石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (1): 90-97.doi: 10.11743/ogg20170110

• 油气地质 • 上一篇    下一篇

渤海湾盆地东营凹陷东段红层储层成岩环境时空演化及成岩孔隙演化

李继岩1,2   

  1. 1. 中国石化 胜利油田分公司 勘探开发研究院, 山东 东营 257000;
    2. 中国石化 胜利油田分公司 博士后流动工作站, 山东 东营 257000
  • 收稿日期:2016-03-07 修回日期:2016-09-23 出版日期:2017-02-28 发布日期:2017-02-27
  • 作者简介:李继岩(1987-),男,博士后,油气资源勘探理论与技术。E-mail:ljy19870817@163.com。
  • 基金资助:

    国家油气科技重大专项（2011ZX05006-003）。

Temporal-spatial evolution of diagenetic environment and diagenesis pore evolutionary process of red beds in the eastern Dongying Sag, Bohai Bay Basin

Li Jiyan1,2   

  1. 1. Research Institute of Petroleum Exploration & Development, Shengli Oilfield Company, SINOPEC, Dongying, Shandong 257000, China;
    2. Working Stations for Post Doctors, SINOPEC, Dongying, Shandong 257000, China
  • Received:2016-03-07 Revised:2016-09-23 Online:2017-02-28 Published:2017-02-27

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摘要：

成岩环境是控制红层储层孔隙类型及演化过程的重要因素之一。在大量镜下薄片鉴定的基础上，利用“元素地球化学指标正演”与“成岩产物类型及数量反演”相结合的研究方法，定性分析了渤海湾盆地东营凹陷东段红层储层成岩环境时空演化规律，定量表征了成岩改造孔隙量，分带建立了多重成岩环境控制下的红层储层孔隙演化模式。结果表明：时间上，由于原始沉积环境、有机酸和烃类注入时期的控制，红层储层成岩环境可划分为原始碱性和埋藏酸性两个变化阶段；平面上，由于盐湖区释放碱性水及有机酸浓度随运移距离的变化，自湖盆区向凹陷边缘可划分为4个成岩环境变化带：中强碱性-弱酸性带、中强碱性-强酸性带、弱碱性-中强酸性带、弱碱性-弱酸性带。受控于成岩环境平面变化规律，在不同构造部位原生孔隙降低和次生孔隙增加的幅度具有明显差异，从而导致东营凹陷东段红层储层储集空间类型多样、孔隙度差异明显。

关键词: 成岩孔隙改造量, 孔隙演化, 成岩环境, 红层, 东营凹陷, 渤海湾盆地

Abstract:

Diagenetic environment is one of the vital factors to control pore types and evolutionary process of the red beds.On the basis of a great amount of microscopic thin section combining with ‘elemental geochemical index quantifiable forward modeling’ and ‘diagenetic product type and quantifiable inversion’,Temporal-spatial evolution of diagenetic environments are qualitatively analyzed in red beds of the eastern Dongying Sag,and diagenetically reformed pore volumes are quantitatively described.Additionally,pore evolution models under the control of multiple diagenetic environments are established in red beds.The results show that diagenetic environments in red beds can be divided into original alkaline environment and burial acidic environment owing to primary depositional environment,organic acid and hydrocarbon injection period at temporal dimension.On the plane view,with alkaline water released by saline lake areas and changes of organic acid concentration along with the migration distance,diagenetic environment can be divided into four parts from lake area to sag margin:moderate strong alkalinity-weak acidity,moderate-strong alkalinity-weak acidity,weak alkalinity-moderate-strong acidity,weak alkalinity-weak acidity.Due to the spatial variation of diagenetic environment,the degree of original pore reduction and secondary pore generation are obviously different in different tectonic positions,which in turn leads to diversified reservoir space types and significant porosity difference red beds in the eastern Dongying Sag.

Key words: diagenetic reformed pore volume, pore evolution, diagenetic environment, red bed, Dongying Sag, Bohai Bay Basin

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