Reservoir pinch line description method based on time-frequency domain information

Abstract

The invention provides a reservoir pinching line description method based on time-frequency domain information. The method comprises the steps of carrying out the seismic horizon interpretation tracking of a target layer, and building an isochronous stratigraphic sequence body; performing Wheeler domain conversion on the isochronous stratigraphic sequence body to obtain a relative age body by using a seismic stratigraphic principle; establishing a speed model of the relative age body by using the isochronous stratigraphic sequence body; performing quantitative description on the stratum thickness of each sedimentary stratum in the relative age body by using a velocity model; carrying out statistics on the stratum thickness and the reservoir thickness of the actually-drilled well of each sedimentary layer in the relative age body by utilizing geostatistics, and fitting a mathematical function relationship between the stratum thickness and the reservoir thickness; and converting the stratum thickness of each sedimentary layer in the relative age body by using the obtained mathematical function relationship to realize the quantitative description of the reservoir of each sedimentary layer, and determining the accurate position of the reservoir pinching line. The reservoir pinching line description method based on the time-frequency domain information is objective and reliable, and the accurate position of the reservoir pinching line at the front end of the delta front product can be determined.

Description

technical field [0001] The invention relates to the technical field of exploration geophysical exploration, in particular to a reservoir pinch-out line description method based on time-frequency domain information. Background technique [0002] The thin-bed sand body reservoir at the end of the foreset of the delta front has become a new exploration target. The thickness of the sedimentary end of this type of sedimentary body is stable, the seismic reflection continuity is good, and the stratigraphic description can be better. However, due to the internal reservoir The layer is thin and does not contribute much to the seismic reflection intensity, so it is difficult to identify the pinch-out position of the reservoir from the seismic reflection axis. There are two commonly used prediction methods for thin layers: one is inversion prediction based on well shocks. This method has achieved good application results in formations with large single-layer sand bodies and stable la...

AI Technical Summary

Problems solved by technology

[0002] The thin-bed sand body reservoir at the end of the foreset of the delta front has become a new exploration target. The thickness of the sedimentary end of this type of sedimentary body is stable, the seismic reflection continuity is good, and the stratigraphic description can be better. However, due to the internal reservoir The layer is thin and does not contribute much to the seismic reflection intensity, so it is difficult to identify the pinch-out position of the reservoir from the seismic reflection axis

This method is better for predicting the pinch-out line of reservoirs with large single-layer sand body thickness and abrupt depositional environment, but not suitable for reservoirs with relatively stable depositional environment and very thin reservoir thickness.

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