Subvolcanic hydrocarbon prospectivity of Java

Awang_subvolcanic java

Numerous oil and gas seeps occur on Java Island concealing prospective basin sediments. However, most of this island is covered by volcanic products of Paleogene to Recent times. The volcaniclastic sediments buried the source rocks, burying the source rocks to depths of oil and gas windows. Oil and gas seeps in volcanic areas of Java show the presence of active petroleum systems underneath the volcanic cover. This indicates hydrocarbon prospectivity on Java Island (subvolcanic play) that is so far unexplored. Volcaniclastic covers are notorious for causing poor seismic data quality, making subsurface imaging difficult. This will challenge the methods and techniques of seismic and nonseismic data acquisition and processing. Once these challenges are resolved, the subvolcanic play of Java may be revealed.

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Welcome to our blog

Bumi_ino

Hi all! Welcome to our blog, Tektonesiana.

The name of Tektonesiana is derived from the word tectonics and Indonesia. Tektonesiana represents our ‘passion’ on tectonics of Indonesia.

We, Indonesian geologists who share the same interest, use this blog to post articles that represent our works. These articles have been presented in scientific meetings. Some of them also have been published in journals. We have many questions about tectonics of Indonesia, and we want to share them with you. Enjoy our blog!

View our list of publications

Inverted intra arc transtensional deepwater basin in West – Central Java border: New interpretation of basin evolution and its implication to the petroleum system

This article, which has been presented AAPG Annual Conference and Exhibition, New Orleans, Louisiana, April 2010 explains about tectonics of a Tertiary deepwater intra‐arc basin that experienced inversion by thrust faults. Oil seeps along this area may indicate distribution of source rock. The expelled and migrated hydrocarbon could reach in to potential traps and accumulated in reservoirs in these basins. The tectonics and paleogeographic reconstructions of this basin are expected to reveal the characteristics of petroleum systems.

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New insight on the deformation along the southern Java forearc

This note is taken from an abstract presented at American Geophysical Union, Fall Meeting 2012. The new seismic data set in south Java resolved detailed structures of the southern Java forearc. The plate interface expressed as irregular surface in the western part and rather a continuous smooth boundary in the eastern area. This observation coincides with the higher uplift of the western part of the forearc high. Cluster of shallow earthquakes can be observed near the western part of Java trench. Deformation of the forearc high is more intense in the west compared to that in the east. This coincides with higher uplift of the western part of the forearc high, thus complicated the structures.

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Structural Reactivation and its Implication on Exploration Play: Case Study of JS-1 Ridge

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This work has been presented at INDONESIAN PETROLEUM ASSOCIATION, Thirty-Sixth Annual Convention & Exhibition, May 2012. The authors of this article explained paleotectonic evaluation of the WMO area, and suggests another potential play other than Kujung Formation. Seismic interpretation with some attributes and also ant-track method are applied to strengthen the exploration concept. Another play that is quite interesting should be added to exploration in this area. Syn-rift play can be found in the western and eastern flank of JS-1 with Ngimbang Formation as the objective, whilst the post Kujung play can be emphasized on the flower structure pattern as an indication of wrench faulting. This wrench fault is responsible for tearing apart the Rancak and O.K. Formations during intra Miocene.

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Discovery of outcrop-scale fine-grained sediment waves in the lower Halang Formation, an upper Miocene submarine-fan succession in West Java

Mukti_2010_sed wav

This article is about the first discovery of outcrop-scale, fine-grained sediment waves in the left-side muddy overbank deposits relative to the down-current direction of the adjacent channel deposits in the lower Halang Formation turbidite system in a late Miocene back-arc basin, West Java. The present outcrop-scale examples can fill the gap in dimension and formative processes between laboratory-scale bedforms and modern large-scale, fine-grained sediment waves for elucidating scale-independent processes, which are responsible for the development of fine-grained waveforms in a deep-water environment. This article has been published in Sedimentary Geology.

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