https://library.universitaspertamina.ac.id//xmlui/handle/123456789/58 Collections of Geophysical Engineering Students' Dissertations and Theses Tue, 14 Apr 2026 10:20:58 GMT 2026-04-14T10:20:58Z 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. Sun, 01 Feb 2026 00:00:00 GMT https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15719 2026-02-01T00:00:00Z 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. Fri, 13 Feb 2026 00:00:00 GMT https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15712 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. Sun, 01 Feb 2026 00:00:00 GMT https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15711 2026-02-01T00:00:00Z https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15074 Perhitungan Cadangan Batuan Andesit Menggunakan Metode Resistivitas Pada Area Lapangan “X”. Radhitio, Muhammad Pembangunan infrastruktur yang semakin meningkat di Indonesia menuntut ketersediaan material konstruksi berkualitas tinggi secara berkelanjutan, salah satunya adalah batuan andesit yang dikenal karena kekuatan dan ketahanannya. Su lawesi Tengah, khususnya wilayah Donggala, merupakan daerah dengan kom pleksitas geologi tinggi yang diduga memiliki potensi formasi batuan andesit ber dasarkan hasil pemetaan geologi sebelumnya. Penelitian ini bertujuan untuk men gidentifikasi sebaran bawah permukaan dan mengestimasi cadangan volumetrik ba tuan andesit menggunakan metode geolistrik tahanan jenis dengan konfigurasi Wenner. Pengukuran lapangan dilakukan pada 13 lintasan survei di Desa Loli Pesua, Kabupaten Donggala, dengan jarak antar elektroda sebesar 7 meter. Data hasil pen gukuran kemudian diolah menggunakan perangkat lunak RES2DINV dan dimodel kan secara tiga dimensi dengan perangkat lunak Voxler untuk visualisasi distribusi resistivitas bawah permukaan. Hasil penelitian menunjukkan bahwa zona dengan nilai resistivitas lebih dari 938 Ω.m mengindikasikan keberadaan batuan andesit segar dan masif, sementara nilai antara 416–938 Ω.m mengindikasikan batuan an desit yang teralterasi atau berkompaksi sedang. Enam lintasan survei (GL-01, GL 02, GL-03, GL-04, GL-07, GL-09) memperlihatkan keberadaan andesit potensial pada kedalaman 7–20 meter. Estimasi volumetrik berdasarkan interpretasi 3D menunjukkan adanya total cadangan terukur batuan andesit sebesar 5.942.653 m³, yang terdiri atas batuan andesit berkompaksi sedang hingga masif. Temuan ini menegaskan bahwa wilayah penelitian memiliki potensi sumber daya andesit yang tinggi, serta menunjukkan efektivitas metode resistivitas dalam mengidentifikasi dan menghitung sumber daya batuan bawah permukaan secara akurat dan berke lanjutan. Mon, 11 Aug 2025 00:00:00 GMT https://library.universitaspertamina.ac.id//xmlui/handle/123456789/15074 2025-08-11T00:00:00Z