Evaluasi Pore Pressure untuk Penentuan Kelayakan Penyimpanan Karbon pada Formasi Talang Akar, Cekungan Asri, Sumatra Tenggara

Ridhandi, Fahmi (2025) Evaluasi Pore Pressure untuk Penentuan Kelayakan Penyimpanan Karbon pada Formasi Talang Akar, Cekungan Asri, Sumatra Tenggara. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5017211045-Undergraduate_Theses.pdf Restricted to Registered users only until 1 April 2027. Download (15MB) | Request a copy

Abstract

Geological Carbon Storage (GCS) merupakan salah satu metode penting dalam upaya reduksi karbon dengan memanfaatkan sumur-sumur migas yang tidak lagi produktif atau kering. Penelitian ini berfokus pada evaluasi kelayakan Cekungan Asri di lepas pantai Sumatera Tenggara sebagai lokasi penyimpanan karbon. Injeksi & penyimpanan karbon ke bawah permukaan menghadapi tantangan nyata, salah satunya adalah tekanan bawah permukaan. Estimasi nilai tekanan yang kurang tepat dapat mengakibatkan bencana yang tidak diharapkan terjadi seperti kebocoran. Penelitian ini bertujuan untuk mengestimasi tekanan pori serta menganalisis distribusi tekanan pori pada Formasi Talang Akar Cekungan Asri. Data yang digunakan meliputi log sumur Wireline dan seismik Post Stack. Analisis melibatkan evaluasi Compaction Trend, reversal data log, dan interval velocity dari data seismik untuk menilai tekanan pori. Estimasi tekanan pori dilakukan menggunakan metode Eaton dengan validasi pengukuran langsung seperti pressure test. Berdasarkan hasil pengolahan serta analisis tekanan pori, Formasi Talang Akar layak untuk dijadikan tempat penyimpanan karbon yang aman. Hasil perhitungan pada area Crestal dan Flank menunjukkan nilai tekanan pori yang relatif sama dengan kenaikan tekanan pori yang selaras dengan bertambahnya kedalaman dengan interval tekanan 100 – 135 bar dengan gradien 0.95 – 1 sg atau 0.028 – 0.030 bar/ft. Sedangkan pada area Central menunjukkan indikasi adanya overpressure pada kedalaman mendekati Formasi Banuwati yang merupakan source rock pada petroleum system di Cekungan Asri. Pada area ini didapatkan interval tekanan sebesar 64 – 668 bar dengan gradien 1.02 sg hingga 1.73 sg atau 0.030 – 0.052 bar/ft pada zona overpressure.
=================================================================================================================================
Geological Carbon Storage (GCS) is a crucial method for carbon reduction, utilizing depleted or dry oil and gas wells for long-term carbon sequestration. This study focuses on evaluating the feasibility of the Asri Basin, located offshore Southeast Sumatra, as a potential site for carbon storage. The injection and storage of carbon in subsurface formations face significant challenges, one of which is subsurface pressure. Inaccurate pore pressure estimation can lead to catastrophic outcomes, such as leakage. The objective of this research is to estimate pore pressure and analyze its distribution within the Talang Akar Formation of the Asri Basin. The data utilized in this study include Wireline logs and Post-Stack seismic data. The analysis encompasses an evaluation of Compaction Trends, log data reversals, and interval velocity derived from seismic data to assess pore pressure. Pore pressure estimation was conducted using the Eaton method, validated with direct measurements such as pressure tests. The results of the analysis and pore pressure evaluation indicate that the Talang Akar Formation is a suitable and secure site for carbon storage. Calculations for the Crestal and Flank areas revealed consistent pore pressure values, with an increase proportional to depth. The pore pressure intervals range from 100 to 135 bar, with a gradient of 0.95–1 specific gravity (SG) or 0.028–0.030 bar/ft. In contrast, the Central area showed indications of overpressure at depths approaching the Banuwati Formation, which serves as the source rock in the Asri Basin petroleum system. This zone exhibited pore pressure intervals ranging from 64 to 668 bar, with gradients between 1.02 SG and 1.73 SG, or 0.030–0.052 bar/ft, within the overpressure zones.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Cekungan Asri, Eaton, GCS, Talang Akar, Tekanan Pori
Subjects:	Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE539.2 Seismic traveltime inversion Q Science > QE Geology > QE539.2.S4 Seismic models Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Fahmi Ridhandi
Date Deposited:	18 Feb 2025 00:38
Last Modified:	18 Feb 2025 00:38
URI:	http://repository.its.ac.id/id/eprint/118768

Actions (login required)

View Item