Improving The Deep Seismic Exploration Resolution Methods Of Theoretical And Applied Research

It is heaven attention, but to hard to resolved, how enhance resolution of deep seismic exploration, especially for land faces sediment basins, because seismic exploration resolution is limited for deep stratum, under 4000 meters, and the result is few at least at present. In fact, the resolution of seismic exploration includes two meanings: seismic wave resolution and stratum, particularly for thin-beds, resolved power. There are some difficulties in the land's deep exploration:(1).because of the restrictions of exploding conditions,the bandwidth and main frequency of the first seismic wavelet are not enough;(2).For the more extent absorption and attenuation to seismic wave,seismic wave resolution tend to lower.So the thesis established two different research routes:First,based on the theory of the high resolution seismic exploration ,through the research of the exploding theory and mechanism,and observation and analyzing to the first seismic wavelet, the approach of the seismic wave resolution of deep reflection informations are finally obtimized.Secondly,the thesis introduced approach which separate stratum informations from the seismic waves.That is the forcasting approach based on the similar seismic and geological backgrounds which may inspect the spatial distributing,configuration characters,and subtle relation each orther.It is possible that improve the resolution of seismic deep exploration by the improving of identffiable capablity to the thin-beds. The importance results and achievements in the thesis are follow: (1)there are comprehensive analysis to the vertical, horizontal resolution, relation each orther,mostly factors of effectting on spatial resolution,and discussion to theory of the reflecting coefficent spectrum for the thin-beds. (2)It is researched to the exploding theory and mechanism of dynamite,and observation and analysis to the initial seismic wavelet,including the dynamite compound,makeup, and classified,also to the promulgating disciplinarian and theory of the shock wave,stress wave,and first seismic wavelet in the different areas exploded.The qualitative and quantitative researches are made for first seismic wavelet at the elasticity area by means of approach of deep well observation. (3)Be based upon the above-mentioned results,after practical application are accomplished the result is obvious in the Lunnan area and Wumaying area. (4)A new research theory is put forward:the research approach based upon similar seismic and geological background.It is pivotal to the identif~r of deep thin-beds. (5)The simple expression have been obtained with the estanblished theory of thin-beds reflective coefficient spectrum,and ulteriorly the effect factors are analyzed from stratum velocity and thickness to the reflectance spectrum .Farther more,the geophysical meaning and practicality of the computing resulty had also identified. (6)The approach application had been come to true after research the effect factors from the stratum velocity and thickness to the reflectance spectrum. (7)A numbers of the computation are finished by the synthesizing trace record.After ananlysing the results,we finally got the approach and steps of using this theory. (8)The approach be proved with practicality after it is analyzed for the rationality of computing result on the practice seismic data and geologically confirmable interpretation.