Geochemical Characteristics and Hydrocarbon Generation ofPaleogene Oligocene Source Rocks in Qiongdongnan Basin

LI  Wen-Hao, ZHANG  Qi-Huan, LI  You-Chuan, FU  Ning, HUANG  Yan-Ran, LI  Qiong, ZHANG  Hui-Min

doi:10.11764/j.issn.1672-1926.2011.04.700

Natural Gas Geoscience >

2011 , Vol. 22 >Issue 4: 700 - 708

DOI: https://doi.org/10.11764/j.issn.1672-1926.2011.04.700

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Geochemical Characteristics and Hydrocarbon Generation ofPaleogene Oligocene Source Rocks in Qiongdongnan Basin

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1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
2.CNOOC Research Institute,Beijing 100027,China

Received date: 2010-10-24

Revised date: 2011-04-14

Online published: 2011-08-10

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Abstract

There are three sets of source rocks in the Qiongdongnan basin,including Eocene lacustrine source rock,Oligocene and Miocene marine gas layers.Since the Eocene unit has not yet been met during the drilling,it can only be considered as potential source rock in Oligocene.The total organic carbon (TOC) and hydrocarbon generation in the Oligocene source rocks in the Qiongdongnan basin reach the assessment standard of good source rock.The mudstone in the Oligocene source rocks of Yacheng and Lingshui Formations have the high TOC,associated with a certain hydrocarbon generation potential.The mudstone in the Oligocene source rocks of Yacheng and Lingshui Formations have a dominant vitrinite component,and minor sapropelic and exinite.Kerogen type of source rock is mainlyⅡ₂ or Ⅲ,and prone to generate gas.The n-alkane series of Yacheng Formation dark mudstone are characterized by high carbon number prominence,high Pr/Ph ratio,and low gammacerane index,showing the source rock had formed in oxygenated conditions.High abundance of oleanane detected in the hopane series of compounds shows the input of high plants.The C₂₇,C₂₈,C₂₉ regular steranes in the coal extract occur as opposite “L” pattern,indicating that the organic matter would be originated from the lacustrine high plants.But in the Yacheng Formation and Lingshui Formation mudstone,the sterane series are distributed as “V” pattern,suggesting there would be some of the algae inputs in addition to high plants.The algae input in some parts of Lingshui Formation source rocks greatly increased,indicating the more favorable conditions for generating hydrocarbon.

Key words： Hydrocarbon generation potential; Maceral; Biomarkers; Geochemical characteristics; Qiongdongnan basin.

Cite this article

LI Wen-Hao, ZHANG Qi-Huan, LI You-Chuan, FU Ning, HUANG Yan-Ran, LI Qiong, ZHANG Hui-Min . Geochemical Characteristics and Hydrocarbon Generation ofPaleogene Oligocene Source Rocks in Qiongdongnan Basin[J]. Natural Gas Geoscience, 2011 , 22(4) : 700 -708 . DOI: 10.11764/j.issn.1672-1926.2011.04.700

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