This paper has analyzed the possibility of further sieving ore-induced magnetic anomalies in areas of detailed work and put forward the working order for sieving ore-induced magnetic anomalies in such areas.

The North America gravity database as well as database from Canada, Mexico and the United States are being revised, and the revision includes the following two items: the use of the internationally accepted terrestrial ellipsoid for the height datum of gravity stations rather than the conventionally used geoid or sea level, and the modification of procedures for calculating gravity anomalies, including corrections for theoretical gravity, atmospheric effect, height effect, Bouguer effect, indirect effect, terrain and bathymetry effect, and isostatic compensation effect.

Water geochemical survey, one of the geochemical exploration methods, has a great advantage in search for hidden ores and in evaluation of ecological environment for human residence. Based on a review of the history and present situation of water geochemical survey in the world, it is held that in this field we should pay special attention to such aspects as basic theory, mineral exploration, environmental survey and monitoring, earthquake prevention and hazard mitigation as well as combination of varied methods so as to improve the technique of water geochemical survey and bring its role into full play.

Since the word "the earthquake attribute" has been introduced in the geophysics,the earthquake attribute technology obtained the widespread application in the oil gas exploration development, on the consult massive pertinent datas foundation, to the earthquake attribute classification, the earthquake attribute technology history and the present situation has carried on the induction and the summary, on the condition of oil and gas exploration and the development reality ,we have discussed the earthquake attribute technology development tendency.

This paper deals with the present situation and the problems faced by the seismic exploration technique for coal resources, with the emphasis placed on some key problems which deserve further study and much attention in future, such as frequency, high-density collection, the strengthening of before-stack studies and the application of single-point seismic technique. The aim is the realization of high-precision exploration so as to meet the ever-increasing demands of the production work, construction and safety of the coal mine.

Based on a comparative study of the element content of stream sediments in various river months, gulfs and their provenances, the authors found that the enrichment coefficients of trace elements in the shallow sea environment have the variation regularity of K(Ni)＞K(Cr)＞K(As)＞K(Cu)＞K(Zn)＞K(Pb)＞K(Hg)＞K(Cd), suggesting that the migration mechanisms of various elements are somewhat different from each other. The regional enrichment coefficients of some elements deviate remarkably from their average values, implying that some elements have experienced additional input, most probably caused by the superposition of human pollution.

Disturbance of organic materiao is a main factor effecting geochemical exploration in forest marsh landscape area for many years.This paper researchs perliminaryly into the disturbed principle of organic material to character of supergene-geochemistry. The result showing that organic material disturbed to character of supergene-geochemistry with absorbed elements directly and changed physicochemical condition of environment. And both of ways has relations closely. Researched conclusion explained better the varation of abnormal of chemical exploration as disturbance of organic material.

This paper deals with the distribution regularity of Au in-10～+60,-60～+100,-100～+160 and -160 meshes for Layer A soil in forest and swampy areas of central Heilongjiang Province. It is considered that -100 mesh can be used for low density deep penetration sampling in geochemical survey, and that sampling with this granularity can help to find anomaly effectively.

This paper has summed up the forward calculation of gravity and magnetic anomalies caused by irregular models, analyzed the merits and shortcomings of each method, and discussed the development trend of the forward calculation for gravity and magnetic anomalies caused by irregular models.

According to the distribution regularity of the electric fields of surface single spot current source and the basic thought of the high density resistivity prospecting method,and from the principles of the pole-pole electrical prospecting and the seismic prospecting,this paper puts forward a network electrical prospecting system, which uses one current electrode to perform power supply, with the other electrodes conducting synchronous prospecting. The synchronous rapid measurements such as Wenner pole-dipole,Wenner pole-dipole and pole-pole array of the high density resistivity method can be realized by indoor data-processing. This technology can enormously cut down the working hours of data collection in open field and greatly improve the efficiency of the electrical prospecting. It has been applied in many engineering projects,such as foundation prospecting,the measuring of the height of the water flowing fractured zone in working faces,the detection of the water source of coal well water bursting.

Three or more than three effective coalfield logging physical character parameters from the observational drill holes were used to analyze and compare anomalous characteristics of all curves for the purpose of detecting prominent features of coal seams and wall rocks and making qualitative interpretation of the bed of interest. The thickness-determining interpretation utilizes emphatically typical characteristic values of apparent resistivity and artificial radioactive curve anomalies to determine the depth, thickness and structure of the coal seam. The morphological feature, index horizon and correction method of the curve anomalies of various physical character parameters are sometimes also used to study individual coal seams.

Pores and fractures in rocks described with the aspect ratio as their shapes can be simulated by ellipsoids. The Berryman dispersion method was used in this paper, with which the Poisson's ratio, velocity and density of porous rocks are related to the porosity, fluid saturation and pore aspect ratio. The effect of aspect ratio on AVO response was also studied by a shale/sand modeling. The results show that the reflectivity or amplitude versus incidence varies with the aspect ratio change under the condition of the same mineral component and porosity, and the distinguishability of gas in AVO cross-plot decreases with the increasing aspect ratio. The smaller the aspect ratio, the easier the gas layer recognition by cross-plot.

The signal-to-noise ratio and resolution ratio of seismic data acquired from the deep layer of Liaohe basin are relatively low due to the peculiar seismic geological conditions, which has greatly restricted further exploration and development of the Liaohe oilfield. In order to break the restriction of seismic data quality for exploration and enhance the signal-to-noise ratio and resolution ratio, research workers of the Liaohe oilfield chose northern Oulituozi in the eastern sag of the Liaohe basin as the study area and employed a series of techniques such as optimum lithologic excitation, useful weak signal protection and variable geometric acquisition to conduct the test. The result is proved to be quite satisfactory.

