Comprehensive Evaluation Of The Distribution Of The Dessert In The Tight Sandstone Reservoir

This paper briefly analyzes the present development situations and problems about the dessert of tight sandstone reservoir.The research ideas are as follows: First,this paper discusses the dessert's distribution of the tight sandstone reservoir as the research object in Yanchang formation which located at Zhenjing oilfield.Then seismic logging and geological data are utilized to establish distribution of dessert in tight sandstone.Second,by analyzing logging data,this paper summarizes logging response characteristics of tight sandstone reservoir.The wavelet multi-scale decomposition is applied to process the imaging data and evaluate the fracture development in a semi-quantitative way.Based on the conventional log data,the cracks-probability model is established to evaluate the fracture development combined with the imaging data.This paper uses principal component analysis method to determine the weight coefficient.Third,under the condition of the logging data of calibration,the 3-d seismic data is interpreted accurately.By extracting the seismic attributes and optimizing the RMS amplitude,the distribution of sand body thickness is predicted combined with the logging data.This paper also predicts the distribution of fracture development zone by using attribute of coherent data volume.Combining the seismic attribute analysis with fracture development logging evaluation method,this paper locates the distribution of the dessert reservoir.A comprehensive evaluation method of evaluating dessert reservoir in tight sandstone area is obtained by utilizing the advantage of vertical resolution of logging data and lateral resolution of seismic data effectively.It can provide reference to other similar areas.