Geographic Information System (GIS) results from the development of information technology and information industry,and is a science and technology that develops rapidly in recent years.It has been used in the whole field with respect to spatial information.With the development of the information technology,GIS will gradually trend to WebGIS,ComGIS,OpenGIS,Temporal GIS,Virtual GIS,3D GIS and 3S Integration.In geology field,GIS is broadly used in some fields such as map-plotting,geological disaster-forecasting,management of petroleum exploring data and forecasting and assessment of mineral resources and so on.The development of GIS technology makes the application of GIS in geology further and broader,but because of the indelibility of expert knowledge,the expert system need to be considered on the basis of GIS development,which is the development direction of geology field.

In VSP forward modeling with the wave field extrapolation method,we can just simulate upward wave or simulate upward wave and downward wave simultaneously according to the situation,and the multiple wave can be controlled efficiently.In general,under the condition of being only concerned with the primary reflection,we needn't simulate the multiple wave.This method has high efficiency compared with other wave equation modeling methods.In this paper,the split-step Fourier method was used to extrapolate the wave field,which can guarantee the stability of wave extrapolation and the modeling accuracy for the complex model.Model test shows that this method can simulate VSP efficiently and the modeling result is correct and reliable.

In the existing methods of random summing of total resource,the shape of the total resource curve sometimes distributes skewly,in view of which,the new method was put forward to improve random sampling.The entrance of the random sampling was not defined in the interval of(0,1),but in the interval of(0,ki),where ki is the insurance index of the petroleum resource of the ith local geological location.The random numbers distributing in the interval(0,ki) were used to make a random sampling to the resource distribution function through the risk analysis.The improved method overcomes the flaw of the traditional sampling method,realizes the even distribution random sampling and makes the total resource tend to normal distribution.