in 1993, geophysical exploration work for metallic deposits was forther reduced inChina and the amount of aerogeophysical work was only one third that of 1988. In contrast, theOil and gas geophysical exploration work was still growing, and the annual amount of continentalthree-dimensional seismic excploration exceeded 9000 km². The hydrologic, enyineering and environmental geophysical exploration market remained prosperous, which promoted the developent ofrelevant techniques. New types of multi-functional shallow seismographs or engineering detectorswere unceasingly desired by many units. In-house computer processing, interprotation, simulation, display and software researches which were less subject to the restriction of fials as wellas some theoretical studies remained in progress and, as a result,some remarkable achievementswere gained. The international market projects undertaken by China increased to some extent;nevertheless, the total amount of work in this aspect remained very limited.

in this paper, the three-dimensional fluorescence oil-gas geochemical exploration methodwas establlished,some geochemical exploration indices were tentstively discussed, and rock samplesof a certain region were analysed. As a result,some conclusions of practical significance have beenreached.

The underground pressure difference,concentration difference and specific gravity difference in the oil and gas field cause hydrocarbon substances to travel towards the surface. Oil andgas shows commonly seen at surface are macroscopic indicators of hydrocarbon percolation;nevertheless, more extensive hydrocarbon percolations at surface are exhibited by microscopicindicators, which can be detected only by precision instruments. Jonnes (1975) has noticed thatthe near-surface soil gas is chemically quite consistent with gas in underground gas-bearing reservoirs and gas shows in drill holes. Yan Wenbo et al. (1990) have found ultraviolet absorptionvalues of oil and gas reservoirs, saying that the values decrease in order of oil-soaked rocksedimeotary rocks over the oil reservoir→soil over the oil field→soil of the barren area. Theconcentrations or relative intensities of hydrocarbon indices determined by borehole geochemicalexploration decrease gradually from the oil and gas reservoir to the surface, and this providesaudio-visual basis for the trash of oil and gas vertical migration.

This paper points out the problem that exists in the traditional combined gravityseismic inversion,and suggests full utilization of seismic data as form parameters to make fielddiviaion. As for the gravity effects of the separated target horizons, Parker formula is used tomake inversion. In this way, interfaces at fairly great depths or without reliable seismic datamight be evaluated.

Based on frequency divergence characteristics and half-wave length theory and utilizing absolute Phase expansion techmique,this paper advances a three-dimensional tomographicimaging method for shallow ground media. Corresponding computer aimulation has been madewith excellent results obtained.

in this paper, detailed description is made on gold prospecting with gammaenergy apectral method in such aspects as its geological basis and nuclear geophysical basis,the interpretation and characteristics of gamma spectral anomalies over gold deposits, and thetechniques of this method. Some examples are given illustrating the application of samma energyspectral method to gold prospecting both in China and abroad. Practice has demonstrated that,of all current geophysical gold prospecting methods, the gamma energy spectral method(combinedwith other methods) seems to be the most economical, most effective and most readily popularized method.

The presnet paper presents the boundary element numerical simulation techniquefor the magnetic field, the electric field,the dip angle of the polarized ellipse and the apparentresistivity anomaly in the very low frequency electromagnetic method of the two-dimensionalgeoelectric model and, on the basis of calculations, discusses the basic regularity of topographicinfluence and the method for its correction. The composed computation program is also suitablefor various sorts of frequency electromagnetic sounding methods that can meet the requirementsof far field on the two-dimensional nonhorizontal layor.

This paper deals in detail with the basic principles and interpretation techniques forthe detection of underground line pipes with the direct detection mothod.It advances a new vectorintersection drawing method for determining positions and depths of line Pipes and givingconfidence of the detection results.Results with high. confidence can ho provided in situ.Description is also made con-cerning the instrument and equipment for line pipe detection and their application of effects.

A fundamental advantage of mierogravity survey is that it can reflect densityvariation of underground substances and quite accurately detect faults. Exemplified by Xianningwarm spring of Hubei province,this paper deals emphatically with the relationship between warmsprings and gravity anomalies.