New approach towards the classification of microporosity in Miocene carbonate rocks, Central Luconia, offshore Sarawak, Malaysia

Janjuhah, Hammad Tariq; Alansari, Abubaker; Ghosh, Deva Prasad; Bashir, Yasir

doi:10.1016/j.jnggs.2018.05.001

Cited by 16 publications

(10 citation statements)

References 23 publications

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“…Despite the petrophysical analysis indicating moderate to good porosity, permeability is very low in both localities, possibly because the samples are highly micritized. The high micritization is a guarantee of high microporosity (Janjuhah et al, 2018b). Microporosity controls the depositional texture in carbonate rocks, as has recently been observed in reservoirs rocks from southern Texas (Loucks et al, 2013).…”

Section: Petrophysical Properties and Reservoir Qualitymentioning

confidence: 78%

Biostratigraphy, Depositional and Diagenetic Processes in Carbonate Rocks from Southern Lebanon: Impact on Porosity and Permeability

Janjuhah

Sanjuan

Alqudah

et al. 2021

Acta Geologica Sinica (Eng)

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Carbonate rocks are gaining more importance as natural building stones, karst aquifers, and hydrocarbon reservoirs in many parts of the world, including the giant fields of the Middle East (Burchette, 2012). According to Ehrenberg and Walderhaug (2015), more than 50% of all hydrocarbon reserves are hosted in carbonate rocks. Various physico-chemical and biological processes are associated with the formation and modification of carbonate rocks, leading to dramatic changes in their storage capacity, petrophysical, elastic and textural properties (

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Section: Petrophysical Properties and Reservoir Qualitymentioning

confidence: 78%

Biostratigraphy, Depositional and Diagenetic Processes in Carbonate Rocks from Southern Lebanon: Impact on Porosity and Permeability

Janjuhah

Sanjuan

Alqudah

et al. 2021

Acta Geologica Sinica (Eng)

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“…Understanding permeability behavior is critical for evaluating recoverable hydrocarbons in a reservoir because it controls fluid-flow properties [76]. Permeability is usually associated with porosity, however, when dealing with carbonate, the uncertainty is quite high due to the complicated pore structure [21,77]. The problems of porosity and permeability in hydrocarbon prediction in carbonate reservoirs have driven researchers to improve porosity and permeability correlation.…”

Section: Effect Of Microporosity On Petrophysical Propertiesmentioning

confidence: 99%

“…Malaysia's central Luconia carbonate reserves have great hydrocarbon potential. [20,21]. These carbonates contain 65 trillion cubic feet of gas and a modest oil deposit, making them commercially important [17].…”

Section: Introductionmentioning

confidence: 99%

“…Because it is a significant hydrocarbon province, the province of Luconia offshore Sarawak is a critical geological unit for understanding Malaysia's distribution of hydrocarbon resources. According to Janjuhah, Alansari, Ghosh and Bashir [21] commercial levels of an unrelated gas have been discovered in 56 carbonate platforms. These reservoirs are often associated with grain-rich facies types.…”

Section: Introductionmentioning

confidence: 99%

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Integrated Porosity Classification and Quantification Scheme for Enhanced Carbonate Reservoir Quality: Implications from the Miocene Malaysian Carbonates

