Identification method for thin reservoir on top of high-speed layer

Abstract

The invention provides an identification method for a thin reservoir on the top of a high-speed layer, and belongs to the technical field of oil exploration. The method comprises the steps as follows:for multiple drilling wells in an exploration area, the effective lowest frequency when a thin reservoir on a high-speed layer in each drilling well can be recognized is obtained, and the effective lowest frequency distribution in the exploration area is obtained through interpolation according to the effective lowest frequency of each drilling well; seismic data of the exploration area is acquired, and time-frequency decomposition is performed on the seismic data to obtain a time-frequency spectrum gather; a low-frequency part in the time-frequency spectrum gather is eliminated by utilizingthe effective lowest frequency distribution to obtain a time-frequency spectrum of a high-frequency component of the seismic data; inverse transformation of time-frequency decomposition is carried outon the time-frequency spectrum of the high-frequency component of the seismic data to obtain the high-frequency component of the seismic data; and the distribution characteristics of the thin reservoir on the high-speed layer are reflected by using the amplitude value in the high-frequency component of the seismic data. According to the invention, a thin reservoir on a high-speed layer can be accurately identified, and the transverse change characteristics of the thin reservoir can be reflected.

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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