地学前缘 ›› 2012, Vol. 19 ›› Issue (2): 110-120.

• 论文 • 上一篇    下一篇

塔河岩溶型碳酸盐岩缝洞系统流体动态连通性研究

 康志宏, 陈琳, 鲁新便, 杨敏   

  1. 1. 中国地质大学（北京） 能源学院 海相油藏储层实验室， 北京 100083 2. 中国石化 西北油田分公司 勘探开发研究院， 新疆 乌鲁木齐 830011 3. 中国石化 西北油田分公司 采油三厂， 新疆 乌鲁木齐 830011  
  • 收稿日期:2011-12-05 修回日期:2012-02-18 出版日期:2012-03-25 发布日期:2012-03-25
  • 作者简介:康志宏（1966—），男，教授级高级工程师，石油与天然气工程专业。E-mail:kangzh98@163.com
  • 基金资助:

    国家十二五科技重大专项“复杂油气藏精细表征及剩余油分布预测”（2011ZX05009003）

Fluid dynamic connectivity of karst carbonate reservoir with fracture & cave system in Tahe Oilfield.

 KANG  Zhi-Hong, CHEN  Lin, LU  Xin-Bian, YANG  Min   

  1. 1. Marine Reservoir Laboratory, School of Energy Resources, China University of Geosciences（Beijing）, Beijing 100083, China 2. Exploration and Production Institute of Northwest Oilfield Branch, Sinopec, Urümqi 830011, China 3. Oil Producing No.3 Region of Northwest Oilfield Branch, Sinopec, Urümqi 830011, China
  • Received:2011-12-05 Revised:2012-02-18 Online:2012-03-25 Published:2012-03-25

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摘要：

塔里木盆地塔河油田下奥陶统碳酸盐岩储集体属于表生岩溶作用形成的喀斯特缝洞系统。其储集体孔隙空间类型主要为与原始组构无关的连通孔洞，其孔隙系统由岩溶洞穴、溶蚀裂缝和溶蚀孔三大类型的储集空间复合而成。油田开发实践证实，油藏呈现出多压力系统、差异连通的特征。文中针对缝洞型碳酸盐岩连通缝洞孔隙系统的特征，分析了区别于分散型碳酸盐岩储集体的特征。基于油藏的孔洞系统复杂的特点，说明利用各类动态资料对油藏储层缝洞体研究十分重要。通过动态研究方法，推测喀斯特缝洞系统中的连通体——“缝洞单元”。笔者提出了利用动态信息分析油藏之间缝洞连通性的研究思路和方法:（1）同一缝洞单元内，单井地层压力趋势下降相似；（2）井间干扰系统测试是较直接的连通确定方法；（3）开发井生产异常，导致同一缝洞单元相邻井出现相应动态变化；（4）注水井的示踪剂注入，检测邻近井检测示踪剂的含量、受效时间等，判断井间的连通级别；（5）不通缝洞单元的流体组分、密度和粘度等存在差异。结合塔河油田实际资料，共划分了42个缝洞单元，认为缝洞储集体的分布与岩溶古地貌、古水系和断裂带有一定的吻合性。

关键词: 塔河油田, 碳酸盐岩储集体, 岩溶油藏, 缝洞系统, 动态连通, 流动单元

Abstract:

The Lower Ordovician carbonate reservoir in Tahe Oilfield is a large fracture & cave system formed by supergene karstification. The reservoir pore space of Tahe Oilfield mainly consisted of touchingvugs such as fractures related with karst cavities and pores. The exploration and production of oilfield proved that reservoirs have different connectivity and multipressure system. Based on the characteristics that the carbonate reservoir connected with fracturecavity system, this article analyzed the features different from discrete carbonate reservoir. Approach on the complicated features of the fracture & cave reservoir which are different from sand reservoir, the authors pointed out emphatically that variable dynamic data are very significant for the research on the connectivity of fracture & cave reservoir. By the study on dynamic data the author inferred the “fracture & cave unit” in the karst reservoir, and put forward the research ideas and methods that how to use dynamic data to study on the connectivity of the reservoir. Then the author concluded: (1)in the same fracture & cave system, every well is similar in pressure drop; (2)interwell interference analysis can make sure the connectivity immediately; (3)the changes of development well lead to dynamic changes of other wells in the same flowage unit; (4)connectivity grade can be divided by testing the tracer material in the wells which nearby the tracer injector and making sure how long the wells are affected; and (5) the fluid in different fracture & cave system is variable in composition, density and viscosity. In the end, according to the factual data of Tahe Oilfield, 42 fracture & cave units are recognized, and the author considered that the distribution of the reservoir is in accordance to karst palaeogeomorphology, palaeodrainage pattern and fault zone.

 

Key words: Tahe Oilfield, carbonate reservoir, karst reservoir, fracture &, cave system, dynamic connectivity, flowage units

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