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Franz L. Kessler
Goldbach Geoconsultants O&G and Lithium Exploration, Germany
Earth & Planetary Sciences

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Baram Line or West Baram Line? A Discussion with Late Prof. H.D. Tjia on Its Nomenclature in Jong et al. (2016) Franz L. Kessler; John Jong
Berita Sedimentologi Vol 36, No 1 (2016)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (922.237 KB) | DOI: 10.51835/bsed.2016.36.1.97

Abstract

This note summarises the unedited correspondence and discussion we had with late Prof. H.D. Tjia on the above topic, starting with an initial email received by the corresponding author of the article “Structural Development, Deposition Model and Petroleum System of Paleogene Carbonate of the Engkabang-Karap Anticline, Onshore Sarawak” by Jong et al. (2016) published in Berita Sedimentologi, Vol. 34, p. 5-25.
Destructive Diagenesis Observed in Outcrop Examples of Neogene Sandstone Reservoir and Clay Contact Zones, Miri, Northern Sarawak Franz L. Kessler; John Jong
Berita Sedimentologi Vol 43, No 1 (2019)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2290.741 KB) | DOI: 10.51835/bsed.2019.43.1.69

Abstract

The occurrence of diagenetic siderite and iron oxide deposits has been recognized in offshore subsurface reservoirs of Baram Delta fields. Iron-rich intra-reservoir deposits are relatively common in coastal Sarawak, but good examples are rare. In this article, we present outcrop examples of the Miri area. In three selected locations, geometries and composition of diagenetically-derived iron precipitates can be explored, measured and analyzed. The destructive impact of siderite rims on net reservoir volume for STOIIP calculation, and their potential interaction with chemicals used for enhanced oil recovery (EOR) is also noted.
A Study of Neogene Sedimentary Outcrops of the Greater Miri Area - Can Clay Gouging Be Calibrated in Outcrops and Shallow Subsurface Boreholes? Franz L. Kessler; John Jong
Berita Sedimentologi Vol 39, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3133.194 KB) | DOI: 10.51835/bsed.2017.39.1.86

Abstract

The greater Miri area offers particularly well-exposed world-class examples of fault geometry and clay gouging. Such information offers good material for studying fault architecture and clay smear morphology, and help to understand fault seal mechanisms in the subsurface. Recent studies on fault and clay gouging in the Neogene sedimentary rocks of greater Miri area show a variety of fault geometries of both abrasive-type and shear-type. In a Nippon Oil-sponsored study carried out in Curtin University, fifteen (15) core holes were drilled through clay-gouged fault planes at three outcrop locations. Cores of the formation were taken, and the drilled holes were then pressurized by water injection for packer testing. The performed leak-off test results were somewhat surprising - weathered Neogene sediments of the Miri and Tukau formations offered little or no pressure retention in fault zones and host rock alike, and leak-off fracturing occurs already at 1.25 bar. The rock mechanics of weathered rock might be very different from fresh rock, and may offer little or no insight into those of virgin rocks. Therefore, weathered rock properties may not be suitable for subsurface fault seal simulation studies.
Co-Authors John Jong John Jong