counts of radon in active carbon orγrays released from its decay daughter are in linear relationship with the radon concentration. After correction, the total counts of γrays can be converted into radon concentration in the environment.

The authors carried out forward modeling on dispersion curves of Rayleigh wave in three-layer media and then analyzed characteristics of dispersion curves. It is proved that the dispersion curves never intersect with each other, thus correcting the false opinions held by some scholars. When a low-velocity layer exists, the fundamental guided curve will become complex, some guided waves will assume intersection trend, and some guided waves show phenomenon of truncation in certain conditions. According to the analyzing results, the forming mechanism of the zigzag dispersion curves has also been explained.

The author has researched the relation between AB/2 and h of resistivity sounding on shallow investigation by means of contacting between measuring curves on objects and boreholes. The measuring curves on objects assume brokenline form, because their distance of the electrodes should be arranged by regular intermission when measuring on field. The AB/2 of turing points reflecting lower stratum is equal to h, depth of stratum.

Based on investigations of the Gachun silver polymetallic deposit in western Sichuan and the Wunugetusan lindgrenite deposit in Manzhouli, this paper deals with the positioning and predicting roles and the application effects of the electrical method in prospecting for concealed metallic deposits.

The magnetotelluric responses of vertical dykes have been theoretically deduced. First, their analytical expressions of apparent resistivity within the high resistance basement and the low resistance basement were deduced under E-polarization and H-polarization respectively. Then through programming and calculating, lots of graphs were drawn. Finally, careful analysis of these graphs led to the summarization of many characteristics of apparent resistivity curves for magnetotelluric responses of dykes.

With practical examples, this paper deals with the effects of applying GDT high-resolution geological detector to hydrologic exploration in Shaanxi Province.

By well logging smoothing processing and depth correction, the production log data is pretreated. Pretreatment of the production log data is realized by use of the visualized program developed by visual c++ and c compatible. It offers convenience for latter interpretation making pretreatment of the multiphase flow log data software. The interpretation experiment of practical log information shows that precision and dependability of interpretation are greatly improved when the method is applied to interpretation of liquid producing profile log information.

In geophysical exploration work of the Nantian geothermal field, areal electrical sounding was arranged, three-dimensional resistivity data were collected, and apparent resistivity view was constructed. As a result, the fault structural form in the surveyed area is disclosed, the drilling projects arranged for geothermal exploration and exploitation prove to be successful, and the geological effects are excellent.

This paper describes in brief the semi-intelligent processing and interpretation software for gravity and magnetic anomalies along the profile of rolling topography, dealing with its basic principle and technique, the method for the realization of its system and its major functions. The optimized direct and inverse calculations were carried out for the aeromagnatic profile measured in a certain area of Yunnan Province.

The connection of the Georadar data sever and the characteristic points of the wavelet transform model is revealed by means of studying the features and rules of characteristic points of the seismic data wavelet transform model. Based on the above studies, the authors processed the characteristic points of the transform model at all levels. With these achievements, we can obtain better results in tackling the nonlinear problem.

In this paper, the principle of processing the GPR profile with coherent analysis was briefly described, and the program of coherent enhancement processing was composed on the basis of characteristics of the GPR profile. The processing of the field GPR profile in the limestone region with this program demonstrates that coherent enhancement processing of the GPR profile can effectively improve the continuation of the events reflected from the same interface and contribute to tracing the reflecting interface without the distortion of the event form.

In this paper, the distributed expert system (DES) based on Internet is described. The construction and application of DES will help to solve the bottle-neck problem of knowledge acquiring and reduce the difficulty of complicated problems. In the application of DES to the dam safety assessment, the experts knowledge sharing in Internet and the distributed problem solving seem to be the key factors, which would decide whether the DES could solve the problem or not.

Based on network management information system of enterprise in combination with an analysis of research actuality in forecast system of mineral resource evaluation and problems encountered in geological exploration, this paper presents the network information system for mineral resource exploration. With the social and industrial development tendency in mind, the authors deal with factors of management and business demands as well as the necessity and urgency of the construction of the network information system. Considering the defects of the traditional MIS and the merits of the Intranet MIS, this paper has determined the basic framework and working method on the basis of Intranet MIS. In addition, the structure and function of the network system have been designed.

This paper deals with the application of the Rayleigh wave technique to reservoir survey with the Shimen reservoir as a case study example.

During the foundation pile construction, the detection of concealed karst caves and other harmful geological conditions in the limestone body within an area of three times the pile diameter at the pile end is of important practical significance in deciding the ending of the drilling and pouring the foundation pile. With the seismic reflection wave method as the theoretical basis and the single transmitting and single receiving seismic exploration and foundation pile test technique as the in-situ working means, the authors, incorporating the interpretation experience of exploration data, deal in brief with the application of the above technology to the exploration of pile end limestone in a certain construction site and its verification result. The achievements made by the authors provide a valuable method and technique for solving similar problems in future.

The method for determining the load bearing capacity of pile is summarized and the basic principle of the transient surface wave test technique is described in this paper. The application of this technique to estimating the bearing capacity of pile, in particular, is presented with a practical example. The standard penetration test blow count (N_63.5) related to the shear wave velocity could be used to estimate the bearing capacity of pile. The correlation model of Vs with qsik and qpk was constructed through N_63.5. The transient surface wave could be used to test the shear wave velocity of soil around the pile and estimate the bearing capacity of pile.

With the rapid economic development of China, the pile foundation method has been widely employed thanks to its unique merits. To guarantee the accuracy of the designing parameters, it is very important to analyze and investigate the distribution state of strain and stress. This paper deals mainly with the principle and procedures of the sliding micrometric linear technology for monitoring strain (internal force) of the pile body. A practical engineering example is given to illustrate the effectiveness of the linear technology for monitoring strain in static load pile test.