Floral Influences on the Petroleum Source Potential of New Zealand Coals

Newman, J.; Boreham, Christopher J.; Ward, S. D.; Murray, Andrew; Bal, Adriaan

doi:10.1007/978-94-017-1062-6_28

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…The increasing contribution of angiosperm flora is associated with higher petroleum source potential (Isaksen et al 1998;Newman et al 1999). In addition, the concentrations of long-chain n-alkanes in angiosperms are significantly higher than in gymnosperms (Diefendorf et al 2011(Diefendorf et al , 2015Lane 2017).…”

Section: Controlling Factors On Hydrocarbon Potentialmentioning

confidence: 99%

Geochemistry of Cenozoic coals from Sarawak Basin, Malaysia: implications for paleoclimate, depositional conditions, and controls on petroleum potential

Asiwaju,

Mustapha,

Abdullah

et al. 2024

Int J Coal Sci Technol

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Forty Tertiary coals from Mukah-Balingian and Merit-Pila coalfields of the Sarawak Basin, Malaysia were investigated using bulk and molecular geochemical techniques such as proximate analysis, gas chromatography-mass spectrometry, elemental analyser, isotope ratio mass spectrometry, and inductively coupled plasma mass spectrometry to reconstruct their paleovegetation, paleoclimate, and environments of deposition. In addition, principal component analysis (PCA) of selected geochemical parameters was carried out to determine the controlling influences on the petroleum potential of the humic coals. δ13C values and the abundance of terpenoids imply the predominant contribution of angiosperms to the paleoflora. Bimetal proxies (Sr/Ba, Sr/Cu, and C-value), and δD values are generally suggestive of a warm and humid climate during the accumulation of the paleopeats. However, n-alkane proxies (Pwax, Paq, n-C23/n-C29, etc.) and polycyclic aromatic hydrocarbons (PAHs) distribution suggest that Balingian coals accumulated under relatively drier and strongly seasonal paleoclimate in the Late Pliocene. When compared with published global average abundances, the investigated coals are mostly depleted in major oxides and trace elements, suggesting peat accumulation in freshwater-influenced environments. Nonetheless, higher (> 0.5 wt%) total sulfur content in some Mukah-Balingian coals suggests some degree of epigenetic marine influence. Furthermore, the low to moderately-high ash contents of the Sarawak Basin coals indicate the presence of ombrotrophic and rheotrophic peat deposits. PCA result of selected geochemical proxies suggests that source input, paleoflora, and marine incursions are not major controlling influences on the petroleum potential. However, climatic, and depositional conditions appear to slightly influence the petroleum potential of the studied humic coals.

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Section: Controlling Factors On Hydrocarbon Potentialmentioning

confidence: 99%

Geochemistry of Cenozoic coals from Sarawak Basin, Malaysia: implications for paleoclimate, depositional conditions, and controls on petroleum potential

Asiwaju,

Mustapha,

Abdullah

et al. 2024

Int J Coal Sci Technol

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“…Petersen and Rosenberg (2000) studied the relationship between HI and %Ro but only found a weak and negative correlation. Other research showed that the HI value displays a strong correlation to volatile matter, which can also be considered as a substitute for petroleum generation potential (Suggate and Boudou 1993;Newman et al 1999). Therefore, the maturity parameters of organic matter must be explored in order to construct effective indices for the assessment of petroleum potential.…”

Section: Introductionmentioning

confidence: 98%

Statistical analysis of relations between petrographic and geochemical indices of oil generation potential in organic matter

