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现代地质 ›› 2010, Vol. 24 ›› Issue (5): 934-944.

• 石油地质 • 上一篇    下一篇

陆相断陷盆地深部碎屑岩成岩演化及控制因素:以东营断陷盆地古近系孔店组为例

谭先锋1,2  ,田景春 ,林小兵 ,张守鹏3   

  1. 1.成都理工大学 油气地质及开发工程国家重点实验室,四川 成都610059;2.重庆科技学院 石油与天然气工程学院,重庆404331;
    3.胜利油田 地质科学研究院,山东 东营257015
  • 出版日期:2010-09-24 发布日期:2012-03-28
  • 作者简介:谭先锋,男,讲师,博士研究生,1982年出生,沉积学专业,主要从事沉积地质学研究。 Email:xianfengtan8299@163.com。
  • 基金资助:

    重庆市自然科学基金项目(CSTC2009BB7383);中国石化重点科技攻关项目(20070300187)

Diagenetic Evolution and Controlling Factors of Deepseated Clastic Rocks in Terrestrial Fault-depressed Basin:Taking the Kongdian Formation of Dongying Fault-depressed Basin for Example

 TAN  Xian-Feng1,2 , TIAN  Jing-Chun, LIN  Xiao-Bing, ZHANG  Shou-Peng3   

  1. 1. State Key Laboratory for Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu,
    Sichuan610059, China;  2.Chongqing University of Science and Technology,Chongqing404331,China;
    3.Geologic Scientific Research Institute of  Shengli Oilfield, Dongying,Shandong257015,China
  • Online:2010-09-24 Published:2012-03-28

摘要:

通过岩石薄片、扫描电镜、镜质体反射率、X衍射、物性分析等资料,对东营断陷盆地古近系孔店组成岩演化及控制因素进行详细研究。研究结果表明:东营断陷盆地孔店组典型成岩现象有强烈压实作用、硬石膏胶结、多期次碳酸盐胶结、多期次粘土矿物胶结、硅质强烈胶结、矿物强烈穿插交代、碎屑颗粒和胶结物的溶解作用;其中,压实作用是引起深部碎屑岩强烈致密化的主要原因;硬石膏胶结、碳酸盐胶结、硅质胶结是引起致密化的又一重要原因;长石、碳酸盐胶结物的溶解作用是引起该地区储层改善的主要成岩因素;成岩演化经历了准同生期-中成岩B期,部分达到晚成岩期的演化过程,成岩演化过程控制了深部碎屑岩孔隙演化;并推断原始干旱-半干旱沉积环境、基准面变化、深埋藏环境、构造-岩浆活动是控制成岩及孔隙演化的主要因素。

关键词: 深部碎屑岩, 成岩矿物, 成岩演化, 控制因素, 孔店组, 断陷湖盆, 东营

Abstract:

Based on the analysis of thin-section analysis, scan electricity microscope observation,vitrinite reflectance,X-diffraction and physical quality analysis,the diagenetic evolution and controlling factors of Kongdian Formation in Dongying sag have been detailly researched. It is indicated that the typical diagenetic phenomenon include the intensive compaction,anhydrite cementation,multiperiod carborate cementation, multiperiod clay minerals cementation, intensive siliceous cement,intensively interpenetration replacement between minerals,solution of clastic and cementation.  The conclusion has been verified that compaction is the main cause of high pyknosis of the deep-seated clastic rocks, another cause is the cementation of anhydrite, carborate and siliceous. Solution of feldspar and carbonate cementation are the main diagenetic cause of improving the reservoir. Diagenetic evolution experiences the penecontemporaneousmiddle diagenetic stage B,part of it reaches the late diagenetic stage. The diagenetic evolution controls the pore evolution. It has been discussed that ariditysemiarid depositional environment,locating surface variation,deep-burial,and tectonic-magma activity are the key factors of controlling the diagenetic evolution and pore evolution.

Key words: deepseated clastic rock, diagenetic mineral, diagenetic evolution, controlling factor, Kongdian Formation, fault-depressed basin;Dongying

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