石油学报 ›› 2017, Vol. 38 ›› Issue (12): 1390-1400.DOI: 10.7623/syxb201712006

• 地质勘探 • 上一篇    下一篇

湖相泥页岩中碳酸盐成因及页岩油气地质意义——以东营凹陷沙河街组四段上亚段—沙河街组三段下亚段烃源岩为例

王勇1, 刘惠民2, 宋国奇2, 郝雪峰1, 朱德顺1, 朱德燕1, 丁桔红1, 杨万芹1, 银燕1   

  1. 1. 中国石油化工股份有限公司胜利油田分公司勘探开发研究院 山东东营 257015;
    2. 中国石油化工股份有限公司胜利油田分公司 山东东营 257001
  • 收稿日期:2017-02-24 修回日期:2017-09-14 出版日期:2017-12-25 发布日期:2018-01-05
  • 通讯作者: 王勇,男,1977年9月生,2002年获湖南科技大学学士学位;2008年获中国科学院广州地球化学研究所博士学位,现为中国石油化工股份有限公司胜利油田分公司高级工程师,主要从事石油天然气地质综合研究及油气勘探工作。Email:wangyong731.slyt@sinopec.com
  • 作者简介:王勇,男,1977年9月生,2002年获湖南科技大学学士学位;2008年获中国科学院广州地球化学研究所博士学位,现为中国石油化工股份有限公司胜利油田分公司高级工程师,主要从事石油天然气地质综合研究及油气勘探工作。Email:wangyong731.slyt@sinopec.com
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2014CB239100)资助。

Carbonate genesis and geological significance of shale hydrocarbon in lacustrine facies mud shale: a case study of source rocks in the upper submember of Member 4 and lower submember of Member 3 of Shahejie Formation, Dongying sag

Wang Yong1, Liu Huimin2, Song Guoqi2, Hao Xuefeng1, Zhu Deshun1, Zhu Deyan1, Ding Juhong1, Yang Wanqin1, Yin Yan1   

  1. 1. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Shandong Dongying 257015, China;
    2. Sinopec Shengli Oilfield Company, Shandong Dongying 257001, China
  • Received:2017-02-24 Revised:2017-09-14 Online:2017-12-25 Published:2018-01-05

摘要:

利用岩心、薄片、全岩矿物组分、元素、同位素等资料,对东营凹陷沙河街组四段上亚段—沙河街组三段下亚段深湖相烃源岩中碳酸盐成因机理进行了研究,认为深湖主要发育透镜状粗晶、纹层状微细晶、纹层状隐晶和块状隐晶4种类型碳酸盐。其中,透镜状粗晶碳酸盐为成岩重结晶的产物;纹层状微细晶碳酸盐和纹层状隐晶碳酸盐为藻类光合作用不断从水中萃取CO2,导致水体CO32-浓度升高,与湖水表层携带的Ca2+相互作用的产物,咸水环境有利于碳酸盐晶粒保存,碳酸盐多呈微细晶纹层状分布,微咸水环境水体较深,碳酸盐晶粒在碳酸盐补偿深度面以下通常会发生溶蚀,大多呈隐晶纹层状保存下来;块状隐晶碳酸盐是浅水地带沉积碳酸盐由重力流搬运至深水地带的产物。碳酸盐一定程度上控制了东营凹陷沙河街组四段上亚段—沙河街组三段下亚段泥页岩的储集性和可压性,也将为古湖泊沉积环境恢复提供重要信息。

关键词: 碳酸盐, 成因机理, 重结晶, 光合作用, 沉积环境

Abstract:

The genetic mechanism of carbonate in the deep lacustrine facies source rocks of the upper submember of Member 4 and lower submember of Member 3 of Shahejie Formation, Dongying sag is studied based on data involving cores, thin sections, whole-rock mineral components, elements and isotopes. It is considered that there are four kinds of carbonate developed in the deep lake, i.e., lenticular coarse crystalline, lamellar micro-fine crystalline, lamellar cryptocrystalline and massive cryptocrystalline. Among them, the lenticular coarse crystalline carbonate is the product of diagenetic recrystallization. The lamellar micro-fine crystalline carbonate and lamellar cryptocrystalline are generated by algal photosynthesis, i.e., CO2 is constantly extracted from water, thus leading to that the CO32- is increased in water and then interacts with Ca2+ carried by lake water surface. Saline water environment is favorable to the preservation of carbonate particles, where the carbonates are mostly shown as micro-fine crystalline with the lamellar distribution. In the brackish water environment, the water is deeper, and dissolution usually occurs to the carbonate crystalline beneath the carbonate compensation depth surface, where most lamellar cryptocrystalline are preserved. The massive cryptocrystalline carbonate is the product of the sedimentary carbonate in the shallow water migrating to deep water by gravity flow. The reserving property and compressibility of mud shale in the upper submember of Member 4 and lower submember of Member 3 of Shahejie Formation, Dongying sag are controlled by carbonate, providing important information for the restoration of paleo-lake sedimentary environment.

Key words: carbonate, genetic mechanism, recrystallization, photosynthesis, sedimentary environment

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