Skripsi

PEMODELAN 3D FASIES PADA INTERVAL RESERVOAR FORMASI TALANG AKAR DI LAPANGAN “KRG”, CEKUNGAN SUMATERA SELATAN.

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This study was conducted at the “KRG” Field to understand the reservoar characteristics through facies log interpretation, sequence stratigraphic analysis, and 3D facies distribution modeling. The study is important because reservoar heterogeneity and facies distribution influence hydrocarbon potential estimation and field development planning. Regionally, analyses using well log data from multiple drilling points show that the reservoar intervals are located between the TOP TAF and MFS zones, with variations in thickness and lithology reflecting reservoar heterogeneity. Facies log interpretation based on gamma-ray, resistivity, and density logs indicates a fining-upward pattern, suggesting a transitional (tidal) depositional environment resulting from the interaction of fluvial and marine processes. Sequence stratigraphic analysis indicates that the reservoar belongs to a Progradational Parasequence Set within a Regressive System Tract (RST), signifying that sediment supply dominated over sea-level rise, resulting in progradation toward the sea. This condition affects the lateral development of facies distribution following the progradation direction. Facies modeling was performed using the Truncated Gaussian Simulation (TGS) method with isopach map control and variogram analysis. The results indicate a primary depositional direction of NE–SW and a minor NW–SE direction, reflecting the anisotropy of the depositional system. The reservoar geometry is dominated by tidal channel systems with elongated sand bodies and uneven distribution. The 3D model shows lateral and vertical facies variations that influence reservoar quality, particularly the distribution of porosity and permeability. Overall, this study successfully integrates geological analyses to provide a comprehensive understanding of the reservoar characteristics at the “KRG” Field. The results show that facies distribution and reservoar quality are controlled by depositional environment and stratigraphy, making this approach a reference for reservoar studies in fields with similar geological conditions. Furthermore, the study emphasizes the importance of correlating well data with seismic interpretation to map reservoar heterogeneity more accurately. 3D seismic analysis allows for the identification of local structures. Integration of seismic data with 3D facies modeling enables more accurate hydrocarbon volumetric estimation, as well as predictions of porosity and permeability distribution in undrilled areas. This approach also aids in planning optimal development well locations, designing injection strategies, and minimizing the risk of reserve estimation errors. By utilizing a combination of facies log interpretation, sequence stratigraphy, and 3D seismic modeling, this study enhances the understanding of depositional dynamics and reservoar heterogeneity, which is critical for efficient and sustainable management of the “KRG” Field. The analysis results indicate that tidal channel facies dominate the reservoar geometry, with elongated and unevenly distributed sand bodies, whereas interchannel areas show significant heterogeneity in porosity and permeability. Lateral and vertical facies variations affect overall reservoar quality and highlight zones with higher hydrocarbon potential. Additionally, facies log and sequence stratigraphic interpretations confirm the fining-upward pattern in the transitional environment, reflecting the influence of fluvial-marine interactions during Talang Akar Formation deposition. The main depositional direction of NE–SW and minor NW–SE detected through TGS modeling indicates significant anisotropy in the depositional system. Integrating all these data allows high-precision mapping of reservoar characteristics, providing a solid basis for optimal production strategy development while minimizing technical and economic risks in field management.

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Detail Information

Series Title

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Call Number

T2008802026

Publisher

Indralaya : Prodi Teknik Geologi, Fakultas Teknik Universitas Sriwijaya., 2026

Collation

xviii, 85 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

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Classification

553.280 7

Content Type

Text

Media Type

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Carrier Type

-

Edition

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Subject(s)

Formasi Talang Akar
Prodi Teknik Geologi

Specific Detail Info

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Statement of Responsibility

MI

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