A method for identifying thin reservoirs with high velocity top

Abstract

The invention provides a method for identifying a thin reservoir on the top of a high-speed layer, belonging to the technical field of petroleum exploration. The method includes: for multiple drilling wells in the exploration area, obtain the effective minimum frequency when the thin reservoir on the high-velocity layer in each drilling well can be identified, combine the effective minimum frequency of each drilling well, and use the interpolation method to obtain the area of ​​the exploration area The effective minimum frequency distribution on the above; obtain the seismic data in the exploration area, and decompose the seismic data into time-frequency to obtain the time-spectrum gather; use the effective minimum frequency distribution to eliminate the low-frequency part of the time-spectrum gather to obtain the high-frequency component of the seismic data The time-frequency spectrum of the high-frequency component of the seismic data is reversely transformed by time-frequency decomposition to obtain the high-frequency component of the seismic data; the amplitude value of the high-frequency component of the seismic data is used to reflect the distribution characteristics of the thin reservoir at the top of the high-speed layer in the exploration area . The invention can not only accurately identify the thin reservoir above the high-speed layer, but also reflect the lateral change characteristics of the thin reservoir.

Description

technical field [0001] The invention relates to a method for identifying thin reservoirs at the top of high-speed layers, belonging to the technical field of petroleum exploration. Background technique [0002] At present, there are mainly two methods for identifying the thin reservoir above the high-speed layer (that is, the thin reservoir on the top of the high-speed layer). Method 1: This method directly uses the seismic amplitude to reflect the thin reservoir on the top of the high-speed layer. The seismic reflection of the seismic data is often submerged in the strong seismic reflection waveform formed by the high-speed layer, so that the seismic amplitude cannot accurately reflect the distribution of thin reservoirs; Method 2: This method is based on the high-frequency components in seismic data and the response of thin reservoirs It is closely related to frequency division signal processing methods (such as Fourier transform, wavelet transform, S transform, etc.) Sei...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying thin reservoirs at the top of high-speed layers to solve the problem that the current thin reservoir prediction methods cannot accurately identify thin reservoirs above high-speed layers

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