Method for reservoir prediction by utilizing thickness of seismic wave group

Abstract

The invention provides a method for reservoir prediction by utilizing the thickness of a seismic wave group. The method for reservoir prediction by utilizing the thickness of the seismic wave group comprises: performing a multi-well synthetic record calibration; through a sand-removing experiment, determining reflection characters of the seismic wave group corresponding to a sandstone reservoir; selecting corresponding wave group top and bottom interfaces to perform tracking description and forming depth subtraction data volume of the seismic wave group top and bottom interfaces; enabling the depth subtraction data volume to be encrypted with contour lines to form a map and a seismic wave group thickness contour map is formed; performing unary regression analysis by combining the well drilling thickness and the thickness of the seismic wave group; and based on the unary regression analysis, converting the seismic wave group thickness contour map into a reservoir prediction contour map. The method for reservoir prediction by utilizing the thickness of the seismic wave group helps to change the conventional description method of single sand bodies; the prediction results can better reflect the distribution rules of regions where the plurality of single sand bodies are vertically superposed and transversely superposed into a continuous section so that general evaluation and disposition are enforced conveniently in exploration and development.

Description

technical field [0001] The invention relates to the fields of petroleum and natural gas geology and exploration and development engineering, in particular to a method for predicting reservoirs by using the thickness of seismic wave groups. Background technique [0002] Reservoir prediction using 3D seismic data has always been a very important evaluation content in the field of oil and gas exploration and development, and the technical methods of reservoir prediction have also diversified accordingly. According to the principle of seismic wave reflection, the reflection axis position of seismic section is usually the result of convolution of multiple wave impedance interfaces. The method of reservoir prediction based on conventional tracing and description of seismic reflection axis position is mainly applicable to the area where the single sand body is thick and the surrounding rock is mainly thick mudstone. At present, reservoir prediction mostly adopts the method of seis...

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Problems solved by technology

At present, reservoir prediction mostly adopts the method of seismic inversion under logging constraints, such as the "Reservoir Prediction Method for Multi-well Logging Parameter Inversion under Relative Wave Impedance Constraints" in the application number CN200910138386.1, but this method It still has poor adaptability to areas where multi-layer rock masses are vertically superimposed and horizontally connected

In addition, the use of neural networks for reservoir prediction, such as the "Double Neural Network Reservoir Prediction Method" in the application number CN02152379.7, involves strong professionalism and high equipment requirements, and is difficult to popularize and apply

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