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  

The effect of mini-structure on the dynamic variation of gas and water distribution in Sebei Ⅱ Gasfield,Qaidam Basin,China

作　　者：奎明清[1] 胡望水[2] 李瑜 沈润凯[2] 曹继华 

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]长江大学,湖北武汉430100 [3]中国石油青海油田天然气开发公司,青海格尔木816000

出　　处：《天然气地球科学》2017年第5期696-702,共7页Natural Gas Geoscience

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

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。The aim of this paper is to critically investigatethe problem of prediction of the direction of edge water invasion and the adjustment of well pattern in the late stage of the development of Sebei II Gasfield, by considering the characteristics of anticline gas reservoir with edge water.This research is based on the feature of mini-structure and the actual production data to analyze the controlling effect of mini-structure on the dynamic change of gas and water distribution in gas reservoir. Results showed that a gas-water boundary defined by the micro structure mapis more consistent with the actual production,whereby movable water saturation was significantly higher in the negative mini-structure.There is a high positive correlation between water invasion area and mobile water saturation.The average daily water production ofsingle well is 10.26 cubic meters in the negative mini-structure,and is 1.52 cubic meters in the positive mini-structure.It could be concluded that： （1）There is a good correlation between the distribution of the gas-water boundary and the distribution of the mini-structure of the gas reservoir, which indicates that the distribution of gas and water in the gas reservoir is obviously controlled by the distribution of the mini-structure. （2）The water invasion within the gas reservoir firstly occurs in the negative mini-structures such as small low and small grooves in the anticline. （3）In the negative mini-structure, the volume of edge-water is larger,the edge-water driving force is stronger,and edge-water carriesforward at a faster rate. （4）The method of effective development and reducing flooding velocity of gas reservoirs in the Sebei-2 Gasfield is to effectively control the gas production rate of the development wells on the negative mini-structures, and add new wells on the positive mini-structures to improve the well network.

关 键 词：微构造 气水边界 气藏开发 气水分布动态变化 涩北二号气田 

分 类 号：TE122.1[石油与天然气工程—油气勘探]