Method and device for predicting thin reservoir in lacustrine facies beach bar sand bodies

Abstract

The invention discloses a method and a device for predicting a thin reservoir in lacustrine facies beach bar sand bodies. The method comprises the steps of: respectively dividing strata sequence levels of different single wells according to historical data and logging data in a target region; comparing the sand bodies of different single wells at the same strata sequence level to obtain a sand body comparison result; preprocessing and standardizing logging curves of the single wells, and screening an inversion sample curve from the logging curves according to lithologic data of the logging curve; performing band-pass filtering on the seismic data according to the sand body comparison result to obtain seismic reflection data of the thin reservoir; carrying out waveform phase-controlled random inversion according to the inversion sample curve, a sound wave curve and a density curve in the seismic data and the thin reservoir seismic reflection data, and acquiring a thin reservoir inversion result; and determining the position of the thin reservoir according to the thin reservoir inversion result. By adopting the method, the prediction precision of the thin reservoir in the lacustrinefacies beach bar sand bodies can be improved.

Description

technical field [0001] The present application relates to the technical field of geological exploration, in particular to a thin reservoir seismic prediction method and device. Background technique [0002] Lacustrine beach-bar sand bodies are developed in a specific sedimentary environment and are adjacent to hydrocarbon-generating centers. The lithological combination characteristics of more mud and less sand and high-quality storage performance make beach-bar sand bodies easy to develop lithologic reservoirs, thus becoming the current oil and gas exploration. Hot areas. However, the beach bar reservoir has the characteristics of thin sand body thickness, rapid lateral change, and interlayering of sand and mud, so the prediction of thin beach bar sand body reservoir has become a worldwide problem in the field of petroleum geology. [0003] Predecessors have explored a series of thin reservoir prediction methods by using advanced technologies such as log-constrained wave i...

AI Technical Summary

Problems solved by technology

Geostatistical inversion uses lithological indication simulation and sequential Gaussian simulation technology to improve the inversion resolution, but it is difficult to fit a good variogram model for the sample points, and the interpolated high-frequency components differ greatly from the actual geological phenomena. Low applicability of performance results

The waveform phase-controlled inversion method is a high-precision inversion method that uses the similarity of seismic waveforms to establish a constrained initial model. The inversion resolution reaches λ / 8 wavelength. Unable to meet the requirements of exploration accuracy

[0005] It can be seen that the current exploration methods cannot meet the high-precision prediction requirements of lacustrine beach-bar thin reservoirs, and there is still a lack of a direct and effective method to predict lacustrine beaches with thin thickness, rapid lateral changes, and sand-mud interlayers. Thin reservoirs in bar sand bodies

Images