Fast interpretation method for unconformity stratigraphic position

Abstract

The invention provides a fast interpretation method for the unconformity stratigraphic position. The fast interpretation method for the unconformity stratigraphic position comprises the steps that 1, a drilled well is subjected to single well refined sand layer group division; 2, refined synthetic record calibration is conducted; 3, the time gradient controlled by a standard layer is obtained; 4, the variable time difference is fitted through calculation of a variable time window algorithm; and 5, automatic interpretation of an unconformity stratum is conducted. According to the fast interpretation method for the unconformity stratigraphic position, the unconformity stratum is automatically tracked through calculation and fitting of the variable time window controlled by the standard layer, the unconformity stratum interpreted through the method is more objective and accurate in result, the working efficiency is effectively improved, and interpretation errors are reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a quick interpretation method for unconformable stratum layers. Background technique [0002] With the in-depth exploration of subtle oil and gas reservoirs, the degree of exploration is getting higher and higher, and the exploration is becoming more and more refined. The position of stratigraphic oil reservoirs in exploration is becoming more and more important. It is much more difficult to discover stratigraphic unconformity traps than structural oil and gas reservoirs due to the characteristics of diverse formation conditions and configuration relationships, irregular shapes, concealment of burial and distribution, or extreme complexity of reservoirs. The typical characteristic of stratigraphic traps is that the reservoir gradually converges toward the unconformity surface. Using conventional ground constant time window analysis will cause time-travel or leakage o...

AI Technical Summary

Problems solved by technology

[0003] The difficulty in stratigraphic reservoir description lies in the accurate description of superstripping lines and the geophysical description of reservoir sand bodies, and the key problem restricting the geophysical description of reservoir sand bodies is the fast and accurate interpretation of unconformity layers. Horizontal interpretation technology has great disadvantages. Therefore, in actual work, fixed time window control is used for geophysical description. However, the actual unconformity strata do converge and change. Using fixed time window analysis will inevitably lead to reservoir Layer description is a time-travel or missing problem, resulting in inaccurate description

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