Refraction Static Correction Of Datum Network Adjustment Method

During the process of seismic prospecting，people usually suppose that：theobservation system is loaded on the horizontal plane, the underground medium isuniform layer media and so on. In that case, people could surely get the standardtime-distance curve, if the shot release power and the receiver receipt the seismicsignal. However，there is no so ideal condition in fact. In the real, when the seismicprospecting is done on the land, the surface condition of the land is usually verycomplicated (for example: the ups and downs of the earth’s surface), at the same time,the layer with low speed or reducing speed is always not stable and so on, all theseconditions will absolutely influence the time of the seismic wave propagation，in thatcase，we will get obtain the distorted time-distance curve, and the results of the dataprocessing will be effected too.In order to solve these problems related in the first paragraph, people think out themethod of static correction. The main function of this method is to eliminate theinfluence of the surface elevation and the layer with low speed or reducing speed fortravel time of the seismic wave, and then satisfy the aim of Inspire and receiveseismic wave under ideal conditions. Nevertheless, many old static correctionmethods are useless in some area with complicated surface conditions. In order tofurther enhance the quality of the data processing of these districts, we take the datumnetwork adjustment method of the surveying to the process of static correction, andinvented a totally new method:‘Refraction Static Correction of Datum NetworkAdjustment Method’. We have applied this new method to the processing of modeldata and real data, and the results show that this new method is a useful one.Specifically, this paper mainly includes the following several parts: At first, this paper introduces some theory about the datum network adjustment,including how to establish condition equations, the calculation of adjustment, thetalking of the measurement accuracy and the error the calculation.Secondly, I have done some research about the refractive Static in this paper. To bespecific，this has talked about several methods of refractive static, including theirprinciple, processing and their own advantages and disadvantages. These methodsinclude EGRM（Extended Generalized Reciprocal Method）,2-d Iterative RefractionStatic Correction,3-d Iterative Refraction Static Correction, Section DrawingRefraction Static Correction, Wave Extrapolating Static Correction Method, FullyDifferential Refraction Static Correction, Refraction Static Correction of DatumNetwork Adjustment Method and so on.And then, in order to verify the function of the new method, this paper design acomplex shots layout, and give them a error of10ms, the result shows that thismethod is very useful.At last, this paper applies this method to the real seismic data processing. From theanalysis of the processed stacked section, we can find that this method is veryfunctional both for the long wave static and the short wave, and this prove this methodto be a useful one.