Ival Umar Sayaf

Geological Engineering graduate with practical experience as a Geology Research Assistant at LEMIGAS. First author of two peer-reviewed publications focused on facies analysis and depositional environment reconstruction. Experienced in multi-well reservoir evaluation, petrophysical interpretation, core description, and geospatial mapping through internships and projects with Pertamina EP Cepu, LEMIGAS, and Badan Geologi.

1. BBPMGB LEMIGAS - Geology Research Assistant (Apprenticeship, Nov 2025 - May 2026) Conducted core description and sedimentary facies analysis on a 14 m core interval covering siliciclastic and carbonate rocks, documenting lithology, sedimentary textures and structures, and facies associations to support depositional environment interpretation; performed petrographic thin-section analysis to assess mineralogy, rock texture, diagenetic features and stages, and visual porosity; and synthesized published literature to evaluate the tectonic evolution, stratigraphy, and petroleum system elements of the Central Sumatra Basin.

2. Pertamina EP Cepu - Thesis Intern (Jan 2025 - Mar 2025) Evaluated the Minahaki Formation carbonate reservoir quality across seven wells by integrating wireline logs, core, and cuttings to determine key reservoir properties, including shale volume, porosity, permeability, and water saturation; characterized depositional facies and diagenetic history to identify geological controls on reservoir heterogeneity and porosity evolution; and estimated Original Gas in Place (OGIP) while quantifying reserve uncertainty through P10, P50, and P90 scenarios using probabilistic Monte Carlo simulation of volumetric parameters.

Bachelor of Engineering in Geological Engineering – Universitas Padjadjaran (2021-08 – 2025-08)