渤海湾盆地东营凹陷东段红层储层成岩环境时空演化及成岩孔隙演化

doi:10.11743/ogg20170110

Abstract

Abstract:

Diagenetic environment is one of the vital factors to control pore types and evolutionary process of the red beds.On the basis of a great amount of microscopic thin section combining with ‘elemental geochemical index quantifiable forward modeling’ and ‘diagenetic product type and quantifiable inversion’,Temporal-spatial evolution of diagenetic environments are qualitatively analyzed in red beds of the eastern Dongying Sag,and diagenetically reformed pore volumes are quantitatively described.Additionally,pore evolution models under the control of multiple diagenetic environments are established in red beds.The results show that diagenetic environments in red beds can be divided into original alkaline environment and burial acidic environment owing to primary depositional environment,organic acid and hydrocarbon injection period at temporal dimension.On the plane view,with alkaline water released by saline lake areas and changes of organic acid concentration along with the migration distance,diagenetic environment can be divided into four parts from lake area to sag margin:moderate strong alkalinity-weak acidity,moderate-strong alkalinity-weak acidity,weak alkalinity-moderate-strong acidity,weak alkalinity-weak acidity.Due to the spatial variation of diagenetic environment,the degree of original pore reduction and secondary pore generation are obviously different in different tectonic positions,which in turn leads to diversified reservoir space types and significant porosity difference red beds in the eastern Dongying Sag.

Key words: diagenetic reformed pore volume, pore evolution, diagenetic environment, red bed, Dongying Sag, Bohai Bay Basin

CLC Number:

TE122.2

Li Jiyan. Temporal-spatial evolution of diagenetic environment and diagenesis pore evolutionary process of red beds in the eastern Dongying Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2017, 38(1): 90-97.

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Temporal-spatial evolution of diagenetic environment and diagenesis pore evolutionary process of red beds in the eastern Dongying Sag, Bohai Bay Basin

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