Sampling procedure is a key to get a reliable observation in the application of nano-scale particle survey to mineral exploration in overburden areas.An effective sampling device and an appropriate sampling amount constitute the major controlling factors for successful accumulation of nano-scale particles. Liquid collectors and dynamic sampling were tested to select the sampling device, layout and sampling time. The results show that the man-powered sampling device can produce much better response than the battery-driven sampler and that, to get satisfactory anomalies, we should totally collect more than 9 liters of pumping gases at each sampling site. It can be concluded that the materials the authors collected are nano-scale particles rather than real gases, and that greater power is needed to release them from the soil.

the Xiangcheng-Daocheng-Derong area is located in the western Sichuan continental platform, with the relative height difference more than 2000 m. In this area, dissection is deep, geographic conditions are unique, surface geochemical environment is complicated, and ore-prospecting indicators are not clear.All these factors make it difficult to find new deposits.Traditional geochemical data fail to find some anomalies related to mineralization.In some cases, ore bodies are deep and anomalies are weak, leading to ignoring the deposits.The subinterval area median contrast filtering method can solve the problem of recognizing weak anomalies in the low-background area and high-background area.

An analysis of the relationship between the elements in the earth's crust and the life elements and a study of the pathogenesis of some typical endemic diseases have revealed that unbalance of trace elements in geochemical environments is likely to result in human diseases. The factors affecting the balance of trace elements in human bodies are geochemical environments and nutrition components. The authors hold that the important measures that can guarantee the balance of trace elements in human bodies lie in the optimization and utilization of geochemical environments and the balance of bioavailable trace elements from the nutrition.

Based on survey and a series of statistical analysis of peony in Luoyang, this paper holds that the growth and quality of peony in Lyoyang are related to the geochemical background. The high contents of P,K,Mn,Cu,Zn,Mo in the study area provide rich nutrients for the growth of peony.Cd,Cu,Zn,As and some other elements can lead to the growth of flowers.

In the Putian high-quality loquat producing area, the content of such beneficial and nutritional elements as N, P and K is suitable, and the content of harmful elements such as As and Hg is in accord with the environmental demand of the unpolluted fruit producing area. In the ecological system of soil-loquat, the variation regularity of total content and effective content of beneficial and nutritional elements is similar from the depth to surface (or from surface to the depth). In different organs of loquat (rootlet→shoot→leaf→fruit), harmful elements are enriched mostly in root, and subordinately in shoot, whereas beneficial and nutritional elements are enriched mainly in leaf, and their content obviously decreases in loquat fruit. The red soil with the pedogenic parent material being granite or intermediate-acid volcanic rock, especially granite, is relatively suitable for growing loquat.

Leakages usually destroy the stability of an ash dam,so it is important to get the information of the leakage position, the area and elevation of the leakage, and the soakage line of the dam with the purpose of tackling these problems. The measurement of the soakage line and the detection of the leakage distribution as well as the relationship between the distribution and the outflow point therefore constitute the key problem in analyzing the stability of the ash dam and performing the reinforcement of the dam. This paper discusses the geophysical methods for detecting the ash dam leakage and the performance procedure in field survey, and also deals with the effect of these methods. It is shown that such techniques as the spontaneous potential method, the ground penetrating radar, and the high density resistivity method seem to be the effective methods which can be employed to detect the outflow location in front of the ash dam, the inner soakage state of the dam, and the position of the soakage line.

Exemplified by some results obtained from the electric imaging detection of active faults in Zibo City, this paper described the method for geological interpretation and analysis of images from the electric imaging technique, and studied the input impedance range of the instrument for urban active fault detection as well as some problems which deserve attention in data processing and inversion. With three typical electric imaging profiles that control the Zhangdian-Renhe fault system as examples, the authors inferred positions of the concealed faults and verified the correctness of electric imaging results through drilling. It is thus concluded that the electric imaging method can obviously play a very important role in the detection of urban active faults.

As geological conditions are very complex in the limestone area, it is very important to investigate topography of limestone and distribution of karst and fractured limestone for analyzing stability of the foundation before construction. The surveying work in a limestone site of Malaysia by means of ground penetrating radar (GPR) shows that the interpretation results are consistent with the results of drilling. It is thus concluded that geological information of the foundation can be obtained by means of GPR, and the results can be regard as important reference materials for design and construction.

This paper makes a systematic analysis of the methods for detecting close-interval parallel pipelines and multi-able pipelines, which include selected excitation method, line ball method, direct method, grab method and computer inversion interpretation method. The key points for detection are summed up in this paper. It is pointed out with practical examples that the detection precision can meet the need if proper methods are used.

Based on an analysis of magnetic anomaly characteristics inside the perpendicular cylinder and the result of model piles test, the authors studied the magnetic anomaly characteristics inside the reinforcement cage of the cast-in-situ pile. The results indicate that the magnetic anomaly curve along the borehole depth inside the reinforcement cage has the form "a valley between two peaks, on which a wide negative anomaly region like a saddle corresponds to the middle part of reinforcement cage". The bottom of the reinforcement cage corresponds both to the inflexion of the magnetic anomaly curve and to the maximum of the magnetic anomaly gradient curve.

With the engineering investigations in karst areas as examples, a geological profile was studied by using the well seismic wave tomographic imaging technique. The technique has been proved to be a digitized and high accuracy technique suitable for dividing and detecting locations of karst, cracks and fracture zones.