Sandbody Genesis and Hydrocarbon Accumulation Mechanism of Beach-Bar Reservoir in Faulted-Lacustrine-Basins: A Case Study from the Upper of the Fourth Member of Shahejie Formation, Dongying Sag

详细信息   

• 责任者：Wang Yongshi (Geological Research Institute ; Shengli Oilfield Company ; SINOPEC ; Dongying 257000 ; China) ; Liu Huimin
• 刊名：Earth Science Frontiers
• 出版年：2012
• 卷期：19(1)
• 关键词：砂体 ; sand bodies ; 成藏模式 ; pool-formed model ; 东营凹陷 ; Dongying Sag
• 页码：p.100-107
• 图表：9 illus., 26 refs.
• 分类号：1003
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

摘要

 Beach-bar sandstone is thin and interbedded sediment that was widely developed in the high-energy shallow-shore lake environment.No enough attention has been paid to it and the exploration degree is very low.Focused on the research difficulties of beach-bar sandstone causes and oil accumulation in the upper of Es4 of Dongying Sag,this paper studies sedimentary characteristics,oil-forming factors and enriched regular pattern of beach-bar sandstone.It was suggested that the beach-bar sandstone deposition was controlled by palaeo-geomorphology,palaeo-current and palaeo-base level(three palaeo-controlling sandstone mechanism),while oil accumulation was controlled by faults and fractures,effective reservoir and overpressure of source rocks(three factor-controlling oil accumulation mechanism).Long-term palaeo-base level rising and short-term frequent palaeo-base level concussion formed the widespread beach-bar sandstone deposition.The"pressuresuck filling"caused by overpressure of source rocks and the water consumption and pressure reduction during the diagenetic process resulted in the widely bearing oils in the beach-bar sandstones.