In the past few years, the theory of all direction imagery for local gravity and magnetic anomaly sources under complex conditions has been developed for the first time by the author. This paper gives a summary of this theory, which includes the practical value and academic significance of the theory, ther general forward expressions for spherical harmonic series of 3D body gravity and magnetic anomaly in the spherical coordinate system, the all directional continuance and all directional inversion of 3D body gravity and magnetic anomaly.

The pyrite type copper polymetallic deposits are volcanics deposits related to submarine volcanic eruption sedimentary formation, and the mineralization occurs in marine intermediate acid spilite keratophyre sequence generally with relatively high content of trace elements. Host strata are dominated by Cu, Pb and Zn in association with Sb, Ba, Ag, As, Bi, Hg, Cd etc. These elements regionally form large areas of geochemical anomalies, whose main bodies correspond to orefields. Large scale rock geochemical survey in the ore district shows that distinct primary anomalies of these indicator elements are alternately in conformity with the mineralization enrichment positions of the ore deposit, showing indistinct horizontal zoning and obvious vertical zoning. Elements of different indicating significance are concentrated in different positions of mineralization, exhibiting zonation. Such zonation is an important geochemical parameter for evaluating denudation extent of mineralization and ore hunting prospects.

Based on an integrated study of geochemical data obtained in southern Songliao basin in the past 20 years, this paper has given a rough description of the oil and gas micropercolation and origin of geochemical anomalies in this area, the main factors affecting surface geochemical exploration, the effectiveness of geochemical indices, the technique for extracting anomaly information, and the model of geochemical anomalies, and summed up the effective oil and gas geochemical technical series suitable for this area, and a suite of techniques for elimination of interference, extraction of anomaly information and interpreation and appraisal of geochemical anomalies.

Besides introducing some basic concepts such as fractal and fractal dimension, this paper describes several types of fractal dimensions. Based on geophysical characteristics of fractured formations of deep igneous rocks in Daqing, the paper tries to give an quantitative interpretation of fractures with the fractal theory in view of self similarity of fractures. According to the method described in the paper, the logging data from the fractured reservoirs in deep igneous rocks of Daqing were processed by programming, with the production introduced. Furthermore, the relationship between fractal dimension and fractures and the factors affecting the fractal dimension of fractures are discussed.

This paper describes in detail the process of numerical modeling forthe apparent resistivity (in direct current domain) to 3-dimensional underground geological bodies according to the boundary integral equation and the spatial locations of the bodies. Based on previous theoretical basis and progressive modification in some aspects, the authors modeled and examined the response to several different kinds of sounding devices. As a result, some principles concerning the locations of underground electrical bodies and the corresponding relationship between the geometric parameters of underground objective bodies and the types of characteristics of apparent resistivity anomalies were obtained.

Image processing techniques such as shadow and lamination analysis were developed for the newest compiled regional gravity,aeromagnetic and geochemical data of Tongbaishan Dabieshan area.As a result,plenty of information has been obtained.The information contributes greatly to the division of tectonics,the determination of faulted belts and concealed geological bodies,the ore prospecting prognosis and,especially,the suggested Mulanshan block related to the expansion of northern and southern Dabieshan blocks along the suture zone caused by Indosinian Yanshanian continent continent collision.The achievements are satisfactory.

Based on the role of difference technique in electric water prospecting,this paper has proved that the numerical algorithm is of some reference value in data processing and improvement of signal to noise ratios.

Precipitation is one of the important factors affecting the result of soil gas mercurometric survey.Heavy rain or saturating rain would lead to drastic decrease of mercury content in soil gas or even to the disappearance of anomalies.In contrast, when the amount of precipitation is relatively small,the mercury conent of soil gas may sometimes show obvious enrichment.

With practical engineering examples, this paper probes into the effects of applying ground penetrating radar technique to engineering construction and geoscience exploration.

Following a brief description of the geological and geophysical prerequisite of the study area and the techniques for radar detection, and based on an analysis of the radar wave characteristics of the karst in the known collapse areas, the authors established a typical model for anomaly interpretation,discriminated radar wave anomalies in unknown areas, and inferred the development of karst in concealed areas. The results show that geological radar is an effective method in the investigation of karst collapse.

A mathematical model of the vibration at the upper segment of a pile when there exist severe defects is put forward based on theoretical analysis, and the curve characteristics of its low strain test is described according to engineering practice under condition of transient shock.

Combined with the practice of seismic prospecting of stake base,this paper has discussed the characteristics of different interference waves and the application of anti jamming measures. In addition,some examples illustrating the effectiveness of this method is given.

This paper describes the working principles of the ground penetrating radar and the techniques for inspecting datum piles.With ZH11A datum pile inspection in a certain district of Zhangshu as an example,the paper analyses the relationship between characteristics of radar wave sets of large diameter piles and structures of pile bodies,thus providing basis for applying ground penetrating radar to non destructive inspection of large diameter piles.