The Study On Seismic Attribute And Its Application To Oil & Gas Exploration In Sangtamu Area

This dissertation first summarizes the development of seismic attribute. The theoretical basis of seismic attribute is systematically discussed. Then, the paper compares some kinds of analytical method of seismic attribute and analyzes the factors that influence the effect of prediction. These studies are used to guide the application, which develop the theory itself while meeting the need of oilfield exploration & development. On the basis of these studies, the method of seismic attribute is applied to the exploration of carbonatite in buried hill in in Sangtamu area, Talimu Basin. We use the seismic facies waveform analysis, seismic mutil-attributes cross analysis and the lateral difference of local amplitude to predict the potential exploring objectives in the area. At last, we provide six exploring wells. Among the drilled three wells, the two gain the industrial oil & gas and another is not good.As follows are the main studies.(1)Based on the characteristics of carbonatite reservoir in Sangtamu area, we summarize the type of seismic reflection and the distribution of oil and gas.(2)Through the study of the lateral difference of local amplitude, which can predict the short, unorderly reflective energy gobbet of carbonatite reservior, we study the distribution of carbonatite reservoir with crack.(3)Analyzing the change of the seismic waveform, applying nerve network method to classify the seismic waveform, find the rule of its change, recognizing the change rule of seismic facies.(4)Applying the seismic multi-attribute cross method to study the surface and inner of carbonatite reservoir in buried hill. We first extract the 5 kinds of seismic attribute. Through a series of choices, we find those seismic attributes that are sensitive to the change of carbonatite reservoir. Accompanying the geological study and the information of the wells, we analyze the characteristics of clustering of the choice seismic attributes to relate to the change of the carbonatite reservoir. Modifying the values of the clustering to fit to the result of wells, predict the potential oil and gas of carbonatite reservoir in Sangtamu area.All in all, the dissertation applies the theory of seismic attribute to guide the practical application, at the same time, developing the study of theory in practice. Closely connecting the theory of seismic attribute with its application, we study the method to fit to the exploration of carbonatite reservoir in Sangtamu area. The result demonstrates the method of seismic attribute is an effective tool to study carbonatite reservoir.