Method and device for identifying undercut valley in marine carbonate rock stratum

Abstract

The invention discloses a method and a device for identifying an undercut valley in a marine carbonate rock stratum. The method comprises the steps of: determining whether a sedimentary environment of a target region is a marine carbonate rock sedimentary environment or not according to the geological data of the target region; when determining that the sedimentary environment of the target region is the marine carbonate sedimentary environment, analyzing seismic attribute body slices of a target stratum of the target region, and identifying a long-strip-shaped geological anomalous body with a preset difference feature type; selecting a coring well in the long-strip-shaped geological anomalous body for rock core and slice observation to obtain an observation processing result; performing logging curve analysis on the non-coring well in the long-strip-shaped geological anomalous body to obtain a logging curve analysis result; and identifying the undercut valley in the marine carbonate rock stratum according to the observation processing result and the logging curve analysis result. The method and the device realize the effects that the sedimentary geology, logging and earthquake are comprehensively utilized, the undercut valley deposition in the marine carbonate rock stratum is accurately identified, and powerful support is provided for oil field exploration and development.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and a device for identifying incised valleys in marine carbonate formations. Background technique [0002] This section is intended to provide a background or context to embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Incised valley is an important term in sequence stratigraphy. It refers to the erosion canyon formed by the channel extending to the basin and eroding the early shelf during sea level drop. During sea level rise, the canyon is filled and the incised valley is filled with sedimentary formation The lowstand wedge of the lowstand systems tract. [0004] In modern sediments, the incised valleys are easy to identify due to the differences in landforms ( figure 1 ), but in ancient strata, it is difficult to identify because the incised va...

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Problems solved by technology

[0004] In modern sediments, the incised valleys are easy to identify due to the differences in landforms ( figure 1 ), but in ancient strata, it is difficult to identify because the incised valleys are mostly filled

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