Differential Diagenesis and Its Genetic Analysis of 1st Member of Funning Formation in Gaoyou Depression

Abstract:

It is found that the diagenetic minerals are quite similar in reservoirs that are undergoing different stages of diagenesis for 1st member of Funning Formation in Gaoyou Depression. The principle of differential diagenesis was summarized up through the research of diagenetic stage and minerals considering the tectonic structures and fluid in the depression. When the formation dip angle is small, formations of the same age will be at the same stage of diagenesis, early diagenetic minerals will be preserved in late diagenetic stage; when the formation dip angle is large, different diagenetic stages will be conducted in formations of the same age, deep seated diagenetic fluid may upwell, leading to late diagenetic minerals precipitate in shallow buried reservoir that early diagenetic stage dominates.