Vibrational spectroscopic characterization of mudstones in a hydrocarbon-bearing depression, South China Sea: Implications for thermal maturity evaluation

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Entao LiuYunfei Xi

Abstract

A better understanding of mineral transformations in sedimentary rocks and the controls on thermal maturity have become essential in the petroleum exploration industry in recent years. The Fushan Depression is an important hydrocarbon-bearing depression in South China Sea, which can be subdivided into three structural zones: the western, central and eastern zones. In this study, a series of mudstone samples selected from 13 drilling cores with depths ranging from 2100 to 3800 m were studied using infrared reflectance spectroscopy and X-Ray Powder Diffraction (XRD) methods. And another 10 samples have been chosen for vitrinite reflectance measurement so as to investigate the ability of using infrared spectroscopy for thermal maturity evaluations. The infrared spectra results show that quartz and silicates (e.g. illite, kaolinite, smectite) are the dominant minerals in all samples. The semi-quantitative XRD analysis reveals a clear trend in illite content as the eastern zone (mean 80.81%)>the western zone (mean 73.52%)>the central zone (mean 55.04%) as well as a contrary trend in kaolinite content. This study documents that the peak height and position of Si-O antisymmetric stretching bands at ~1025 cm(-1) and ~1000 cm(-1) have a...Continue Reading

References

Jun 1, 1974·International Journal of Nursing Studies·R Farmer
Jan 24, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Rose B MerolaMolly M McGuire

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