Electronic Theses and Dissertation

Peran multiatribut seismik sangat penting dalam identifikasi zona reservoir. penelitian ini bertujuan untuk mengidentifikasi dan menganalisis zona potensial reservoir pada formasi upper-lower seurula dan keutapang di cekungan sumatra utara. multiatribut seismik yang digunakan meliputi rms amplitudo, variance, dan sweetness, yang diintegrasikan dengan data log sumur. interpretasi dan analisis data yang dilakukan telah melalui proses well-to-seismic tie dengan nilai korelasi sebesar 0,637. selanjutnya dilakukan interpretasi horizon dan patahan yang menghasilkan peta struktur waktu dan kedalaman serta zona dengan potensi akumulasi hidrokarbon. tahapan terakhir adalah melakukan analisis multiatribut. hasil analisis menunjukkan bahwa formasi keutapang merupakan zona reservoir utama, ditandai oleh nilai rms amplitudo dan sweetness yang tinggi serta kontras impedansi akustik yang kuat. formasi lower seurula juga menunjukkan indikasi sebagai zona prospek sekunder, sementara formasi upper seurula bukan reservoir yang prospek. validasi terhadap data log sumur memperkuat hasil interpretasi, terutama pada zona dengan karakteristik porositas tinggi, resistivitas menengah hingga tinggi, serta adanya cross-over antara kurva densitas (rhob) dan porositas (nphi). berdasarkan temuan ini, integrasi data seismik dan log sumur terbukti efektif untuk meningkatkan akurasi identifikasi zona reservoir dan struktur tinggian dan rendahan serta patahan. sebagai tindak lanjut, disarankan untuk mengintegrasikan data sumur tambahan guna memungkinkan analisis petrofisika lanjutan. selain itu, integrasi dengan data geologi dan geokimia, seperti sampel batuan dari sumur bor dan kandungan total organic carbon (toc) untuk memperkuat hasil interpretasi. kata kunci: multiatribut, log-sumur, reservoir, cekungan-sumatra-utara, well-to-seismic tie

The role of seismic multi-attributes analysis is crucial in identifying reservoir zones. This study aims to identify and analyze potential reservoir zones within the Upper-Lower Seurula and Keutapang formations in the North Sumatra Basin. The seismic attributes applied include the RMS amplitude, variance, and sweetness, that were integrated with well log data. Data interpretation and analysis were conducted through the following steps; a well-to-seismic tie, resulting in a correlation coefficient of 0,637. Subsequent steps involved horizon and fault interpretation, producing time and depth structure maps as well as identifying zones with potential hydrocarbon accumulation. The final stage was multi-attribute analysis. The result indicates that the Keutapang Formation is the main reservoir zone, characterized by high RMS Amplitude and sweetness values, as well as strong acoustic impedance contrast. The Lower Seurula Formation also shows indications as a secondary prospective zone, while the Upper Seurula Formation is considered as a non-prospective zone. Validation with well log data supported the interpretation, particularly in zones with high porosity, moderate to high resistivity, and cross-over indicator between density (RHOB) and neutron porosity (NPHI) curves. Based on the findings, the integration of seismic and well log data effectively proves the enhancing of the accuracy of reservoir zone identification and subsurface interpretation. As a follow-up, it is recommended to incorporate additional well data from which, the advanced petrophysical analyses can be carried out in the future. Lastly, an integration of the geological and geochemical data, such as cores and Total Organic Carbon (TOC) can strengthen the interpretation. Keywords: Multi-attributes, well-log, reservoir, North-Sumatra-Basin, well-to-seismic tie.