Wave Impedance Of The Study And Application Of Genetic Algorithm Methods

AbstractFor fine oil-gas exploring, the result of seismic .wave imPedance inversion is.more imPortan on oil accumulation describing and oil-gas crosswise forecasting andso on. Seismic wave impedance can ttuly reflect underground geology strucat androck nat'Ure, and imProve the successful rate of drilling. Seismic wave imPedance...inversion itself belong to the nonlinear question of more parameters, and Geneticalgorithrn (GA) is just a nonlinear optimal method of more parameter beingdeveloped recently While fully absorbing and digesting research achievements ofdomestic and 3broad scholars about nonlinear optimization technique, and the paPercombines stimulated annaling to inverse seismic wave imPedance in the jrocess ofstUdying to GA, and to get as follows some achievemenis.(l) Takes quinary system coding instead of binary system coding. In codingnumber of bits being alike, the search space of quinary system real nUmer is biggerthan that ofbinny System, and can seek global oPtical result easily(2) Take a bit by a bit iteration exchanging instead of ordinary hybrid Way this isthat Wmly choosing hybrid point go on exchanging. The most advanage ofexchanging Way of a bit by a bit iteration is tha has bigger search sPace than ordinaryhybrid H and is available for a oPtical result.(3) If going on clear select for requesting question, genetic algorithm will behave more efficiency, fOr this pmpose, we may realize by heat-bath method ofstimulated annaling producing new result. This specific practice adoPts Probabilitydistributed funtion, and randomly produces a nUIner of candidate value of theparaxneter variable, and then we may randomly orgedze initial State of everyindividual in colony after every pararneter being picked uP, so that individual initialvalue has strong focus and the search of genetic algorithIn has poweffol effect.(4) For overcoming cheated problem of genetic algorithm, the paPer introduce2Boltzmann subsist mechanism in genetic operating so that bad result of genetic algorithm also can be accepted, and keep useful kinds nature of colony. The useful kinds nature refers to the individual of colony representing the space region (zone) of different part optical result.The paper has done a great deal of theoretical modeling test and real data processing, especially make the calculation of wave impedance inversion for seismic stack data applying the new genetic algorithm in Nanhai region. It proves the effect and practicability of the paper抯 methods.