石油勘探与开发 >

2020 , Vol. 47 >Issue 6: 1134 - 1148

DOI: https://doi.org/10.11698/PED.2020.06.07

油气勘探

四川盆地西北部二叠系栖霞组准同生期砂糖状白云岩特征及成因

  • 芦飞凡 ,
  • 谭秀成 ,
  • 钟原 ,
  • 罗冰 ,
  • 张本健 ,
  • 张亚 ,
  • 李明隆 ,
  • 肖笛 ,
  • 王小芳 ,
  • 曾伟
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  • 1.油气藏地质及开发工程国家重点实验室 西南石油大学,成都 610500;
    2.中国石油集团碳酸盐岩储层重点实验室西南石油大学研究分室,成都 610500;
    3.中国石油西南油气田公司勘探开发研究院,成都 610041;
    4.中国石油西南油气田公司川西北气矿,四川江油 621741;
    5.表生地球化学教育部重点实验室 南京大学地球科学与工程学院,南京 210023;
    6.中国石油杭州地质研究院,杭州 310023
芦飞凡（1993-）,男,满族,天津人,博士,主要从事沉积学与油气储集层地质学方面研究。地址：四川省成都市新都区西南石油大学,邮政编码：610500。E-mail：lufeifanbh@163.com

收稿日期: 2020-02-28

  修回日期: 2020-11-05

  网络出版日期: 2020-11-27

基金资助

“十三五”国家科技重大专项（2016ZX05004002-001）; 国家自然科学基金（41802147）; 中国石油-西南石油大学创新联合体科技合作项目

收起

Origin of the penecontemporaneous sucrosic dolomite in the Permian Qixia Formation, northwestern Sichuan Basin, SW China

  • LU Feifan ,
  • TAN Xiucheng ,
  • ZHONG Yuan ,
  • LUO Bing ,
  • ZHANG Benjian ,
  • ZHANG Ya ,
  • LI Minglong ,
  • XIAO Di ,
  • WANG Xiaofang ,
  • ZENG Wei
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. Department of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu 610500, China;
    3. Institute of Petroleum Exploration and Exploitation, PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    4. Northwest Sichuan Gas Mine, PetroChina Southwest Oil and Gas Field Company, Jiangyou 621741, China;
    5. Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
    6. PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China

Received date: 2020-02-28

  Revised date: 2020-11-05

  Online published: 2020-11-27

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摘要

针对四川盆地西北部二叠系栖霞组的砂糖状白云岩储集层,对其特征、形成时间和成因进行了判识和分析。通过钻井岩心和野外剖面的详细描述及显微镜下分析,发现其具有区别于其他白云岩的典型特征：①白云石晶粒级别一般为中-粗晶,且常与粉-细晶白云岩和岩溶系统充填物白云岩伴生;②在向上变浅序列中上部发育典型的早成岩期岩溶识别标志;③中-粗晶砂糖状白云岩被早成岩期岩溶组构切割,表现为白云石具溶蚀边,孔洞中充填渗流白云石粉屑,中-粗晶白云石晶间为后期海侵期黏土充填。分析认为,这类中-粗晶白云岩形成时间为早成岩期岩溶之前。结合砂糖状白云岩具亮色环带的阴极发光特征、较高的包裹体温度、显著负偏移的碳氧同位素组成特征和类似海水的稀土元素配分形态分析,这类偶具雾心亮边的砂糖状白云岩经历了蒸发海水回流渗透和坡折带地形控制的准同生期海水循环热液白云石化两期白云石化过程。研究结果不仅更新了对栖霞组白云石化时间的认识,说明在海水循环热液叠加的准同生期也可形成中-粗晶的砂糖状白云岩,同时表明东吴期张裂活动始于早二叠世,也因坡折带地形和丘滩叠置迁移控制的砂糖状白云岩具有规模带状分布特征,而为拓展该类储集层的勘探领域提供了重要的支撑。表1参43

关键词： 砂糖状白云岩; 准同生期白云石化; 海水循环热液; 早成岩期岩溶; 栖霞组; 二叠系; 四川盆地

本文引用格式

芦飞凡 , 谭秀成 , 钟原 , 罗冰 , 张本健 , 张亚 , 李明隆 , 肖笛 , 王小芳 , 曾伟 . 四川盆地西北部二叠系栖霞组准同生期砂糖状白云岩特征及成因[J]. 石油勘探与开发, 2020 , 47(6) : 1134 -1148 . DOI: 10.11698/PED.2020.06.07

Abstract

The characteristics, formation time, and orgin of the sucrosic dolomite reservoirs in the Permian Qixia Formation of northwestern Sichuan Basin are analyzed. Core and outcrop description and microscopic analysis of the sucrosic dolomite samples are carried out. It is found that the dolomite has typical features different from other kinds of dolomites: (1) This dolomite is generally medium-coarse in crystal size, and often associated with fine to silt-size crystalline dolomite and cave-filling dolomite. (2) Typical identification marks of eogenetic karstification are developed at the top of the upward-shallowing sequence. (3) The medium-coarse crystalline sucrosic dolomite is cut by the early diagenetic karst fabric, and is characterized by dolomite with dissolution edge, dolomite vadose silt in pores, and transgression clay filling between the medium-coarse dolomite crystals. The medium-coarse crystalline sucrosic dolomite was formed earlier than the eogenetic karstification. The sucrosic dolomite with occasional cloudy core and clear rim has bright cathodoluminescence, high inclusions temperature, significant negative skewness carbon and oxygen isotopic compositions, and REE pattern similar to seawater, indicating it experienced two periods of dolomitization, evaporative seawater seepage-reflux and penecontemporaneous seawater cyclic hydrothermal fluid dolomitization. The study results not only update the understanding on the dolomitization time of Qixia Formation, demonstrate that the sucrosic dolomite can be formed in the penecontemporaneous stage when seawater reflux superimposed with hydrothermal fluid effects, but also show that the taphorogenesis in the Dongwu period began in the Early Permian. Moreover, the dolomite controlled by the grain bank migration and terrain in the slope break appears in bands of large scale, this knowledge provides basis for expanding the exploration field of this type of reservoirs.

Key words： sucrosic dolomite; penecontemporaneous dolomitization; seawater cyclic hydrothermal fluid; eogenetic karstification; Qixia Formation; Permian; Sichuan Basin

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