An Experimental Method to Evaluate the Hydrocarbon Generationand Expulsion Efficiency in the Songliao Basin
Received date: 2014-10-15
Revised date: 2014-12-22
Online published: 2015-05-10
The process and condition of hydrocarbon generation and expulsion has been simulated on the Cretaceous source rocks from the Songliao Basin, based on the latest experiment platform of hydrocarbon generation and expulsion.New hydrocarbon measurement method is used to acquire accurate data about experimental products including light hydrocarbon.The geological RO are correlated with atomic H/C ratios of pyrolyzed kerogens from experimental solid products.Thus hydrocarbon generation and expulsion efficiency in the thermal evolution process is determined.Results show that, the content of light hydrocarbon is about 5%-29% and about 25% during the peak period of oil generation, and it increases with the increase of thermal maturation.The maximum amount of hydrocarbon generation is 680mg/g TOC, and the absolute hydrocarbon expulsion efficiency at the peak of oil generation is 57%.Analysis of pressure factor indicates that, fluid pressure does affect thermal maturation and hydrocarbon expulsion.Pressure can reduce the maturity in oil generation phase.The decreased value of RO is about 0.2%.Pressure release promotes hydrocarbon expulsion, which results in the decrease of residual hydrocarbon content and light hydrocarbon loss from cores.Light hydrocarbon loss can cause 18% deviation of expulsion efficiency at oil generation peak.The conventional method underestimated the residual hydrocarbon amount in geological conditions, and gas exploration prospect is optimistic.
CHEN Rui-yin,WANG Hui-tong,CHEN Jian-ping,LIU Yu-ying . An Experimental Method to Evaluate the Hydrocarbon Generationand Expulsion Efficiency in the Songliao Basin[J]. Natural Gas Geoscience, 2015 , 26(5) : 915 -921 . DOI: 10.11764/j.issn.1672-1926.2015.05.0915
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