https://library.universitaspertamina.ac.id//xmlui/handle/123456789/43 Collections of Geophysical Engineering Department 2026-04-25T15:27:41Z https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15719 POST-STACK SEISMIC INVERSION OF "TXT" FIELD, NEW ZEALAND KRISMARTOPO, HANIIFAH MAS'UUDAH Jr Taranaki Basin is one of the most prolific areas for oil and gas in New Zealand. This study aims to map the acoustic impedance from Tikorangi until the Basement. Then, the map will be qualitatively used to understand the distribution of porosity of the reservoir within the interval of interest. The interval of interest includes the Oligo–Miocene Tikorangi Limestone and Middle–Upper Miocene Kapuni sandstone groups. Based on the petrophysics calculation performed on TU and KH wells, the Tikorangi limestone has average porosity of 0.05 in KH well & 0.15 in TU well, and Kapuni sandstones has average porosity of 0.2 in KH well & 0.3 in TU well. Then, cross plot between acoustic impedance and total porosity shows that the porosity is decreasing with increasing acoustic impedance. Model Based Inversion technique is used to invert the 3D seismic data to acoustic impedance cube. The inversion reveals that the acoustic impedance is higher in Tikorangi compared to Kapuni sandstone complex. This result agrees with the cross plot result that shows Tikorangi is tighter than Kapuni sandstone groups. 2026-02-01T00:00:00Z https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15714 Interpretasi Seismik 3D Lapangan T, New Zealand Krismartopo, Haniifah Mas'uudah Jr 2025-02-01T00:00:00Z https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15712 ANALYSIS OF ACOUSTIC IMPEDANCE (AI) INVERSION AND MULTI-ATTRIBUTE SEISMIC METHODS FOR HYDROCARBON RESERVOIR CHARACTERIZATION IN THE CEE FIELD This study aims to characterize the hydrocarbon reservoir in the CEE Field, Upper Talang Akar Formation, South Sumatra Basin, using an acoustic impedance (AI) seismic inversion approach combined with multi-attribute seismic analysis. Well log data were utilized to identify lithology and target zones, which are characterized by low gamma ray values, porosity above 0.2, and low water saturation. AI inver- sion identified a reservoir zone with acoustic impedance values between 5,000 and 7,000 g/cc*m/s, consistent with the characteristics of sandstone as a reservoir rock. A high correlation (0.91) between the inversion results and well log data indicates the reliability of the inversion output. Furthermore, the multi-attribute stepwise re- gression method was applied to predict porosity distribution, yielding a training correlation of 0.856 and a validation correlation of 0.711. These results enable higher-resolution mapping of the reservoir zone, both laterally and vertically. The integration of AI inversion and multi-attribute analysis has proven effective in en- hancing the accuracy of subsurface geological modeling and in supporting more precise identification of hydrocarbon-prospective zones. 2026-02-13T00:00:00Z https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15711 POST-STACK SEISMIC INVERSION OF "TXT" FIELD, NEW ZEALAND Krismartopo, Haniifah Mas'uudah Jr Taranaki Basin is one of the most prolific areas for oil and gas in New Zealand. This study aims to map the acoustic impedance from Tikorangi until the Basement. Then, the map will be qualitatively used to understand the distribution of porosity of the reservoir within the interval of interest. The interval of interest includes the Oligo–Miocene Tikorangi Limestone and Middle–Upper Miocene Kapuni sand-stone groups. Based on the petrophysics calculation performed on TU and KH wells, the Tikorangi limestone has average porosity of 0.05 in KH well & 0.15 in TU well, and Kapuni sandstones has average porosity of 0.2 in KH well & 0.3 in TU well. Then, cross plot between acoustic impedance and total porosity shows that the po-rosity is decreasing with increasing acoustic impedance. Model Based Inversion technique is used to invert the 3D seismic data to acoustic impedance cube. The inversion reveals that the acoustic impedance is higher in Tikorangi compared to Kapuni sandstone complex. This result agrees with the cross plot result that shows Tikorangi is tighter than Kapuni sandstone groups. 2026-02-01T00:00:00Z