Open AccessReservoir Characterization using Simultaneous Inversion for Identifying the Sandstone Reservoir of Air Benakat Formation “IDY” Field in South Sumatra Basin
Author(s) -
I. D. Yuliandari,
Alamsyah M. Juwono,
Said Sabbeq
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/546/7/072014
Subject(s) - inversion (geology) , structural basin , geology , reservoir modeling , electrical impedance , natural gas field , sichuan basin , mineralogy , petrology , geomorphology , geotechnical engineering , chemistry , geochemistry , engineering , organic chemistry , natural gas , electrical engineering
. This research was conducted using simultaneous inversion seismic method. The inversion method can be used not only to identify reservoirs, but to identify the fluid content in a rock formation. Formation in this study is Air Benakat Formation, in the South Sumatra Basin. Simultaneous inversion has the results in the form of P-impedance, S-impedance, density, P-wave velocity, S-wave velocity, and ν p / ν s . From the data that have been obtained, that IDY-1 well is considered as a gas saturated sandstone reservoir. Fluid Replacement Modeling (FRM) was also used, in this study, to obtain the detailed information about the presence of gas in the Air Benakat Formation. FRM can simulate the state of the formation if it were in an in situ case condition, and in the gas case condition. From the results of FRM processing, that is for the gas case condition of 90%, it was obtained the ν p / ν s value of 1.75 to 1.875. While, in the in situ case condition, the ratio was obtained to be 2.0 to 2.2. Based on simultaneous inversion results, the research area is known to have a P-impedance value of 5800 to 6000 (m / s) * (g / cc), an S-impedance of 2000 to 4000 (m / s) * (g / cc), the density of 2.2 to 2.27 g/g/cm 3 and the ν p / ν s ratio of 2.17 to 2.25. To identify the distribution of sandstone reservoirs, a horizontal cross-section map was made, which produced results of the cross section of low impedance and low ν p / ν s value. This shows that the IDY-1 well is a well-saturated sandstone reservoir.