Analysis method for improving reservoir prediction precision through seismic waveform envelope interpretation

Abstract

The invention provides an analysis method for improving reservoir prediction precision through seismic waveform envelope interpretation, and the method comprises the following steps: 1), calibrating aseismic waveform main lobe corresponding to a research target interval on a seismic reflection waveform profile through fine synthesis seismic record calibration and seismic phase 90-degree conversion through seismic data interpretation software; 2) defining an interpretation horizon top layer and an interpretation bottom layer, and respectively carrying out horizon tracking interpretation alongthe top and bottom of a seismic waveform main lobe corresponding to a target layer at an interpretation density of 2 * 2; 3) interpreting a time window between the top layer and the bottom layer of the horizon as a seismic waveform attribute extraction time window, and determining the time window as a non-isochronous optimal window for waveform seismic attribute extraction analysis; and 4) performing seismic waveform arc length, skewness and torsion extraction analysis in the time window in the non-isochronous optimal window, drawing an attribute plane graph, and performing reservoir prediction. According to the invention the prediction precision is higher and is closer to geological reality reflected by an actual target interval, and a better basic geological basis can be provided for oilexploration decision making.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to an analysis method for improving the accuracy of reservoir prediction by seismic waveform envelope interpretation. Background technique [0002] Reservoir prediction using seismic waveform attribute extraction is widely used in petroleum exploration and development. The basic principle of seismic stratigraphy assumes that the reflected wave event on the seismic section has the significance of the geological time boundary. The attribute analysis time window must be given for reservoir prediction using seismic waveform attributes. The conventional attribute analysis time window is determined as follows. First, trace and interpret a seismic horizon along the seismic waveform peak event, and then drift upward and downward along the layer For a certain period of time, use this time window to analyze the seismic waveform attributes. However, the seismic waveform informa...

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Problems solved by technology

However, the seismic waveform information in the time window cannot truly reflect the real information of our research target layer, and often contains the seismic waveform information of non-target layers, or the seismic waveform information of the target layer is not included in the analysis time because of the inappropriate definition of the time window. In the window, the accuracy of reservoir prediction using seismic waveform attributes is affected; and the "isochronous window" generated by isochronous drift along the layer is used for seismic waveform attribute prediction, the setting of the analysis time window is not accurate, and the analysis window contains non-target layer earthquakes Waveform property information

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