Fluvial facies sand body discontinuous boundary fine characterization seismic interpretation method

Abstract

The invention relates to a fluvial facies sand body discontinuous boundary fine characterization seismic interpretation method. The method comprises the following steps: 1) according to fluvial facies sand body positive rhythmic deposition characteristics, in combination with demands on property extraction time window by subsequent property analysis, a sand body enveloping method is adopted to interpret construction of a sand body unit; 2) an ant tracking property and a curvature property are extracted on a target reservoir section; 3) the interpreted sand body is used for enveloping an extracted amplitude plane property, a curvature plane property and an ant tracking plane property with top bottom as time window; 4) a curvature plane property and an ant tracking plane property of a seismic profile are taken for comparison and analysis, and thus a sand body discontinuous boundary is judged; 5) vertical slice interpretation is carried out on the amplitude property, the discontinuous boundary caused by vertical overlapping of sand bodies are judged auxiliarily and a sand body deposition period is divided; 6) according to the discontinuous boundary plane judgment result acquired in the fourth step and the vertical sand body period dividing conclusion acquired in the fifth step, building of sedimentary facies recognition is assisted.

Description

technical field [0001] The invention relates to a seismic interpretation method for the fine characterization of discontinuous boundaries of fluvial sand bodies, and belongs to the technical field of oil field development. Background technique [0002] Fluvial facies reservoirs are the main reservoir type of oil and gas resources in the discovered oilfields in my country, and they are also the reservoirs with the most abundant oil and gas. According to statistics, the geological reserves of crude oil in fluvial reservoirs account for more than 40% of the producing geological reserves of my country's developed oilfields. It is lower, about 23%, which means that three-quarters of the geological reserves in the reservoir cannot be effectively recovered. This phenomenon is not only caused by development factors, but also the internal heterogeneity of fluvial reservoirs is the main reason. [0003] The lithology of fluvial facies reservoirs has large vertical and lateral changes...

AI Technical Summary

Problems solved by technology

In addition, short-axis or point-shaped seismic reflection features are also difficult to achieve continuous tracking on the seismic section

Seismic interpretation methods for the study of fluvial sand bodies usually focus on high-resolution seismic inversion and attribute analysis, but so far there has not been a set of seismic interpretation methods specifically for the identification of discontinuous boundaries of fluvial sand bodies

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