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Petroleum Geology & Experiment  2019, Vol. 41 Issue (5): 731-738    DOI: 10.11781/sysydz201905731
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Pyrolysis hydrocarbon generation of the main source rock in Yin'gen-E'ji'naqi Basin
ZHU Lianfeng
International Department, Great Wall Drilling Company, CNPC, Beijing 100001, China
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Abstract  Lacustrine source rocks are widely developed in the second member of Bayingebi Formation of the Lower Cretaceous (K1b2) in the Yin'gen-E'ji'naqi Basin, and they are the main petroleum source rocks in the basin. Pyrolysis experiments show that the total hydrocarbon yield of the samples is 265-798 mg/g, the oil yield is 264-779 mg/g in the "oil window" (EasyRo of 0.7%-1.5%), and the yield of gaseous hydrocarbon during the main gas generation stage (EasyRo>1.5%) is 191-583 mL/g, which indicates that the source rocks not only have a high oil generation potential, but also have a high gas potential. The variation of hydrocarbon products during the pyrolysis experiments allow the thermal evolution of organic matter of source rocks to be divided into four main stages. The first stage is kerogen pyrolysis and oil generation stage, with an EasyRo of 0.57%-0.8% (the initial EasyRo of pyrolysis experiment is 0.57%). Kerogen pyrolyzes into oil. The second stage is the condensate oil generation stage, with an EasyRo of 0.8%-1.5%. Early oil cracks into light hydrocarbons and kerogen cracks into gas. In the third stage, oil cracks into gas, with an EasyRo of 1.5%-3.3%. The fourth stage is the gas cracking stage, with an EasyRo more than 3.3%. C2-5 cracks into methane.
Key wordspyrolysis experiment      hydrocarbon source rock      hydrocarbon generation potential      hydrocarbon evolution model      second member of Bayingebi Formation      Lower Cretaceous      Yin'gen-E'ji'naqi Basin     
Received: 28 April 2019      Published: 23 September 2019
ZTFLH:  TE122.1  
Cite this article:

.Pyrolysis hydrocarbon generation of the main source rock in Yin'gen-E'ji'naqi Basin[J].Petroleum Geology & Experiment,2019,41(5):731-738.

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http://www.sysydz.net/EN/10.11781/sysydz201905731     OR     http://www.sysydz.net/EN/Y2019/V41/I5/731

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