柴达木盆地涩北二号生物气田微构造对气藏气水分布动态变化的控制

发布时间：2019-01-27 20:23

【摘要】：针对涩北二号气田开发后期边水水侵方向预测、井网调整等问题,综合考虑背斜构造边水气藏特征,提出以微构造研究为基础,结合实际生产数据,分析微构造对气藏气水分布动态变化的控制作用。结果表明:微构造图所界定气水边界更符合实际生产,负向微构造所在位置可动水饱和度明显偏高,水侵面积与可动水饱和度具有较高的相关性,位于负向微构造开发井平均单井日产水量为10.26m~3,位于正向微构造开发井平均单井日产水量为1.52m~3。研究认为:(1)气水边界线分布趋势与气藏微构造等值线分布趋势有较好的相关性,表明气藏气水分布特征明显受微构造分布特征控制;(2)气藏内水侵常常首先发生在气藏边缘小低点、小沟槽等负向微构造内;(3)负向微构造带内边水水体量较大,边水驱动力强,边水推进速度较快;(4)涩北二号气田气藏下步实现高效开发,降低水淹速度,其有效方法是有效地控制沟槽带内开发井的产气速度,并在微构造高点增加新井以完善井网。
[Abstract]:In view of the problems of water intrusion direction prediction and well pattern adjustment in the later stage of development of Shibei No. 2 gas field, considering comprehensively the characteristics of water gas reservoir in the edge of anticline structure, it is put forward that based on the study of microstructures and combined with actual production data, The control effect of microstructures on gas and water distribution in gas reservoirs is analyzed. The results show that the gas-water boundary defined by the microstructural map is more in line with the actual production, and the location of the negative microstructures is obviously higher than that of the movable water saturation, and the water invasion area has a high correlation with the movable water saturation. The average daily water production in a negative microstructural development well is 10.26 mm3, and that in a forward microstructural development well is 1.52 mm3. The results show that: (1) there is a good correlation between the distribution trend of gas-water boundary line and the distribution trend of microstructural contour of gas reservoir, which indicates that the gas-water distribution characteristics of gas reservoir are obviously controlled by micro-structural distribution characteristics; (2) the water invasion in gas reservoir usually occurs first in the low edge of the gas reservoir, the small trench and other negative microstructures, (3) the water body of the edge water in the negative microstructural belt is large, the driving force of the edge water is strong, and the speed of the edge water advancing is relatively fast. (4) the gas reservoir in Shibei No. 2 gas field can be developed efficiently and the flooding rate can be reduced. The effective method is to effectively control the gas production rate of the development well in the trench zone, and to add new wells to perfect the well pattern at the high point of the micro-structure.
【作者单位】：西南石油大学石油与天然气工程学院;长江大学;中国石油青海油田天然气开发公司;
【基金】：国家重大专项“低渗、特低渗透油气田经济开发关键技术”(编号:2011ZX05013)资助
【分类号】：TE37

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