Method of recognizing tiny erosion groove in raised region

Abstract

The invention discloses a method of recognizing a tiny erosion groove in a raised region, and belongs to the field of geological engineering. The method includes the steps of selecting a standard well for each of drilled wells inside and outside a large erosion groove in a raised region, and obtaining logging information of the standard wells; establishing interval velocity models for the inside and outside of the large erosion groove respectively according the logging information; combining the logging information and three-dimensional seismic data to obtain an initial synthetic seismogram, and conducting a calibration analysis of the initial synthetic seismogram using the interval velocity models to obtain a final synthetic seismogram; recognizing the top boundary velocity and bottom boundary plane of uncomformity velocity of the inside and outside of the large erosion groove according to the final synthetic seismogram so as to trace seismic reflecting boundary events of the top boundary and bottom boundary plane of uncomformity of the inside and outside of the large erosion groove in the raised region isochronally, and connecting the events of the same time to form a seismic data volume; and slicing the seismic data volume isochronally by using the stratigraphic slice technology and recognizing a tiny erosion groove.

Description

technical field [0001] The invention relates to the field of geological engineering, in particular to a method for identifying micro-eroded grooves in uplift areas. Background technique [0002] Erosion grooves are generally developed in the uplift area (the area where the formation is partially uplifted due to horizontal stress extrusion). Wait. Erosion trenches can be used not only as the main channel for sediment migration, but also as the main place for clastic sediment accumulation. Moreover, based on its geological characteristics, it is easy to form various subtle reservoirs in erosion trenches, such as lens-type lithologic reservoirs, lateral pinch-out lithologic reservoirs, stratigraphic overlapping lithologic reservoirs, fault- Lithological composite oil and gas reservoirs, etc. It can be seen that the research on the erosion grooves in the uplift area is of great significance. Based on this, it is necessary to identify the erosion grooves in the uplift area fir...

AI Technical Summary

Problems solved by technology

[0005] Existing technology can only identify large erosion trenches, but for tiny erosion trenches with a width of several hundred meters (for example, less than or equal to 900 meters) and a depth of about 10 meters to 60 meters, due to the impact of seismic resolution , it does not show obvious above-mentioned features on the seismic profile, making it difficult to be identified by seismic exploration