岩性油气藏 ›› 2026, Vol. 38 ›› Issue (2): 194–200.doi: 10.12108/yxyqc.20260217

• 石油工程与油气田开发 • 上一篇    

断溶体油藏水侵评价方法——以顺北一区奥陶系一间房组油藏为例

刘洪1(), 张文学2   

  1. 1 东华理工大学 理学院， 南昌 330013
    2 中石化西北油田分公司 采油四厂， 新疆 阿克苏 843000
  • 收稿日期:2025-07-02 修回日期:2025-10-13 出版日期:2026-03-01 发布日期:2025-12-05
  • 第一作者:刘洪（1981—），男，博士，讲师，主要从事油气渗流理论及应用工作。地址：（330013）江西省南昌市经开区广兰大道418号。Email:llhh81@163.com。

Evaluation method for water influx in fault-karst reservoirs: Taking Ordovician Yijianfang Formation reservoir in Shunbei-1 area as an example

LIU Hong1(), ZHANG Wenxue2   

  1. 1 School of Science， East China University of Technology， Nanchang 330013， China
    2 No. 4 Oil Production Plant， Sinopec Northwest Oilfield Branch， Akesu 843000， Xinjiang， China
  • Received:2025-07-02 Revised:2025-10-13 Online:2026-03-01 Published:2025-12-05

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摘要：

塔里木盆地顺北一区断溶体油藏随着累产增加，地层压力呈先下降后回升的非单调变化趋势，这一现象无法用传统水侵模型解释，比较符合渐进式动用特征。基于“逐步动用”思想和物质平衡理论，将水侵过程分为水侵前和水侵后2个阶段，分别建立了动态储量和水体体积评价模型。研究结果表明：①顺北油田奥陶系油藏是典型的断溶体油藏，具有水平窄条带、垂向跨度大的立体成藏模式，受控于NE向走滑断裂系统，一间房组碳酸盐岩储层为“断裂-岩溶”型储集体，物性差，断溶体沿主干断裂连续分布。②研究区断溶体油藏可采用新建立的水侵评价模型计算动态储量、水侵量、动态水体体积，进而计算单井的控制地质储量和水体大小。累产液地下体积-动态储量图版会出现水平段，水平段对应水侵开始时间，此时动态储量代表单井控制地质储量；累产液地下体积-动用油水体积倍数图版末端也会出现水平段，水平段高度减1为水体体积倍数。③模型成功计算出了研究区最大动态储量为126.17×104 m3，最大动用水体为182倍地质储量，模型合理解释了断溶体油藏水侵过程压力变化的原因。

关键词: 断溶体, 水侵, 物质平衡, 动态储量, 水体体积, 一间房组, 奥陶系, 顺北一区, 塔里木盆地

Abstract:

The fault-karst reservoir of Shunbei-1 area in Tarim Basin exhibits a non-monotonic trend in formation pressure, initially decreasing and then rebounding as cumulative production increases. This phenomenon cannot be explained by traditional water influx models， but aligns more closely with progressive development behavior. Based on the concept of “sequential mobilization” and material balance theory, the water influx process is divided into pre-water influx and post-water influx, with evaluation models respectively established for dynamic reserves and aquifer volume. The results show that： （1） Ordovician reservoir in Shunbei Oilfield is a typical fault-karst reservoir, characterized by a stereoscopic model of narrow horizontal strips and large vertical spans. It is controlled by the NE-trending strike-slip fault system. The carbonate reservoir of Yijianfang Formation is a “fault-karst” type reservoir with poor physical properties, and fault-karst bodies are continuously distributed along major fault zones. （2） The newly established water influx evaluation model can be used to calculate dynamic reserves, water influx rate, and dynamic aquifer volume of fault-karst reservoirs in the research area, thereby determining single-well controlled geological reserves and aquifer size. The plot of cumulative liquid production (subsurface volume) versus dynamic reserves exhibits a plateau segment, with the plateau onset indicating the start of water influx. The dynamic reserves at this point represent the single-well controlled geological reserves. The plot of cumulative liquid production (subsurface volume) versus mobilized oil-water volume ratio also shows a plateau at its terminus. The plateau height minus 1 yields the aquifer volume ratio. （3） In the study area application, the model successfully calculated a maximum dynamic reserves of 126.17×104 m3 and a maximum mobilized aquifer volume of 182 times the geological reserves. The model provides a rational explanation for the pressure variations observed during water influx in fault-karst reservoirs.

Key words: fault-karst reservoir, water influx, material balance, dynamic reserves, aquifer volume, Yijianfang Formation, Ordovician, Shunbei-1 area, Tarim Basin

中图分类号: 

  • TE344

图1

塔里木盆地顺北油田区域位置(a)及奥陶系岩性地层综合柱状图(b)（据文献[1]修改）"

图2

顺北油田奥陶系断溶体油藏立体模型"

图3

顺北油田奥陶系简化的断溶体水侵示意图 注：N和Nu分别为单井控制地质储量和动态储量，104 m3；W、We和Wu分别为水体体积、累计水侵量和动用水体体积，104 m3。"

图4

顺北一区SHB1-9井奥陶系一间房组动态储量随累产液地下水体积的变化特征"

图5

顺北一区SHB1-9井奥陶系一间房组累产液地下水体积随折算体积系数的变化特征"

图6

顺北一区SHB1-9井奥陶系一间房组动用油水体积倍数随累产液地下体积变化特征"

图7

顺北一区SHB1-9井奥陶系一间房组水侵量、产液量及压力变化曲线"

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