Method for frequency domain anomaly analysis of underground medium in work area

Abstract

The invention discloses a method for analyzing the frequency domain anomaly of the underground medium in the work area. The method for analyzing the frequency domain anomaly of the underground medium in the work area is characterized in that it includes the following steps: through the petrophysical analysis of the logging data, the sandstone of the underground medium in the work area is distinguished Stratum and mudstone formation; through the time-frequency analysis algorithm, the frequency information data of the seismic data in the sandstone formation and mudstone formation of the work area are obtained; through the seismic wave attenuation feature extraction technology, the attenuation feature extraction is performed on the frequency information data, and the seismic data in the sandstone formation is obtained. and the frequency attenuation characteristic parameters of the mudstone formation; use the least square method to perform linear fitting or polynomial fitting on the attenuation characteristic parameters to obtain the attenuation trend line of the sandstone formation and the attenuation trend line of the mudstone formation; the attenuation trend line of the sandstone formation is the main , with the attenuation trend line of the mudstone formation as an attachment, the difference of the attenuation trend of the seismic data in the sandstone formation and the mudstone formation is analyzed.

Description

technical field [0001] The invention relates to the technical field of offshore oilfield engineering, in particular to a method for analyzing anomalies in the frequency domain of underground media in a work area. Background technique [0002] As power energy, oil and natural gas control the development of the national economy and the lifeline of national strategy. The independent exploration and development of oil and natural gas is an important pillar for maintaining national stability and international competitiveness. Accurately predicting reservoirs and reservoir oil-gas properties is particularly important in oil and gas development. Since the last century, the technology of using geophysical exploration methods to find oil and gas reservoirs has been developed and applied. In this century, as simple structural oil and gas reservoirs have been basically explored, complex lithology fractured oil and gas reservoirs are the current oil and gas exploration. The main goal, ...

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