新疆石油地质

新疆石油地质 ›› 2011, Vol. 32 ›› Issue (3): 253-256.

• 油气勘探 • 上一篇    下一篇

塔中地区礁滩体风化壳岩溶及其对储集层的影响

张云峰1, 张海祖2, 孙崇浩1,2, 吉云刚2, 韩杰2, 张勇2   

  1. 1.西南石油大学资源与环境学院,成都 610500;
    2.中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒 841000
  • 收稿日期:2010-10-19 出版日期:2011-06-01 发布日期:2020-08-14
  • 作者简介:张云峰（1982-）,男,河南周口人,在读博士研究生,石油地质,（E-mail）zhangyunfeng_128@yahoo.com.cn.
  • 基金资助:
    国家科技重大专项（208ZX05049）

The Reef-Flat Weathering Crust Karst and Its Effect on Reservoirs in Tazhong Area, Tarim Basin

ZHANG Yun-feng1, ZHANG Hai-zu2, SUN Chong-hao1,2, JI Yun-gang2, HAN Jie2, ZHANG Yong2   

  1. 1. College of Resources and Environment, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Research Institute of Exploration and Development, TarimOilfield Company, PetroChina, Korla, Xinjiang 841000, China
  • Received:2010-10-19 Online:2011-06-01 Published:2020-08-14

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摘要： 塔中地区上奥陶统碳酸盐岩未经中-深埋藏成岩环境就直接暴露,矿物未经过完全稳定转化,因此其风化壳岩溶兼具晚成岩近地表岩溶及准同生岩溶特点：发育非组构选择性溶蚀的溶缝、大型溶洞及组构选择性溶蚀的孔洞、铸模孔、粒内溶孔。风化壳岩溶垂向上可分为表层岩溶带、垂向渗滤溶蚀带、径流溶蚀带和潜流溶蚀带,作用厚度一般小于100 m,其发育程度受礁滩体微地貌和海平面变化的控制。风化壳岩溶作用进一步扩大了早期成岩作用形成的孔洞层规模,并在顶部形成了一系列新的缝洞体,使得良里塔格组礁滩型古地貌高点及距顶100 m 范围内为优质储集层发育层位。

关键词: 塔里木盆地, 上奥陶统, 碳酸盐岩储集层, 风化壳岩溶, 识别标志

Abstract: The carbonate weathering crust of the Upper Ordovician in Tazhong area is characterized by both late diagenetic and near-surfacial karst and penecontemporaneous karst for its outcrop without middle-deep burial or diagenetic environment and its minerals without completely stable conversion, namely, showing non-fabric selectivity dissolved fractures and large caves as well as fabric selectivity dissolved vugs, cast pores and intragranular dissolved pores. In vertical, the crust karst can be divided into superfacial karst zone, vertical percolation dissolved zone, radial flowdissolved zone and groundwater flowzone, with acting thickness of less than 100 m, controlled by reef-flat micro-relief and sea level variation in development. The vuggy layer scale formed by early diagenesis is more expanded by the weathering crust karstification, shaping several new fracture-vug bodies at the top. It is suggested that quality reservoir developed horizons may appear in the reef-flat paleo-relief highs of Lianglitag formation and within 100 mfromthe top.

Key words: Tarimbasin, Upper Ordovician, carbonate reservoir, weathering crust karst, identification mark

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