Description and evaluation method for spatial distribution of sand bodies, of seismic attribute, in clastic rock reservoir

Abstract

The invention discloses a description and evaluation method for spatial distribution of sand bodies, of a seismic attribute, in a clastic rock reservoir. The method comprises the following steps that 1) batten interpolation and encrypted sampling are carried out on post-stack seismic data to obtain encrypted sampled seismic data; 2) according to sensitive relations between the seismic attribute and lithology, pore permeability and petroliferous performance, a seismic attribute combination is optimized, and an integrated seismic attribute is obtained; 3) spatial distribution of dessert sand bodies is identified according to the integrated seismic attribute; and 4) spatial distribution of dessert sand bodies is combined, and a logging porosity and the petroliferous performance are calibrated to realize identification and integrated evaluation for sand bodies of the clastic rock reservoir. According to the method, features of the seismic attribute data calibrated by the logging data are considered in an integrated manner, technologies of logging data calibration, batten interpolation and encrypted sampling of seismic data, seismic attribute extraction and analysis on slicing zero points of the attribute are applied comprehensively, the thickness and physical parameters of the sand bodies of the seismic attribute are evaluated, and the prediction and evaluation precision of the sand bodies of the reservoir are improved.

Description

Technical field [0001] The invention belongs to the field of petroleum geological exploration, and specifically relates to a method for describing and evaluating the spatial distribution of seismic attribute sand bodies in clastic rock reservoirs. Background technique [0002] In the oil and gas exploration and development of clastic rock reservoirs, the description and quantitative evaluation of the spatial distribution of sand bodies are very important. In particular, the current oil and gas exploration has shifted from traditional structural, especially reservoirs, to subtle tight lithologic reservoirs, which is important for oil and gas reservoirs. The identification and description accuracy of layered sand bodies is becoming higher and higher, which can only be achieved with the help of high-precision three-dimensional seismic data. Since the agreement, the application of seismic attributes is mainly based on qualitative description and analysis, and the distribution descrip...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for describing and evaluating the spatial distribution of seismic attribute sand bodies in clastic rock reservoirs, so as to solve the problem of low prediction accuracy of existing seismic attribute interpretation methods, especially the poor identification of thin interbedded sand bodies

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