Lee

2010

Carbonates Evaporites

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To establish reliable indices for the synthetic assessment of petroleum potential using reworked sediment from mixed datasets, multivariate statistical analysis and cross-plots were used. New guidelines for improved assessment of generative potential and thermal maturity are suggested. Based on statistical analysis and cross-plots of HI, QI and BI versus the vitrinite reflectance (%Ro) and T max (°C), the HI max , QI max and BI max lines are defined between the vertex of the upper and lower limits of the HI-band, QIband and BI-band as defined by a majority of the samples. The constructed HI, QI and BI bands were broad at low maturities and gradually narrowed with increasing thermal maturity. The petroleum generation potential is completely exhausted at a vitrinite reflectance of 2.0-2.2% or a T max of 510-520°C. An increase in HI and QI suggests extra petroleum potential related to changes in the structure of the organic material. A decline in BI signifies the start of the oil expulsion window and occurs within the vitrinite reflectance range 0.75-1.05% or a T max of 440-455°C. Furthermore, petroleum potential can be divided into four different parts based on the cross-plot of HI versus %Ro. The area with the highest petroleum potential is located in section II with %Ro = 0.6-1.0%, and HI [ 100. Oil generation potential is rapidly exhausted at section III with %Ro [ 1.0%. This result is in accordance with the regression curve of HI and QI with %Ro based on 80 samples with %Ro = 1.02-3.43%. The exponential equation of regression can thus be achieved: curve, HI = 994.81e -1.69Ro (R 2 = 0.72) and QI = 1646.2e -2.003Ro (R 2 = 0.72). The worldwide organic material dataset defines two oil expulsion windows represented by the upper and lower limits of the BI band: %Ro * 0.75 to *1.95% or T max * 440 to *525°C, and %Ro * 1.05 to *1.25% or T max * 455 to *465°C, respectively. The start of the oil expulsion window occurs within the %Ro range of *0.75-1.05 %Ro or the T max range *440-455°C and the total oil window extends to %Ro = * 1.25-1.95 or T max = * 465-525°C.

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“…Petersen and Rosenberg (2000) studied the relationship between HI and Ro%, but found only a weak and negative correlation. Other researches show that the HI value is strongly correlated with volatile matter, which can also be considered as a substitute for petroleum generation potential (Suggate and Boudou 1993;Newman et al 1999).…”

Section: Introductionmentioning

confidence: 98%

Relationships among geochemical indices of coal and carbonaceous materials and implication for hydrocarbon potential evaluation

2009

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A worldwide dataset of organic material from 553 samples belonging to coal and carbonaceous materials was used to analyze the evolution of hydrogen index (HI) and bitumen index (BI) with increasing thermal maturity. Basic statistical analyses were applied to detect the boundary lines of HI max and BI max in delineating the upper and lower limits of the HI and BI bands for the majority of samples. In addition, cross-plots of HI or BI versus maturity (Ro% and T max ) also provide criteria for defining the HI max and BI max boundary lines. The constructed HI and BI bands are broad at low maturities and become narrower with increasing thermal maturities. The petroleum generation potential is completely exhausted at the vitrinite reflectance of 2.0-2.2% or T max of 510-520°C. An increase in HI implies extra petroleum generation which was related to changes in structure of organic materials. A declining BI means that the oil expulsion window starts to occur at the vitrinite reflectance range of 0.75-1.05%. The petroleum potential can be divided into four different areas based on the cross-plot of HI versus Ro%. The highest petroleum potential area is located in section II with Ro = 0.6-1.0% and HI [ 100. The oil generation potential is rapidly exhausted at section III with Ro [ 1.0%. This result is also in accordance with the result of curve regression of HI versus Ro% based on 80 samples with Ro = 1.02-3.43% (R 2 = 0.72). Overall, the total oil window can be extended up to Ro = *1.25-1.95%. Finally, in the cross-plots of S1 versus S2, shale or C-shale exhibits a higher and slowly decreased slope, compared with a lower and then sharply increased slope of coal samples, which is attributable to their compositional difference in organic material.

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Floral Influences on the Petroleum Source Potential of New Zealand Coals

Cited by 7 publications

References 17 publications

Geochemistry of Cenozoic coals from Sarawak Basin, Malaysia: implications for paleoclimate, depositional conditions, and controls on petroleum potential

Geochemistry of Cenozoic coals from Sarawak Basin, Malaysia: implications for paleoclimate, depositional conditions, and controls on petroleum potential

Statistical analysis of relations between petrographic and geochemical indices of oil generation potential in organic matter

Relationships among geochemical indices of coal and carbonaceous materials and implication for hydrocarbon potential evaluation

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