ORGANOPHILIC PORES AS PROPOSED PRIMARY MIGRATION MEDIA FOR HYDROCARBONS IN ARGILLACEOUS ROCKS
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概要
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A chemical model for the structure of the double layer in the presence of organic ions and molecules in the vicinity of clay surfaces is postulated. The validity of this model is examined in the light of known literature on the interaction between clay minerals and organic compounds. The probability of the penetration of organic ions and molecules into the inner Helmholtz layer is discussed. The effect of migrating water on the migration of hydrophilic and hydrophobic organic compounds through a rock is discussed. The rate of migration of organic compounds depends on their chemical nature as well as the nature of the rock. From the model on the stability of the double layer it may be concluded that amphipathic molecules (soaps) are carried with migrating water from pores where their surface density is low to pores where their surface density is high. There is a probability of a complete saturation of several of the pores with organic ions or polar molecules. Such a pore is defined as an"organo-pore"and is shown to be hydrocarbon permeable. Organo-pores may become the paths for primary migration of hydrocarbon in the argillaceous source rock.
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