Coupling relationship between tight oil and gas accumulationand compacting history in southwestern Ordos Basin,China
Received date: 2017-02-17
Revised date: 2017-05-02
Online published: 2017-06-10
In this paper,we investigate the coupling relationship between tight oil and gas accumulation and densification in the Upper Triassic Yanchang Formation in the southwestern part of Ordos Basin.Based on the analyses of diagenetic sequences and inclusion homogenization temperature,hydrocarbon inclusions in quartz over growth were trapped in the peak of hydrocarbon generation and expulsion in the middle and late periods of Early Cretaceous,while those in ferruginous carbonates were formed by hydrocarbon charging in the late period of Early Cretaceous.Original reservoir porosity,permeability,the capillary force and the excee pressure and their relationship with reservoirs in hydrocarbon accumulation periods were studied based on the present pore characteristics and the capillary force of reservoirs.The results show that hydrocarbon mainly accumulate in reservoirs with good porosity and permeability.However,there are differences in controlling factors of porosity and permeability in two accumulation periods.It is proposed that the super low permeability reservoirs had not been developed in the middle and late periods of Early Cretaceous,the ironed carbonate cement in the reservoir compacted eventually with poor property of reservoirs in the late period of Early Cretaceous.The characteristics of abnormal pressure showed that the abnormal high pressure,which was generated by under-compaction and increasing pressure during maturation of excellent source rocks in Chang 7 sub-layer,was the principal force of large-scale hydrocarbon migration in low permeability reservoir.
Li Wei,Wen Zhi-gang,Dou Li-rong,Xie Xie,Wang Ze,Li Xin . Coupling relationship between tight oil and gas accumulationand compacting history in southwestern Ordos Basin,China[J]. Natural Gas Geoscience, 2017 , 28(6) : 920 -929 . DOI: 10.11764/j.issn.1672-1926.2017.05.006
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