Description method of reservoir sand bodies on ultra-deep coal layer

Abstract

The invention discloses a description method of reservoir sand bodies on an ultra-deep coal layer. The method comprises the following steps of: firstly, analyzing waveform characteristics of erosional truncation type pinchout points and coal layer characteristics by means of forward modeling of different models, and providing bases for boundary determination of practical data sand bodies and coal layer stripping; utilizing overlying strata low trough attribute extreme points to identify pinchout lines of the sand bodies; utilizing a multichannel dynamic matching tracking method under the control of layer positions to carry out coal layer high-shielding stripping, and highlighting reservoir weak signals; on the basis of coal layer high-shielding stripping, utilizing a relatively-high time frequency resolution in GST to carrying out frequency division and reconstruction on frequency spectrum components of main information of the reservoir in a time frequency domain, wherein the processed data can predict the sand bodies more accurately; and finally, according to GR pseudo-acoustic impedance inversion, obtaining three-dimensional wave impedance data bodies for comprehensive analysis, and obtaining a reservoir prediction result. By adopting the method provided by the invention, the pinchout lines of the sand bodies are effectively described, the range of the sand bodies of the ultra-deep reservoir is precisely predicted, and the precision of seismic reservoir prediction is greatly improved.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation, and in particular relates to a method for depicting and describing the sand body of an ultra-deep coal upper reservoir. Background technique [0002] Affected by multiple sets of coal seam interbeds, the seismic reflection energy of the target layer is covered by the coal seam; the target layer of seismic data is denuded, and the block contains multiple sets of sand groups, and different sand groups are superimposed in the vertical direction, increasing The difficulty of delineating the boundary of sand bodies is difficult; ultra-deep reservoirs are generally low-porosity and low-permeability tight reservoirs, and the reservoirs have strong lateral heterogeneity. big uncertainty problem. Therefore, how to choose a reasonable reservoir description method is very important for finely describing coal-bearing ultra-deep reservoirs. Contents of the invention [0003] The purpose of the p...

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Problems solved by technology

[0002] Affected by multiple sets of coal seam interbeds, the seismic reflection energy of the target layer is covered by the coal seam; the target layer of seismic data is denuded, and the block contains multiple sets of sand groups, and different sand groups are superimposed in the vertical direction, increasing The difficulty of delineating the boundary of sand bodies is difficult; ultra-deep reservoirs are generally low-porosity and low-permeability tight reservoirs, and the reservoirs have strong lateral heterogeneity. big uncertainty problem

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