Aeolian Environmental System Modeling Of Desert Area In Seismic Exploration

Seismic exploration is the main method of finding oil and gas resources. In actual seismic exploration, there are a variety of adverse factors, such as unknown underground environment, complex surface structure and various noise interference above the earth’s surface and so on. These adverse factors will eventually be reflected in the form of random noise in the seismic data, which reduce the quality of seismic data. As a result, we could not locate the position of the underground oil and gas resources, and wasted the manpower and material resources. Therefore, how to effectively improve the seismic data quality, the capabilities of noise cancellation technology of the seismic data, becomes the difficult problem in seismic exploration.Actual seismic exploration is invariably corrupted by a variety of random noise, of which Aeolian environment noise is the major ingredient, in addition to man-made noise and industrial noise. Therefore, the analysis and study of Aeolian environment system have great scientific significance and practical value. This paper explores the desert area and regards the terrain, surface and geological conditions, as well as the coupling degree of exploration position and detector, as the impact factors that constitute Aeolian environment system. It assumes random wind sequences as the system input and background noise as the system output. It uses the chaotic Duffing equation to model the Aeolian environment system that is proven with chaotic nature, and it verifies the feasibility of the model. This paper proves that ambient noise in exploration area is mainly caused by the wind, and it supplements our existing understanding of ambient noise and provides reference for analysis of noise properties lately and improving the capabilities of noise cancellation and noise removal technology.This paper will focus on the following three aspects in the entire process of researching. First, it uses an Auto-Regressive-Moving-Average(ARMA) model to simulate the random wind sequence because of unknown random wind sequence of the desert area at the moment of exploration. There is a spectrum fitting between the simulation result and Davenport. As a result, it is used to verify the accuracy of the simulation. If the result is effective, it will be the input of the Aeolian environment system of desert area. Then, this paper analyzes the systematic nature of Aeolian environment so as to build an accurate system model. We do qualitative analysis before quantitative analysis for the system, and then obtain the impulse response of the system by the use of non-parametric model system identification method with impulse response method. The phase diagram has the chaos, which overthrows the prior assumptions and verifies that the system has chaotic characteristics. Finally, the Duffing equation with chaos is used to model the desert area according to the above analysis on the systematic nature. We put the random wind sequence obtained by simulation into the system and contrast the system output signal with background noise from the following three aspects: time-waveform, phase diagram, and spectrum. According to result when different parameters act on this equation and a large number of adjustments and curve fittings from the above three aspects, we can obtain the expected effect of the fitting. The conclusion is that the Aeolian environment system of desert area that we built is feasible and effective.