Geochemical Characteristics and Hydrocarbon Generation ofPaleogene Oligocene Source Rocks in Qiongdongnan Basin
Received date: 2010-10-24
Revised date: 2011-04-14
Online published: 2011-08-10
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.
LI Wen-Hao, ZHANG Qi-Huan, LI You-Chuan, FU Ning, HUANG Yan-Ran, LI Qiong, ZHANG Hui-Min . Geochemical Characteristics and Hydrocarbon Generation ofPaleogene 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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