How to Build New Interpretation Concept using Dynamic Data: A case Study in Carbonate of Upper Cibulakan, North West Java Basin, Indonesia

Southeast Asian Conference on Geophysics

Pramudito, Dimas^1 ; Meidiana, Tania^1 ; Alfianto, A.D.^2 ; Rizki Nurhadi, Dhea^2

Geoscience in Geology and Geophysics Department, Pertamina EP Asset 3, Indonesia^1

Engineer Support in Geology and Geophysics Department, Pranalika Energi Nusa, Indonesia^2

关键词: Amplitude envelope;    Carbonate reservoir;    Depositional environment;    Different pressures;    Distribution characteristics;    Instantaneous frequency;    Seismic interpretation;    Vertical distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/62/1/012016/pdf
DOI  :  10.1088/1755-1315/62/1/012016

来源: IOP

【 摘 要 】

Bravo Structure is one of the Pertamina EP gas producing field in North West Java Basin region. This structure located at Subang about 10 km southeast from City Subang. The objective of this structure is a vertical compartment of carbonate due to diagenetic effect and transgression. This evident cause shale deposited and divide multi-layer carbonate reservoir. The carbonate lies at Cibulakan Formation and has three reservoirs: Z-14, Z-15, and Z-16 limestone. Since each reservoir has different pressure data and CO2contain, so it becomes challenges to make new interpretation and to know those compartments between reservoirs. To look up geometry distribution detailed, this structure is reinterpreted using 3D seismic (2014) and new concept depositional environment based on wells correlation and core analysis. Generating seismic interpretation using seismic inversion and attribute. Amplitude envelope and instantaneous frequency are calculated to obtain sweetness. Both of them are built by 3D volume seismic. High magnitude from amplitude envelope is used to characterize geometry distribution of carbonate while instantaneous frequency determines low frequency because of gas distribution. The result of this study suggests vertical and lateral carbonate distribution characteristics Meanwhile sweetness attribute can determine gas contain in each layer Z-14 and Z-15. Vertical distribution of Z-14 layer about 140 m (porosity 7-11%) and Z-15 about 70 m (porosity 8-13%). Finally, interpreting carbonate both Z-14 and Z-15 as shelf margin that new concept gives a chances to develop this structure and optimize reservoir management.