Aplikasi Metode Inversi Pre-stack AVO Simultan Untuk Analisis Zona Prospek Hidrokarbon, Studi Kasus Lapangan “ZY”

Pramesthi, Esti Woro (2024) Aplikasi Metode Inversi Pre-stack AVO Simultan Untuk Analisis Zona Prospek Hidrokarbon, Studi Kasus Lapangan “ZY”. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5017201057-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2026. Download (9MB) | Request a copy

Abstract

Lapangan “ZY” terletak di daerah Cekungan Barito termasuk dalam Formasi Warukin yang memiliki prospek cukup besar untuk pengembangan eksplorasi minyak dan gas bumi. Jenis reservoir hidrokarbon terdapat pada lapisan batupasir yang diendapkan dalam lingkungan muka delta. Potensi keberadaan cadangan hidrokarbon sangat dipengaruhi oleh karakteristik reservoir meliputi tingkat saturasi fluida dan jenis litologi. Dalam penelitian ini digunakan metode inversi pre-stack tahapan analisis Amplitude Versus Offset (AVO) sebagai parameter input dalam proses inversi. Berdasarkan analisis senstifitas, hasil cross-plot dapat memisahkan karakter litologi dan fluida zona target. Cross-plot densitas dengan p-wave menunjukkan bahwa zona target memiliki nilai densitas berkisar antara 1,8 g/c hingga 2,3 g/cc dan kecepatan gelombang P berkisar antara 105 us/ft sampai dengan 140 us/ft, cross-plot antara P-impedance dengan parameter Vp/Vs memiliki nilai impedansi akustik berkisar antara 3962 (m/s)*(g/cc) hingga 4572 (m/s)*(g/cc) dengan variasi densitas lebih rendah sehingga dapat diindikasikan sebagai zona gas-sand. Hasil analisis AVO menunjukkan bahwa respon reservoir gas memiliki nilai positif ditinjau dari peta hasil slicing atribut product dan respon reservoir gas peta hasil slicing poisson’s ratio memiliki nilai negatif. Peta sebaran atribut scaled poisson’s ratio menunjukkan pada zona target disekitar lokasi sumur memiliki nilai poisson’s ratio rendah. Keberadaan gas dihubungkan dengan nilai Poisson’s Ratio rendah, karena pada zona gas akan menurunkan nilai kecepatan gelombang P yang berpengaruh terhadap rasio Vp/Vs dan Poisson’s ratio. Hasil analisis AVO menunjukkan bahwa zona target mengindikasikan adanya zona hidrokarbon berupa gas, hal ini ditinjukkan dengan karakteristik respon AVO kelas III. Sementara berdasarkan hasil pengolahan atribut AVO reservoir gas memiliki nilai positif ditinjau dari peta hasil slicing atribut product dan reservoir gas peta hasil slicing poisson’s ratio memiliki nilai negatif. Hasil penampang inversi menunjukkan adanya anomali pada zona target Lapangan “ZY”.
====================================================================

The "ZY" field is located in the Barito Basin area, within the Warukin Formation, which has significant prospects for oil and gas exploration development. The type of hydrocarbon reservoir is found in sandstone layers deposited in a delta-front environment. The potential presence of hydrocarbon reserves is greatly influenced by reservoir characteristics, including fluid saturation levels and lithology types. In this study, the pre-stack inversion method with Amplitude Versus Offset (AVO) analysis is used as an input parameter in the inversion process. Based on sensitivity analysis, cross-plot results can distinguish lithology and fluid characteristics of the target zone. A cross-plot of density with P-wave shows that the target zone has a density range between 1.8 g/cc and 2.3 g/cc and a P-wave velocity range between 105 us/ft and 140 us/ft. The cross-plot between P-impedance and the Vp/Vs parameter shows an acoustic impedance range between 3,962 (m/s)*(g/cc) and 4,572 (m/s)*(g/cc) with lower density variation, indicating a gas-sand zone. The AVO analysis results indicate that the gas reservoir response has a positive value as seen from the attribute product slicing map, and the gas reservoir response from the Poisson's ratio slicing map has a negative value. The distribution map of the scaled Poisson's ratio attribute shows that the target zone around the well location has a low Poisson's ratio value. The presence of gas is associated with a low Poisson's Ratio value, as in the gas zone it will reduce the P-wave velocity, affecting the Vp/Vs ratio and Poisson's ratio. AVO analysis results indicate that the target zone suggests the presence of a hydrocarbon zone in the form of gas, as shown by the Class III AVO response characteristics. Based on the AVO attribute processing results, the gas reservoir has a positive value as observed from the product attribute slicing map, and the gas reservoir slicing map for Poisson's ratio has a negative value. The inversion section results show anomalies in the target zone of the "ZY" Field.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	analisis AVO, atribut AVO, inversi simultan, AVO analysis, AVO attribute, simultaneus inversion
Subjects:	T Technology > T Technology (General) > T57.5 Data Processing
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Esti Woro Pramesthi
Date Deposited:	09 Aug 2024 02:36
Last Modified:	24 Sep 2024 06:56
URI:	http://repository.its.ac.id/id/eprint/114854

Actions (login required)

View Item