📚 Eksplorasi & Komparasi Topik Dokumen

ESTIMASI KONEKTIVITAS ANTARSUMUR PADA RESERVOAR INJEKSI AIR MENGGUNAKAN TRANSFORMASI WAVELET SILANG: PENGEMBANGAN DAN VALIDASI WAVEITB

Most of the world’s producing oil comes from mature fields where waterflooding is essential, yet identifying fluid pathways remains a challenge. Current surveillance methods face significant limitations. Full numerical reservoir simulation is labor-intensive and computationally expensive, while capacitanceresistance modeling often fails to account for dynamic, non-stationary field conditions. This study addresses these gaps by proposing a signal processing approach to evaluate dynamic interwell connectivity in waterflooded reservoirs. The study details the construction and validation of WaveITB, a desktop application built upon the cross-wavelet transform (CrWT) methodology. The study translates injection and production rate histories into a time-frequency domain using a complex Morlet wavelet. The methodology evaluates cross-wavelet coherence, quantifies phase lag to determine signal directionality, and strictly screens spurious coherence using Monte Carlo red-noise significance testing alongside cone of influence (COI) masking. The application was validated through three case studies. It successfully replicated a published benchmark, demonstrating multiscale capabilities. In a structural sensitivity test, the connectivity index for the well isolated by a sealing fault collapsed by approximately four-fifths when compared to the unhindered well in the same scenario, whereas the index remained robust across a non-sealing fault, matching simulated streamlines. When compared to a capacitance-resistance model (CRM), WaveITB identified identical flow barriers but yielded a low Spearman rank correlation of 0.316, confirming it distinctly measures dynamic signal communication rather than partitioning volumes under mass-balance constraints. The study concludes that the multiscale cross-wavelet approach is a robust, data-driven technique. WaveITB provides operators with a fast, non-stationary, and low-preparation analytical tool for continuous reservoir surveillance.