Study On Method Of Logging Evaluating Igneous Fracture By STFT

With the rapid developm ent of the global econom y,there is also in creasing demand for energy. In this situation,oil and gas exploration and development are put forward higher requirements,and as a kind of special oil and gas reservoirs,igneous rock oil and gas reservoirs are attracting wide attention from scholars at hom e and abroad. As we all know,igneous reservoir has always been a “there is no oil and gas reservoir without fracture in the igneous rock ” argument,And in the igneous rock reservoir,cracks are distributed in hard s trata with high resistivity bedrock,it is storage space,and is also connected storage channel,so fracture network has decisive significance for oil and gas output. The exis tence of cracks can allow the isola ted holes to be connected,and developed into an ef fective storage space,At the same time,the development of the fracture is beneficial to the secondary transformation of the reservoir,so the correct prediction and identification of igneous rock fractures are the key to the exploration and development of igneous reservoirs.In this paper, based on the the ory of short-time Fourier transform and conventional logging data and imaging logging data,the fracture of igneous rock is studied from three aspects.(1) In this paper,using the short-time Fourier transform theory,we select the curve of the logging response of the fracture to STFT transform,and establish the analysis method of the STFT of the conventional logging curve,and then evaluate the development of the fracture.(2) Used the conventional logging data,the fracture parameters are quantitatively evaluation,such as calculation of crack inclination and porosity parameters.(3) Based on the im aging logging data,the fracture parameters of the imaging logging data were extracted by CIFLog,and the developm ent of the fracture was evaluated by the method of STFT crack analysis.In this paper, the actual well logging data of Liaohe oil field is processed,the short-time Fourier transform method is used to predic t the fracture section of the well, and the quantitative ca lculation of fracture parameters is m ade by using conventional well logging data,at the same time,combined with the imaging logging data,the fracture param eters of the im aging logging data are extracted,and the comprehensive evaluation of the volcanic ro ck fracture is carried out by the comprehensive evaluation,and some achievements are obtained.