东营凹陷东段始新统红层储层多重成岩环境及演化模式

doi:10.11743/ogg20140511

摘要/Abstract

摘要：

为了探讨成岩环境对红层储层成岩演化的控制作用，利用埋藏史恢复、薄片鉴定、扫描电镜观察、岩心常规分析等多种技术手段，运用“正演与反演”、“定性与定量”相结合的研究方法，分析了渤海湾盆地东营凹陷东段始新统红层储层成岩环境，表征了成岩作用强度，建立了多重成岩环境控制下的红层储层成岩改造模式。结果表明，根据成岩环境控制因素、影响范围和性质类型的差异性，将东营凹陷东段始新统红层储层成岩环境划分为原始碱性和埋藏酸性两个阶段，分别对应准同生期-早成岩A期、早成岩B期-中成岩A期。受控于成岩环境的差异性，不同成岩阶段成岩产物及强度差异性明显，在定量表征成岩强度的基础上，最终建立了红层储层碱性—弱酸性—中强酸性成岩环境控制的早期强胶结、弱溶蚀-中晚期中等溶蚀、弱压实的储层成岩改造模式，该模式控制下红层储层具有“早期原生孔隙快速下降、次生孔隙缓慢增长，中晚期次生孔隙迅速增大，原生孔隙缓慢下降”的孔隙演化模式。

关键词: 红层, 成岩环境, 成岩演化, 东营凹陷, 渤海湾盆地

Abstract:

In order to investigate the control of diagenetic environment on diagenetic evolution of red-beds reservoir,we studied the diagenetic environments of the Eocene red-beds in the eastern Dongying Sag Bohai Bay Basin through burial history reconstruction,thin section analysis,scanning electron microscopic observation,routine core analyses.On this basis,we described intensity of diagenesis and established evolutionary patterns of red-bed reservoirs under the control of diagenetic environment.The diagenetic environment of the Eocene red-beds in the eastern Dongying Sag is divided into two types according to the differences of control factor,range of influence and property types,namely original alkaline environment and burial acidic environment,which correspond to penecontemporaneous period-early diagentic stage A,early diagentic stage B-middle diagenetic stage A respectively.The diversity in diagenetic products and intensity is sharp due to the differences of diagentic environment.A diagenetic modification model of the Eocene red-beds reservoir was established based on quantitative description of diagenetic intensity,namely "early strong cementation and weak dissolution-middle and late moderate dissolution and weak compaction" under the control of diagenetic environment with alkality to weak acidity-moderate-strong acidity.Red bed reservoirs under the control of this model feature in a pore evolutionary pattern of "rapid-decreasing of primary porosity,slow-growing of secondary porosity in early stage;slow-decreasing of primary porosity,rapid-growing of secondary porosity in middle and later stages".

Key words: red-bed, diagenetic environment, diagenetic evolutionary process, Dongying Sag, Bohai Bay Basin

中图分类号:

TE122.2

牛栓文,李继岩. 东营凹陷东段始新统红层储层多重成岩环境及演化模式[J]. 石油与天然气地质, 2014, 35(5): 661-669. doi: 10.11743/ogg20140511 Niu Shuanwen,Li Jiyan. Multiple diagenetic environments and evolutionary patterns of the Eocene red beds in the eastern Dongying Sag[J]. Oil & Gas Geology, 2014, 35(5): 661-669. doi: 10.11743/ogg20140511

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