Janjuhah

Kontakiotis

Wahid

et al. 2021

JMSE

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The pore system in carbonates is complicated because of the associated biological and chemical activity. Secondary porosity, on the other hand, is the result of chemical reactions that occur during diagenetic processes. A thorough understanding of the carbonate pore system is essential to hydrocarbon prospecting. Porosity classification schemes are currently limited to accurately forecast the petrophysical parameters of different reservoirs with various origins and depositional environments. Although rock classification offers a way to describe lithofacies, it has no impact on the application of the poro-perm correlation. An outstanding example of pore complexity (both in terms of type and origin) may be found in the Central Luconia carbonate system (Malaysia), which has been altered by diagenetic processes. Using transmitted light microscopy, 32 high-resolution pictures were collected of each thin segment for quantitative examination. An FESEM picture and a petrographic study of thin sections were used to quantify the grains, matrix, cement, and macroporosity (pore types). Microporosity was determined by subtracting macroporosity from total porosity using a point-counting technique. Moldic porosity (macroporosity) was shown to be the predominant type of porosity in thin sections, whereas microporosity seems to account for 40 to 50% of the overall porosity. Carbonates from the Miocene have been shown to possess a substantial quantity of microporosity, making hydrocarbon estimate and production much more difficult. It might lead to a higher level of uncertainty in the estimation of hydrocarbon reserves if ignored. Existing porosity classifications cannot be used to better understand the poro-perm correlation because of the wide range of geological characteristics. However, by considering pore types and pore structures, which may be separated into macro- and microporosity, the classification can be enhanced. Microporosity identification and classification investigations have become a key problem in limestone reservoirs across the globe.

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“…Sarawak basin accounts for 27% of the total reserve of Malaysia's oil and approximately 54% of its gas potential reserves [1], including the prolific Central Luconia reservoirs. Having more than 200 carbonate build-ups, Central Luconia contributes around 60% of Malaysia's gas reserve [2]. Approximately 65 Tcf of gas and minor oil have been discovered from its Miocene carbonate platform, and the fields have been producing for 30 years [3].…”

Section: Introductionmentioning

confidence: 99%

Compaction history based on porosity, pressure and temperature relation in Central Luconia province, offshore Sarawak

Refael

Jamaludin

Latiff

2022

IOP Conf. Ser.: Earth Environ. Sci.

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This study investigates the role of porosity in relation to temperature and pressure within Miocene-Pliocene sediments in Central Luconia province. The main objective is to understand the effect on porosity loss within Miocene-Pliocene sediments as part of the compaction of the sediments through time. The methodology involves seismic interpretation of 2D seismic lines and analysis of four wells over the central complex in Central Luconia province. Thick sedimentation was found within the clastic sediments of Cycle VI, indicating major clastic influx from the deltas and onshore of Sarawak during Pliocene. These clastic sediments had become a major source of weight in the offshore basin, inducing compaction within the older formations. Porosity distributions based on the wells showed that Cycle VI had the highest porosity in LH1 well with 33.77% porosity, while porosity within Cycle IV & V limestone showed an average porosity of 22% in all wells. Porosities within Cycle III and Cycle II were observed to be average of 16%. The porosity within the reservoir rock was reduced as the depth increased. This porosity reduction was relatively due to the compaction of the sediments, linked with the changes of pressure and temperature indicated by several evidences found in each well. Overpressure zone affects irregularity of porosity reduction with depth, whereas high temperature promotes diagenetic reaction that causes sudden porosity loss. Nevertheless, a sudden increase in porosity was also observed at the top of Cycle IV & V limestone due to a major drop in the sea level during the Early Late Miocene, which had encouraged the karstification process, inducing secondary porosity. This study has proved that compaction within Miocene-Pliocene sediments is not only related to the loss in porosity, but it involves changes in pressure and temperature regime of sediments and is highly dependent on the natural changes of sea level.

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New approach towards the classification of microporosity in Miocene carbonate rocks, Central Luconia, offshore Sarawak, Malaysia

Cited by 16 publications

References 23 publications

Biostratigraphy, Depositional and Diagenetic Processes in Carbonate Rocks from Southern Lebanon: Impact on Porosity and Permeability

Biostratigraphy, Depositional and Diagenetic Processes in Carbonate Rocks from Southern Lebanon: Impact on Porosity and Permeability

Integrated Porosity Classification and Quantification Scheme for Enhanced Carbonate Reservoir Quality: Implications from the Miocene Malaysian Carbonates

Compaction history based on porosity, pressure and temperature relation in Central Luconia province, offshore Sarawak

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