Pendekatan Otomatis Well-Seismic Tie: Integrasi Ekstraksi Wavelet Berbasis Gabor Deconvolution Dan Dynamic Time Warping Pada Lapangan Torosa, Cekungan Browse

Suryantoro, Firza Rizaldi (2026) Pendekatan Otomatis Well-Seismic Tie: Integrasi Ekstraksi Wavelet Berbasis Gabor Deconvolution Dan Dynamic Time Warping Pada Lapangan Torosa, Cekungan Browse. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Well-seismic tie otomatis pada data dengan atenuasi Q yang signifikan menghadapi dua tantangan utama, yaitu ketidakstationeran wavelet seismik akibat peluruhan frekuensi seiring kedalaman dan ketidakselarasan temporal antara seismogram sintetik dan trace seismik. Penelitian ini mengintegrasikan Dekonvolusi Gabor dan Dynamic Time Warping (DTW) untuk mengatasi kedua permasalahan tersebut secara otomatis. Dekonvolusi Gabor digunakan untuk mengestimasi wavelet time-variant dalam domain time-frequency, sementara DTW dengan pendekatan Marker Anchored digunakan untuk menyelaraskan seismogram sintetik terhadap trace seismik menggunakan posisi marker formasi sebagai titik jangkar hard constraint. Validasi pada data sintetis terkontrol menunjukkan bahwa Dekonvolusi Gabor mampu me-recover komponen frekuensi dan amplitudo wavelet dengan koefisien korelasi global r = 0,951 dan RMSE frekuensi 7,96 Hz, meskipun estimasi fasa pada zona dalam tidak sepenuhnya berhasil akibat instabilitas transformasi Hilbert ketika SNR menurun. DTW Marker Anchored menghasilkan korelasi r = 0,990–0,993 dengan tops error = 0 pada seluruh skenario stretch dan squeeze ±10%–±30%, dibandingkan Fixed Band yang menghasilkan korelasi sebanding namun dengan tops error 4–6 marker per skenario. Metode diterapkan pada data nyata Lapangan Torosa, Cekungan Browse, yang mencakup lima sumur yaitu NSR-1, Torosa-2, Torosa-3, Torosa-4, dan Torosa-5, dan menghasilkan korelasi r = 0,571–0,800 dengan tops error = 0 di seluruh sumur, meningkat dari kondisi pre-tie r = -0,236 hingga 0,205. Pada penampang seismik 2D, seluruh marker dari Formasi Barracouta hingga Triassic terposisi konsisten pada reflektor yang sama secara lateral di kelima sumur, mengkonfirmasi bahwa integrasi Dekonvolusi Gabor dan DTW Marker Anchored efektif untuk well-seismic tie otomatis pada data lapangan dengan karakteristik atenuasi Q yang kompleks.
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Automatic well-seismic tie on data with significant Q attenuation faces two main challenges: seismic wavelet non-stationarity due to frequency decay with depth, and temporal misalignment between synthetic seismograms and seismic traces. This study integrates Gabor Deconvolution and Dynamic Time Warping (DTW) to address both problems automatically. Gabor Deconvolution is used to estimate time-variant wavelets in the time-frequency domain, while DTW with the Marker Anchored approach aligns synthetic seismograms to seismic traces using formation marker positions as hard constraint anchor points. Validation on controlled synthetic data shows that Gabor Deconvolution successfully recovers wavelet frequency and amplitude components with a global correlation coefficient of r = 0.951 and frequency RMSE of 7.96 Hz, although phase estimation at deeper zones was not fully achieved due to Hilbert transform instability as SNR decreases with cumulative Q attenuation. Marker Anchored DTW yields correlation r = 0.990–0.993 with tops error = 0 across all stretch and squeeze scenarios of ±10%–±30%, compared to Fixed Band which produces comparable correlation but with tops error of 4–6 markers per scenario. The method was applied to field data from the Torosa Field, Browse Basin, covering five wells: NSR-1, Torosa-2, Torosa-3, Torosa-4, and Torosa-5, yielding correlation r = 0.571–0.800 with tops error = 0 across all wells, improved from pre-tie conditions of r = -0.236 to 0.205. On the 2D seismic section, all markers from the Barracouta Formation to the Triassic are laterally consistent on the same reflector across all five wells, confirming that the integration of Gabor Deconvolution and Marker Anchored DTW is effective for automatic well-seismic tie-on field data with complex Q attenuation characteristics.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Well-seismic tie, Dekonvolusi Gabor, Dynamic Time Warping, Wavelet time-variant, Atenuasi Q. Well-seismic tie, Gabor Deconvolution, Dynamic Time Warping, Time-variant Wavelet, Q attenuation
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Firza Rizaldi Suryantoro
Date Deposited:	17 Jul 2026 07:38
Last Modified:	17 Jul 2026 07:38
URI:	http://repository.its.ac.id/id/eprint/135318

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