Microfacies Data: Fabrics

Flügel, Erik

doi:10.1007/978-3-642-03796-2_5

Cited by 5 publications

(2 citation statements)

References 62 publications

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“…Dissolution is the leaching of the metastable bioclasts due to the presence or circulation of the meteoric waters (Tucker and Wright, 2009;Flügel, 2004). However, partial dissolution of the bioclasts is common in the upper zone of the well, which depends on the original bioclasts composition stability as shown in Figure 4A and B.…”

Section: Dissolutionmentioning

confidence: 99%

“…Cement precipitation (drusy or blocky) and/or by matrix during deposition or post-deposition by compaction processes can clog the pores resulting in lower permeability (Tucker, 2009;Lucia, 2007). Drusy calcite cement is thought to be a sign of early diagenesis in a meteoric environment, whereas the saddle dolomite and the fluorite mineral are believed to be formed by circulation of hydrothermal fluids at a deep (Flügel, 2004;Tucker, 2009;Lambert et al, 2006;Hollis et al, 2010;Alsharhan and Nairn, 1990). It is also believed to have occurred after reaching burial depth of around 600 m at temperatures of around 65.6°C (Cox et al, 2010).…”

Section: Cementationmentioning

confidence: 99%

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Petrographic and diagenetic studies of thick transition zone of a middle-east carbonate reservoir

Mohamed¹,

Belhaj²,

Gomes³

et al. 2017

J. Petroleum Gas Eng.

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This work aims to characterize petrographically some of the transition zone plug samples in order to understand the impact of diagenetic processes on the transition zone rock quality. Three carbonate samples were collected from the same well which cuts through a thick transition zone of a heterogeneous cyclic carbonate reservoir of Abu Dhabi with respect to depth. The petrographic analysis was conducted by the thin sections study and scanning electron microscope (SEM) imaging in order to interpret the main depositional facies, diagenetic features and how the poro-perm characteristics were affected by them. SEM analysis is utilized in order to observe and recognize in detail the diagenetic relationships between different mineral phases or cement types and to help in identifying the pore geometry. Diagenesis in the transition zone is very extensive especially affected by micritization and cementation. The diagenetic features are increasing with depth as the zone is having higher water saturations. The importance of this analysis is to better understand the rock fabric heterogeneity and capillary pressure behavior as a function of depth of thick carbonate transition zones.

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Section: Dissolutionmentioning

confidence: 99%

Section: Cementationmentioning

confidence: 99%

Petrographic and diagenetic studies of thick transition zone of a middle-east carbonate reservoir

Mohamed¹,

Belhaj²,

Gomes³

et al. 2017

J. Petroleum Gas Eng.

View full text Add to dashboard Cite

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Depositional and diagenetic constraints on the quality of shale‐gas reservoirs: A case study from the Late Palaeocene of the Potwar Basin (Pakistan, Eastern Tethys)

et al. 2022

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Unconventional shale‐gas reservoir assessment concurs numerous exploration challenges, often related to their complex lithology, which reflects secular changes in depositional environment(s) as well as spatially variable diagenetic overprinting. This study combines a range of methods (sedimentological, petrographical, CL‐microscopy, X‐ray diffraction, TOC (total organic carbon), TON (total organic nitrogen) and δ13Corg and δ15Norg stable isotopes) to address the controls of lithofacies, palaeo‐depositional environment(s) and diagenesis on the shale‐gas reservoir potential of the Late Palaeocene Patala Formation in the Potwar Basin of Pakistan. This formation records sediment accumulation in a shallow, mixed siliciclastic‐carbonate shelf environment. Sedimentological and X‐ray diffraction (XRD) analyses show that the formation is primarily composed of an alternation of carbonaceous, siliceous, calcareous and argillaceous mudstone lithofacies. Detrital assemblages, including grains of quartz, apatite, calcite, chlorite, as well as organic matter (OM) and clay minerals with auxiliary (authigenic) pyrite, dominate the formation. High terrigenous influx is represented by the abundance of siliciclastics and terrigenous OM. The δ13Corg and δ15Norg proxies reflect dysoxic to anoxic palaeo‐environmental conditions, which promoted preservation of mixed marine and terrigenous OM, a setting considered to be indicative for high shale‐gas potential. The organic‐rich siliceous and carbonaceous mudstone lithofacies are considered to be the most prospective intervals, while calcareous and argillaceous mudstones are considered least promising in terms of reservoir quality. Spatially variable eo‐, meso‐ and telo‐diagenetic features such as compaction, cementation, stylolitization, dissolution and re‐precipitation are superimposed upon the depositional fabric, which locally affected the reservoir quality of the Patala Formation. The results of this study strongly suggest that the organic‐ and quartz‐rich mudstone lithofacies constitute “sweet spots” whose occurrence in space and time may be traced to design a strategy for shale‐gas exploration in the Potwar Basin of Pakistan and in analogous settings elsewhere.

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Origin and significance of carbonate shoal depositional cycles: A case study of the Cambrian Longwangmiao Formation, Sichuan Basin, SW China

Yang

Chen

et al. 2022

Journal of Asian Earth Sciences

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Microfacies Data: Fabrics

Cited by 5 publications

References 62 publications

Petrographic and diagenetic studies of thick transition zone of a middle-east carbonate reservoir

Petrographic and diagenetic studies of thick transition zone of a middle-east carbonate reservoir

Depositional and diagenetic constraints on the quality of shale‐gas reservoirs: A case study from the Late Palaeocene of the Potwar Basin (Pakistan, Eastern Tethys)

Origin and significance of carbonate shoal depositional cycles: A case study of the Cambrian Longwangmiao Formation, Sichuan Basin, SW China

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