断裂导水对哈南油田注采的影响及开发对策
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摘要
通过哈南油田岩芯裂缝古地磁定向 ,确定了裂缝发育方向。鉴定了 12 1块微裂缝薄片 ,分析了微裂缝与大裂缝关系。作了一个井组的示踪剂实验 ,检测裂缝与断层导水形式。在此基础上 ,分析了前人的地震、钻井断层解释 ,以及动态资料 ,认为哈南油田阿尔善油藏断裂系统是NE向断层 (包括裂缝 )与NW向裂缝组成的一组共轭断裂系统。发现断裂系统导水严重 ,断裂发育区水进速度约为 40～ 10 0m/d。断层面导水、断层对接导水致使注采层系混乱 ,形成上层注下层采或下层注上层采的非同层注采局面。同时部分油井憋压过高 ,部分油井暴性水淹。针对油田断裂系统特征 ,提出了应对措施 :导水断层附近注水井井距加大 ;在断层面充水情况下 ,断层附近注水井适当减少注入量或采用脉冲式注水 ;针对层系之间串水现象 ,调整开发层系。
The directions of fractures in Hanan Olifield are determined by paleomagnetic method.121 micro-fracture slices are identified to analyze the relationship between micro-and macro-fractures.The tracer experiment of a well group is done to detect the water transmission fractures and faults.Based on the data of seism,drilling interpetation in faults and the performance data,a conclusion is drawn that in the fault system of Aershan Reservoir,NE strike faults and NW strike fractures are conjugated.The transmissibility of the fault system is so serious that the inflow rate in fault-developed areas is 40-100 m/d.The effects of tansmissibility resulted in the confusion of the injection-production layers,thus forming injection-production in different layers.On the same time,some production wells are of high pressure and flooded.According to the characteristics of the fault system,corresponding contermeasure is put forward.
The directions of fractures in Hanan Olifield are determined by paleomagnetic method.121 micro-fracture slices are identified to analyze the relationship between micro-and macro-fractures.The tracer experiment of a well group is done to detect the water transmission fractures and faults.Based on the data of seism,drilling interpetation in faults and the performance data,a conclusion is drawn that in the fault system of Aershan Reservoir,NE strike faults and NW strike fractures are conjugated.The transmissibility of the fault system is so serious that the inflow rate in fault-developed areas is 40-100 m/d.The effects of tansmissibility resulted in the confusion of the injection-production layers,thus forming injection-production in different layers.On the same time,some production wells are of high pressure and flooded.According to the characteristics of the fault system,corresponding contermeasure is put forward.
引文
1 李道品 低渗透砂岩油藏开发 [M] 北京 :石油工业出版社 ,1997 1～ 10
2 纳尔逊HA 天然裂缝性储层的地质分析 [M] 柳广第 ,朱筱敏 ,译 北京 :石油工业出版社 ,1985 14 2～ 15 7
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5 LaubachSE .Amethodtodetectnaturalfracturesstrikeinsandstones[J] .AAPGBull,1997,81(4) :6 0 4～ 6 2 3
6 王平 有天然裂缝的砂岩油藏的开发 [J] 石油勘探与开发 ,1993 ,14 (4) :6 9～ 74
7 岳乐平 ,邸世祥 ,李道品 ,等 油气田钻井岩芯裂缝方位确定的古地磁原理与方法 [J] 地球物理学进展 ,1997,12 (3) :71～ 76
8 周文 裂缝性油气储集层评价方法 [M] 成都 :四川科学技术出版社 ,1998 2 75～ 2 80
2 纳尔逊HA 天然裂缝性储层的地质分析 [M] 柳广第 ,朱筱敏 ,译 北京 :石油工业出版社 ,1985 14 2～ 15 7
3 张莉 ,岳乐平 鄯善油田储层裂缝特征及形成时期 [J] 西北大学学报 ,1999,2 9(2 ) :15 3～ 15 5
4 岳乐平 ,张莉 ,吴诗平 鄯善油田裂缝特征及构造应力 [J] 地质力学学报 ,1999,5 (2 ) :5 9～ 6 4
5 LaubachSE .Amethodtodetectnaturalfracturesstrikeinsandstones[J] .AAPGBull,1997,81(4) :6 0 4～ 6 2 3
6 王平 有天然裂缝的砂岩油藏的开发 [J] 石油勘探与开发 ,1993 ,14 (4) :6 9～ 74
7 岳乐平 ,邸世祥 ,李道品 ,等 油气田钻井岩芯裂缝方位确定的古地磁原理与方法 [J] 地球物理学进展 ,1997,12 (3) :71～ 76
8 周文 裂缝性油气储集层评价方法 [M] 成都 :四川科学技术出版社 ,1998 2 75～ 2 80
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