Characteristics of hydrothermal fluid activity and its petroleum geological significance in Jiyang Depression
Aiming at the problem that hydrothermal fluid activity signs and hydrocarbon geological significance are not clear in Jiyang Depression,based on the data of thin section,trace element,rare earth element,carbon and oxygen isotopes,and mercury injection test,the author analyzed the development marker of the hydrothermal fluid activity and its geological significance in Jiyang Depression.The results show that hydrothermal fluid activity is developed in Jiyang Depression,a variety of hydrothermal minerals and thermal cataclastic structures are found,the contents of chlorite and illite in sandstones are unusually high,the Co/Ni ratio of pyrite is greater than 1,rare earth elements show obvious Eu positive anomaly,the carbon and oxygen isotope data of the ferrite cement in the sandstone are projected in the epithermal zone.Hydrothermal fluid activity is conducive to forming secondary pores in the reservoir and forming fractured reservoirs and diagenetic traps.These results can enrich and improve the understanding of hydrothermal fluid activity characteristics in petroliferous basins and have a certain guiding significance for the exploration of hydrothermally modified subtle reservoirs.
Jiyang Depressionhydrothermal fluidhydrothermal mineralsclay mineralstrace elementsrare earth elements
万方数据
维普
