Leading effect of high-class source rock of Chang 7 in Ordos Basin on enrichment of low permeability oil-gas accumulation——Hydrocarbon generation and expulsion mechanism
Leading effect of high-class source rock of Chang 7 in Ordos Basin on enrichment of low permeability oil-gas accumulation——Hydrocarbon generation and expulsion mechanism
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DOI：
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发表时间：
2006
影响因子：
7.5
通讯作者：
Ma Jun
中科院分区：
文献类型：
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作者：
Ma Jun
通过地球化学测试、生烃热模拟实验，结合盆地石油地质特征，分析了长7油页岩段高级烃源岩的排烃特征及机理，计算了排烃速率，长7产烃量达400 kg/t，TOC及其生烃扩张的增压作用为石油初次运移提供了足够的能量干酪根网络系统和孔隙-裂缝系统构成了运移的三维网络系统，连续油相是初次运移的主要相态，油页岩段成熟生油前的强烈压实作用对排烃效率没有影响，相反，较低的残余孔隙度降低了对烃类的吸藏能力，有利于提高排烃效率（平均达到72%），使优质烃源岩具有高烃低水的优质流体，为低渗透油藏原油富集提供了有利条件。
Based on geochemical testing,hydrocarbon-generation thermal simulation experiment,and the basin petroleum geologic characteristics,the paper analyzes the hydrocarbon-expulsion and mechanism of the high-class source rock in Chang 7 oil-shale section,and calculated the hydrocarbon expulsion rate.The yield of Chang 7 is up to 400kg/t.TOC and its increasing pressure action from hydrocarbon-generation expanding can offer enough energy for oil primary migration(hydrocarbon-expulsion).The kerogen network system and the pore-fracture system constitute a three-dimensional network system for the migration.The continuous oil phase is the main phase of primary migration.The intense compaction before the oil shale section matured and generated oil do not have any effect on the hydrocarbon-expulsion efficiency,on the contrary,the lower residual porosity reduces the capacity to occlude hydrocarbon, which is helpful to enhance hydrocarbon-expulsion efficiency(the average reaches 72%) and makes the high-class source rock have the good quality fluid with high hydrocarbon and low water.This provides advantageous conditions for crude oil concentration of low permeability reservoir.