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Geofluids
Volume 2017, Article ID 4580416, 15 pages
https://doi.org/10.1155/2017/4580416
Research Article

Distribution and Thermal Maturity of Devonian Carbonate Reservoir Solid Bitumen in Desheng Area of Guizhong Depression, South China

1China University of Geosciences Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, Wuhan 430074, China
2Geological Experimental Testing Center of Hubei Province, Wuhan 430034, China
3Petroleum Exploration Branch Company, Sinopec, Chengdu 610041, China

Correspondence should be addressed to Yuguang Hou; moc.621@gyhtrops and Sheng He; nc.ude.guc@ehgnehs

Received 3 March 2017; Revised 18 May 2017; Accepted 28 June 2017; Published 15 August 2017

Academic Editor: John A. Mavrogenes

Copyright © 2017 Yuguang Hou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The distribution of solid bitumen in the Devonian carbonate reservoir from well Desheng 1, Guizhong Depression, was investigated by optical microscope and hydrocarbon inclusions analysis. Vb and chemical structure indexes measured by bitumen reflectance, laser Raman microprobe (LRM), and Fourier transform infrared spectroscopy (FTIR) were carried out to determine the thermal maturity of solid bitumen. Based on the solid bitumen thermal maturity, the burial and thermal maturity history of Devonian carbonate reservoir were reconstructed by basin modeling. The results indicate that the fractures and fracture-related dissolution pores are the main storage space for the solid bitumen. The equivalent vitrinite reflectance of solid bitumen ranges from 3.42% to 4.43% converted by Vb (%) and LRM. The infrared spectroscopy analysis suggests that there are no aliphatic chains detected in the solid bitumen which is rich in aromatics C=C chains (1431–1440 cm−1). The results of Vb (%), LRM, and FTIR analysis demonstrate that the solid bitumen has experienced high temperature and evolved to the residual carbonaceous stage. The thermal evolution of Devonian reservoirs had experienced four stages. The Devonian reservoirs reached the highest reservoir temperature 210–260°C during the second rapid burial-warming stage, which is the main period for the solid bitumen formation.