RESERVOIR CHARACTERIZATION USING EXTENDED ELASTIC IMPEDANCE INVERSION OF UDANG FORMATION, âSZFâ FIELD, WEST NATUNA BASIN
The West Natuna Basin is one of the basins that produce hydrocarbon, especially gas, in Indonesia. The “SZF” Field is located in the West Natuna Basin and focusing on Udang Formation. The Lithology of this formation is an interchange of thin-layered shale and sandstone, so it needs a method that...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/68762 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The West Natuna Basin is one of the basins that produce hydrocarbon, especially
gas, in Indonesia. The “SZF” Field is located in the West Natuna Basin and
focusing on Udang Formation. The Lithology of this formation is an interchange of
thin-layered shale and sandstone, so it needs a method that can separate the two
lithologies well. In assisting the characterization process, elastic parameter that
are sensitive to the lithology and fluid distribution in the target area is needed.
Therefore, this study utilise the Extended Elastic Impedance (EEI) inversion method
because of its ability to create reflectivity volume of various elastic parameters.
Based on the sensitivity analysis, it was found that the parameter that are sensitive
to differentiate between reservoir that contain hydrocarbon and non-reservoir in
the target area are the Lambda-Rho and Vp/Vs ratio. The multiplication between
Lambda-Rho and Vp/Vs ratio is expected to enhance the parameter ability to
differentiate reservoir that contain hydrocarbon and non-reservoir. Then the
reflectivity volumes of P-wave (Rp) and S-Wave (Rs) is created using the two-term
AVO Ursenbach-Stewart equation. From the volumes of Rp and Rs, the EEI
reflectivity volume of sensitive parameters are formed using the EEI equation. Then
the volume of sensitive parameters was inverted using the Linear Programming
Sparse Spike method.
The result of this study shows that the target zones are located in the Udang 1,
Udang 2 and Udang 3 formation. The parameter that generated by the multiply of
Lambda-Rho with Vp/Vs ratio are quite good in mapping the distribution of the
hydrocarbon reservoir with the cutoff at 60 GPa*(g/cc). Hydrocarbon reservoir
potential is located at the high areas of Udang 1, Udang 2 and Udang 3 Formation. |
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