A Method for Reservoir Prediction Using Seismic Energy Difference Attributes

Abstract

A method for predicting reservoirs using seismic energy difference attributes, extracting amplitude envelope volume and instantaneous phase cosine volume attributes within a time window to generate amplitude envelope data volume R, cosine data volume I, envelope data The abscissa of the amplitude spectrum of the volume R is the frequency, and the ordinate is the amplitude, showing a curve that the amplitude decreases with the increase of the frequency. The abscissa corresponding to the mutation point is the threshold frequency f of the high frequency band and the low frequency band, and the high-pass filter generates the envelope data volume R The high-pass filtering data volume H of the high-pass filtering data volume H is assigned with a negative value, and the positive value remains unchanged to obtain the high-pass filtering positive value data volume H', which is multiplied by the cosine data volume I to generate the energy difference attribute data volume N, which is matched according to the time and depth of the well shock , to complete the horizon tracking of the top and bottom of the target interval reservoir or other geological bodies in the exploration area, extract the root mean square amplitude of the data body N with the interval of the top boundary and bottom boundary of the reservoir, and obtain the predicted reservoir layer distribution. The invention can eliminate weaker earthquake amplitudes and retain strong earthquake amplitudes.

Description

technical field [0001] The invention relates to a geophysical prospecting method, which is a method for predicting reservoirs by using seismic energy difference attributes. Background technique [0002] With the continuous advancement of 3D seismic exploration technology and the continuous deepening of the application of 3D seismic data in the field of oilfield exploration and development, the importance of seismic attribute interpretation is increasing. Seismic attributes mainly include time, amplitude, frequency, phase, coherence and attenuation. . In the field of oilfield exploration and development, seismic attributes are mainly used in the prediction of parameters such as reservoir thickness, porosity, permeability, etc., and single seismic attributes such as amplitude and frequency of seismic data are widely used. Among them, the use of amplitude attributes to predict reservoir is the most common method, favored by seismic interpreters because of its simplicity. Howe...

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Problems solved by technology

However, there are still some problems with the conventional amplitude attributes. On the one hand, the resolution of the amplitude attributes is generally low, and the phase factor is not considered; The difference between the amplitudes can be determined by repeated color calibration, and the human interference factor is too strong; in addition, the influence of lithology, oil and gas and other factors make the seismic responses of formations with different physical properties similar, and conventional amplitude attributes cannot It is well distinguished, so the current amplitude attributes often cannot meet the needs of exploration and development

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