Thin mutual reservoir description method taking reconstructed sand-to-ground ratio as seismic description target

Abstract

The invention provides a thin mutual reservoir description method taking a reconstructed sand-to-ground ratio as a seismic description target. The method comprises steps of S1, explaining fine seismicstructures of top and bottom surfaces of a sand layer group; S2, generating a plurality of seismic attribute bodies by applying seismic means; S3, analyzing the correlation between the various seismic attributes and a sand-to-ground ratio and a net-to-gross ratio, determining whether the correlation has zoning or not, and selecting the seismic attributes with high correlation in zones for subsequent research; S4, respectively reconstructing the sand-to-ground ratio according to the zones in the S3, calculating the correlation between the reconstructed sand-to-ground ratio and the net-to-grossratio and the optimal seismic attributes, and giving a linear formula; S5, making an optimized seismic attribute planar graph, and converting the seismic attribute planar graph into a reconstructed sand-to-ground ratio or net-to-gross ratio planar distribution graph by utilizing the formula in the S4; and S6, deriving a sand-to-ground ratio and net-to-gross ratio planar graph by utilizing the reconstructed sand-to-ground ratio and net-to-gross ratio planar graph. The method is advantaged in that the reconstructed sand-to-ground ratio is utilized as the seismic description target, so the reconstructed sand-to-ground ratio and the seismic attributes have high similarity, the distribution rule of a thin mutual reservoir is effectively described, and the rule can effectively guide explorationand development practices.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas industry, in particular to a method for describing thin interbedded reservoirs with reconstructed sand-ground ratio as the seismic description target. Background technique [0002] Thin interbedded reservoirs have the characteristics of thin single layer, thin mudstone interlayer (the thickness of single layer is smaller than the seismic time and waveform can be distinguished), and the distribution of reservoirs is characterized by long intervals. In the Shengli Oilfield, a variety of sedimentary types will show the characteristics of thin inter-reservoirs, such as beach bar sand, turbidite, etc. These reservoirs are currently low in development and widely distributed, which is the basis for increasing reserves and production in the Shengli Oilfield in the future. important position. At present, the emerging reservoir description methods are mostly based on seismic methods, such as seismi...

AI Technical Summary

Problems solved by technology

The two relevant literatures retrieved above both regard the sand-to-ground ratio as the target of seismic description, and the sand-to-ground ratio only reflects the thickness attribute in the vertical direction of the reservoir, without lithology information, and whether the seismic attributes are single or combined, Not only the volume attribute but also the lithology attribute are contained in it, and the two attributes cannot be separated. Therefore, it is not enough to seek the correlation between the two and only start from the seismic aspect. It is necessary to reconstruct the sand-ground ratio. It is a feasible method to seek the high correlation between the two

Images