#TITLE_ALTERNATIVE#

• Main Author: NAULI SARI (NIM : 12012026), MUTHIA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20339
• Institution: Institut Teknologi Bandung

Research area located in LNG field, a gas field located in Northern East Java Basin. Research area has an area about 209,0468 km2. The research target located in Kujung 1 Unit Carbonate Reservoir which is a stratigraphic trap that associated with carbonate body that sliced by north-south fault and bedrocks lineaments trending NE-SW which follow the Meratus Pattern. The reservoir quality distribution in this research is mainly controlled by diagenesis. The research purpose are to create geological models and estimating the amount of hydrocarbons reserves in place (IGIP) in LNG field, especially at Kujang 1 Unit. The data in this research are wireline log from two wells, 3D seismic data, drill cutting data, biostratigraphy, DST, RCAL, and velocity cube. The research method are well data analysis, petrophysic analysis, seismic data analysis, reservoir geometry determination, and reservoir modeling to calculate hydrocarbon reserve in place (IGIP). The results obtained from these methods are the main geological structure of LNG field which is normal fault trending north - south that predicted formed after deposition of Tuban Formation (Middle Miocene), built-up carbonate, and bedrock lineament trending northeast – southwest which follow the Meratus Pattern. Bedrock was Pre-Tertiary, in the Early Oligocene the depositional environment of research area was highland and lowland due to spreading process which which follow the Meratus Pattern and Kujung III was deposited. Sea levels has continued to rise, the depositional environment became inner neritic to middle neritic and Kujung II Unit was deposited. In the Early Miocene when Kujung 1 Unit was deposited there had been a drop of sea level that caused diagenesis and made the bottom part of Kujung 1 Unit more porous. Estimation of hydrocarbon reserves in place (IGIP) at the reservoir of research area is 571 x 106 MSCF.