| Autor: |
Humairoh, Wahyuni Annisa, Surjono, Sugeng Sapto, Winardi, Sarju, Negara, I Made Sutha |
| Zdroj: |
Arabian Journal of Geosciences; Dec2021, Vol. 14 Issue 23, p1-19, 19p |
| Abstrakt: |
The Middle Eocene Ngimbang Clastics interval of the Ngimbang formation represents the oldest syn-rift deposits in the North East Java extensional basin. It has been proven in previous publications its potential as source rock. Apart from that, Ngimbang Clastics interval can also potentially be a hydrocarbon reservoir rock. This study enhances the understanding of facies and sandstone reservoir distribution in this interval, through the analysis of electro-facies, rock physics and simultaneous inversion by using well logs and 3D pre-stack seismic data. Facies map of this interval is generated based on lithology and fluid impedance for determining reservoir potential area. The results show that three facies types of rock − 5000 to 3500 ft/s × g/cc for porous sand, above 4000 to 20,000 ft/s × g/cc for shaly-sand, shale and non-porous sand and above 20,000 ft/s × g/cc for coal based on the lithology impedance. Reservoir interval is porous sand facies with good porosity of 9.5–17.5%. Facies development for reservoir distribution in the study area is constructed based on a slicing lithological impedance map which shows that the porous sand facies are deposited in alluvial-braided channels, and in a wave-dominated estuarine depositional environments. Porous sand has a geometry of channel fills and bars that develop on the study area's west and southwest sides. Gas sand identified based on fluid impedance has value below 15,500 ft/s × g/cc. The distribution of gas fluid in the Ngimbang Clastics interval's porous sandstones can be found on the west and southwest side of the study locally. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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