Method and system for predicting sand shale reservoir with few well areas and multiple sedimentary facies zones

By preprocessing and lithological sensitivity analysis of seismic exploration data, and combining pseudo-well and actual drilling data for modeling, a low-frequency model was constructed and the inversion results were optimized. This solved the problem of low prediction accuracy of sandstone and mudstone reservoirs in areas with few wells, and achieved high-precision prediction of sandstone and mudstone reservoirs.

CN122151200APending Publication Date: 2026-06-05CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
0 Cites 0 Cited by

Patent Information

Application Number
CN202610335692.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-19
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In areas with few wells, existing technologies struggle to effectively utilize seismic attribute information to construct low-frequency models that adapt to the characteristics of multiple sedimentary facies zones, leading to a decrease in the accuracy of sandstone and mudstone reservoir predictions. This is particularly true in areas with dramatic changes in sedimentary facies zones, where the predicted results deviate significantly from the actual geological conditions.

Method used

By preprocessing seismic exploration data, extracting seismic attribute volumes and performing lithological sensitivity analysis, constructing core attribute volumes, and combining pseudo-well and actual drilling data to build a low-frequency model, and optimizing the inversion results through iterative inversion, high-precision prediction of sandstone and mudstone reservoirs can be achieved.

Benefits of technology

It significantly improves the accuracy of sandstone and mudstone reservoir prediction, effectively reflects the lateral variation of sedimentary facies zones under conditions with few wells, and provides reliable geological evidence to support oil and gas exploration and development.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to the field of petroleum and natural gas exploration, and provides a few-well-area multi-sedimentary-facies-belt sand shale reservoir prediction method and system.The method comprises the steps that seismic exploration data of a research area is preprocessed, seismic attribute bodies are extracted in combination with sedimentary facies-belt lithology differences, the seismic attribute bodies are screened through lithology sensitivity analysis, and a reservoir is obtained; obtaining a core attribute body; taking the core attribute volume as a constraint condition, and performing primary inversion on the preprocessed seismic exploration data through an inversion algorithm to obtain a primary inversion data volume; constructing a pseudo well according to the primary inversion data body and sedimentary facies belt characteristics, and performing joint modeling on the pseudo well and real drilling well logging data to obtain a low-frequency model; and carrying out iterative inversion by taking the low-frequency model as a constraint condition, and carrying out sand shale reservoir prediction on an iterative inversion result to obtain a whole-region sand shale reservoir prediction result. According to the method, the adaptability of multiple sedimentary facies belts is improved.
Need to check novelty before this filing date? Find Prior Art