In this paper,a historical review of the gravity gradiometry is given, the application of this technique to oil exploration and some other fields is described,and its development in future is predicted.

Three seismic waves illustrated in this paper refer to reflected compressional wave, refracted compressional wave and Rayleigh wave. The horizontal correlations means correlation of properties between wave fields of the three waves and correlation between seismic velocities obtained from their inversion results. The aim of the correlation is to determine the horizons as well as the strata that form the three waves in seismic sections and to provide theoretical basis for comprehensive inversion by means of cross association of the three waves. This paper is an important part of method and theory which can be used in simutaneous multitype wave exploration. It recounts the classification method and naming method based on the relation between velocity values in strata and between horizons in the section with the purpose of adopting this new forward and inversion technique for multitype wave exploraton. Finally, the paper discusses the horizontal correlation in the light of relationship between the wave field characteristics and the velocity values.

There exist plentiful stratiform and statabound metallic deposits in the Devonian strata of Qinling region along the boundary of Shaanxi Province. Under the guidance of the viewpoint that the structure clearly controls gold deposits and that paulopost alteration is superimposed upon hydrothermal solution exhalative sedimentation, this paper sums up characteristics of geophysical and geochemical anomalies of the main Devonian stratabound gold deposits in the Qinling orogenic belt of Shaanxi Province. Moreover, based on an analysis of the deposits geology and the metallogenic regularity of the Devonian stratabound gold deposits, this paper points out the indicators for prospecting of the Devonian stratabound gold deposits in this region.

The author puts forward a new view on the technology and application of the geochemical mercury survey which has been usedboth in China and abroad for years.This opinion points out the developing orientation of the mercury survey technology.It is held that mercury vapor comes mainly from structural faulted zones,that mercury anomalies are not necessarily in direct connection with various types of orebodies (except for mercury orebodies),and that mercury anomalies produced by orebodies are insignificant compared with mercury anomalies produced by barren structural faulted zones.It is also considered that mercury survey can be used in all geologic fieds related to structural faults.

In the light of the engineering application,the applying basis,effects and prospects of the high-density resistivity method in the limestone area have been discussed in this paper.

This paper reports the accumulative mechanism of elements assimilated by plants in the Xiaoxilin Pb-Zn deposit of Heilongjiang and Jiaolongzhang of Gansu. Studies show that there exist marked difference between accumulative mechanism of nutritive elements and that of toxic elements. When the nutritive elements are assimilated by plant, they are accumulated in every organ, and the organs are related to the function of elements in plants.Toxic elements are excluded when they are assimilated by plant they are accumulated in organs, where organ toxic elements exert very little or no poisonous effect upon plants.

The reflected wave of Lei-1 seismic profile measured during the high resolution exploration in 1991 is characterized by poor continuity and weak energy. Aimed at overcoming these weaknesses and solving three geological problems(thin oil,-gas-bearing layer, low porosity and the relationship between the oil-,gas-producing capacity and the development of fissures in Sichuan basin), the authors carried out the test of high resolution seismic exploration technique in 1997 so as to find out the structural form and the distribution of faults along Lei-1 profile and, as a result, obtained the collection equipment disposition and the field working technique related to the high resolution seismic exploration, thus broadening the field of oil gas exploration in Sichuan basin.

The Normalized Total Gradient has neither clear physical meaning nor complete mathematic theory as its basis,and it can only search the experimental law in the case of two and three dimensions.The authors hold that it is benefitial to get to know whether the G^H(z) has mathematic and physical foundation or not and that the one who uses the G^H(z) must take a very cautious attitude.

The application of high-strain dynamic tentative piling technique to determining limited bearing capacity of pile endpoint soil is a good method in the field of dynamic depth detection. Using high-strain dynamic tentative piling technique,one can obtain the pile endpoint resistance at each hit in the process of hammering, which is the bearing capacity of the pile endpoint soil against the pile. Dividing the bearing capacity by the cross section area of the pile endpoint, one can figure out the limited bearing capacity of the pile endpoint soil. In combination with the injection depth of pile at each hit, the continuous variation of the bearing capacity of the pile endpoint soil with the depth can also be calculated.

Geochemical distribution of elements in the surficial media is not homogeneous,and a hierarchy of chemical patterns has been indicated by Xie Xuejin et al. (1993). It is commonly known that chemical elements not only serve as the components of biomass, but also take part in bioactivities in a variety of mechanisms. This paper makes a preliminary discussion on the environmental ecological effects of geochemical anomalies of different grades.

3D seismic exploration has some problems, such as massive data, prolonged cycle between acquisition and processing and rapidly increasing costs. This paper points out that the utilization of both hign-speed network communication technology and wavelet data compression technology is a powerful means to solve such problems. The paper also deals with the economic benefit and prospects of this method.

This paper describes the technological specifications and performances of the solid nonpolarized electrode,its application effects and its comparison with the same sort of devices produced both in China and abroad.

The establishment of the Aeromagnetic Database of the Provincial Level is a project assigned by the Bureau of Geological Survey.In order to provide qualified data for the establishment of database,the Arogeophysical Survey and Remote-Sensing Center,aiming at utilizing large quantities of available aeromagnetic simulation data and based on test and summarization,has suggeted carrying out digitization on the aeromagnetic Δ T profile centimeter base map by means of digitization instrument and described its method,technological process and requirements for testing quality.The digitization of aeromagnetic simulation data obtained from 138 surveyed areas by Aerogeophysical Survey and Remote-Sensing Center has been completed,and the aerogeophysical data to be put in the database has been collected from most areas of China.In addition,this method has been recommended to various geological exploration units.

Based on an analysis of the geological and geophysical data of the Qixiashan lead zinc polymetallic deposit,this paper systematically describes the genetic model,the indicator model and the ore prospecting technical serial model of the ore deposit.These three sorts of models make up the geophysical exploration model of the Qixiashan lead-zinc polymetallic deposit in Nanjing.