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Diagenetic evolution of Es3 reservoir and its influence on property in the northern Minfeng sub sag of Dongying sag
CAO Ying chang1, CHEN Lin1,2, WANG Yan zhong1, SUI Feng gui1,2
(1.School of Geosciences in China University of Petroleum, Qingdao 266555, China;2.Western New Prospect Research Center, Shengli Oilfield, Dingying 257015, China)
Abstract:
Through the analysis of lots of rock thin sections of Es3 formation in the northern Minfeng sub sag of Dongying sag, combined with the homogenization temperature analysis of fluid inclusion and burial history, the process of diagenetic evolution and its influence on the reservoir property were studied. The diagenetic sequence is:from the beginning of the deposition of Es3 to 38 Ma ago, the main type of diagenesis is compaction; from 38 to 32 Ma ago, the first phase of acid dissolution; from 32 to 25 Ma ago, quartz dissolution/ carbonate cementation and the first phase of hydrocarbon filling; from 25 to about 2 Ma ago, the second phase of acid dissolution and hydrocarbon filling; about 2 Ma ago, the later carbonate cementation; from 2 Ma ago until now, the third phase of acid dissolution and hydrocarbon filling. Among them,compaction, carbonate cementation, acid dissolution and former hydrocarbon filling exert the most important effect on the evolution of reservoir physical property. The first phase of hydrocarbon filling occurred in the early and medium stage of carbonate cementation, which hindered the carbonate cementation, and the porosity would be preserved. If hydrocarbon filling didn 't occur or the hydrocarbon filling was not enough, carbonate cementation would be intensive, and the property would be poor.
Key words:  diagenesis evolution  Es3  north of Minfeng sub sag  Dongying sag