• 责任者：Wang Yanzhong (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Cao Yingchang
• 刊名：Acta Petrolei Sinica
• 出版年：2013
• 卷期：34(6)
• 关键词：碎屑岩储集层 ; clastic reservoirs ; 孔隙度 ; porosity ; 东营凹陷 ; Dongying Sag
• 页码：p.1100-1111
• 图表：10 illus., 2 tables, 34 refs.
• 分类号：1003
• issnNo：ISSN0253-2697
• isbnNo：CN11-2128/TE

     A matching relationship between porosity evolution history of clastic reservoirs with mid-deep burial （〉3 500 m） and hydro carbon expulsion history of source rocks is the key control over hydrocarbon accumulations, especially for a deeply-buried clastic reservoir that has experienced complex reforms of diagenesis with geological time, therefore, its porosity evolution is so complicated that real porosity recovery of reservoir with geological time is of great difficulty. Taking pebbled sandstones and sandstone reservoirs in the middle fan subfacies of deep nearshore subsea aprons in the upper part of the fourth member of the Shahejie Formation （Es4^5） in the northern zone of the Minfeng sag in the Dongying depression as an example, diagenetic cementation-dissolution sequences and evolutionary sequences of diagenetic fluid properties of a reservoir, as well as occurrence time of each diagenesis and corresponding palaeoburial depth of the reservoir were determined. Then a functional relationship between plane porosity of casting thin sections and apparent porosity of the reservoir was fitted and positive or negative contribution of various secondary pores and authigenic rain erals to variations in reservoir porosity was calculated using casting thin sections, and porosity inversion and back stripping with a constraint of cementation-dissolution sequences were carried out. Meanwhile, according to a normal compaction chart of different types of rocks, the inversed and back-tripped porosity was calibrated by mechanical compaction and thermal compaction in order to reconstruct a real porosity of the reservoir and establish its real porosity-evolution curve versus geological time （or palaeoburial depth）. The combination of the reservoir porosity evolutionary history obtained by this method with hydrocarbon generating and expulsing history of source rocks can provide practical guidance for prediction of mid-deep buried clastic reservoirs in hydrocarbon en richment areas.