#TITLE_ALTERNATIVE#

• Main Author: Prima Kurniawan (NIM 123 02 026), Anggoro
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/5741
• Institution: Institut Teknologi Bandung

Abstract : <br /> <br /> <br /> <br /> <br /> <br /> <br /> The 4-D Microgravity study was carried out in area X minas field, PT. Chevron Pasific Indonesia to identify water injection effect in the reservoir. Data acquisition was carried out two times, precisely in march - april 2006 and july - august 2006 using three gravitymeters, such as Gravitymeter Lacoste and Romberg G1158 and G826 was used to measure gravity value in each station, another gravitymeter, Gravitymeter Lacoste and Romberg G508, was used to observe the gravity tidal. Time-lapse microgravity anomaly was derived by reducing local gravity observed in march 2006 to local gravity observed at july 2006. Next, we used moving-average method with windows 1000 x 1000 m2 to remove noise from timelapse microgravity anomaly. The Time-lapse microgravity anomaly map shows that the positive time-lapse microgravity anomaly value indicates mass addition in the reservoir , which is caused by water injection process, especially on the N-E study area. The negative time-lapse microgravity anomaly value indicates mass reduction in the reservoir, which is caused by production process, especially on the middle study area. These conclusions are supported by geological subsurface models from line A-A, B-B and C-C, which are derived by using forward modeling method.