Geochemical Characteristics and Differences of Highly Matured Bitumen in the Sinian Dengying Formation

ZHU Dong-ya,JIN Zhi-jun,PENG Yong-min,ZHANG Rong-qiang

doi:10.11764/j.issn.1672-1926.2013.02.382

Natural Gas Geoscience >

2013 , Vol. 24 >Issue 2: 382 - 387

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.02.382

Geochemical Characteristics and Differences of Highly Matured Bitumen in the Sinian Dengying Formation

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Laboratory of Structural and Sedimentological Reservoir Geology,Petroleum Production and Research Institute of SINOPEC,Beijing 100083，China

Received date: 2012-08-22

Revised date: 2012-09-29

Online published: 2013-04-10

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Abstract

There is large amount of reservoir space including dissolution pores and tectonic fractures in the dolostone from the Sinian Dengying Formation in the central Guizhou uplift,which were filled with many dolomites,quartz and black bitumen.Based on the relationship,the formation of bitumen is later than that of dolomites but earlier than quartz.In this study,two groups of bitumen were sampled in Baima and Yankong outcrops,respectively.The Baima outcrop is located in Shuangliu town of Kaiyang county,Guizhou province,and the Yankong outcrop is in Yankong town of Jinsha county,Guizhou province.Both groups of bitumen have relatively high thermal maturity,and they are cubic or spherical under scanning electronic microscope.According to carbon isotopic compositions,bitumen is expected to be from the Lower Cambrian source rocks.There are remarkable differences between the two groups.Compared with those in Yankong outcrop,bitumen in Baima outcrop has relatively lower thermal maturity,higher in N,O and S contents and H/C ratios,and lighter in carbon isotopic compositions.The average R_b values for Baima and Yankong bitumen are 4.30% and 5.17%,respectively.Homogenization temperatures of fluid inclusions and R_b values indicate that bitumen of these two groups has experimented different burial-thermal evolution processes.The different processes cause the differences in element and isotopic compositions of bitumen from different locations.Such researches would be significant for further studies on genesis and sources of natural gas in the central Guizhou uplift.

Key words： Central Guizhou uplift; Dengying Formation; Bitumen; Element composition; Carbon isotope

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ZHU Dong-ya,JIN Zhi-jun,PENG Yong-min,ZHANG Rong-qiang . Geochemical Characteristics and Differences of Highly Matured Bitumen in the Sinian Dengying Formation[J]. Natural Gas Geoscience, 2013 , 24(2) : 382 -387 . DOI: 10.11764/j.issn.1672-1926.2013.02.382

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