大尺度缝洞型碳酸盐岩油藏含水率变化规律
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摘要
大尺度缝洞型碳酸盐岩油藏储集空间组合形式多样、油水关系复杂,储层认识较为困难,且不同的缝洞组合模式具有不同的含水率变化特征;针对洞边裂缝组合模式和多洞多缝组合模式,以弹性理论为基础,通过计算分析油水界面变化与裂缝的关系,研究了对应油井的含水率变化规律。结果表明,2种缝洞组合模式的单井含水率曲线都呈台阶状变化,对于洞边裂缝组合模式,洞边与井沟通的裂缝条数直接影响油井含水率曲线台阶的个数;对于多洞多缝的组合模式,油水界面淹过溶洞个数直接影响油井含水率曲线台阶的个数。含水率曲线台阶的高度、长度及无水采油期的长短均与缝洞模式有关,针对矿场实际生产中的曲线进行了简单分析。结合地震及试井资料可综合判别地下缝洞组合模式及属性参数,对油田矿场认识储层具有一定的指导意义。
Large-scale fractured-cavernous reservoirs are complex due to the diversified storage space, oil-water relations, as well as the fracture and cave combination mode. Based on the fracture and cave combination mode and the multiple fracture and cave mode, as well as the elastic theory, the relationship between variation of water oil contact and fracture is analyzed and calculated so as to study the variation rule of water cut of corresponding well. The results show that: single well water content curves are shown in "step-like" form for the two fractured-cavernous mode: the caves around the cracks in the joints with high angle hole pattern, hole side combination mode will directly affect the number of "step" in the water content curve; and for the multiple hole and fracture combination model, the oil-water interface swamp caves will directly affect the number of "step" in the water content curves. The height, length and duration of no-water oil production are all related with the fracture model, and it can be inferred and analyzed from the field production curve. Therefore, seismic and well test data can be integrated to determine the combination fracture and cave combination as well as property parameters of the reservoir, and it is of certain significance for the understanding of carbonate reservoir.
Large-scale fractured-cavernous reservoirs are complex due to the diversified storage space, oil-water relations, as well as the fracture and cave combination mode. Based on the fracture and cave combination mode and the multiple fracture and cave mode, as well as the elastic theory, the relationship between variation of water oil contact and fracture is analyzed and calculated so as to study the variation rule of water cut of corresponding well. The results show that: single well water content curves are shown in "step-like" form for the two fractured-cavernous mode: the caves around the cracks in the joints with high angle hole pattern, hole side combination mode will directly affect the number of "step" in the water content curve; and for the multiple hole and fracture combination model, the oil-water interface swamp caves will directly affect the number of "step" in the water content curves. The height, length and duration of no-water oil production are all related with the fracture model, and it can be inferred and analyzed from the field production curve. Therefore, seismic and well test data can be integrated to determine the combination fracture and cave combination as well as property parameters of the reservoir, and it is of certain significance for the understanding of carbonate reservoir.
引文
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[3]李炼民,杜志敏,贾英.缝洞型碳酸盐岩潜山油藏研究现状及技术展望[J].油气地质与采收率,2004,11(1):12-15.
[4]张希明.新疆塔河油田下奥陶统碳酸盐岩缝洞型油气藏特征[J].石油勘探与开发,2001,28(5):17-21.
[5]任玉林,李江龙,黄孝特.塔河油田碳酸盐岩油藏开发技术政策研究[J].油气地质与采收率,2004,11(5):57-59.
[6]鲁新便.岩溶缝洞型碳酸盐岩储集层的非均质性[J].新疆石油地质,2003,24(4):360-362.
[7]张德志,王子胜,战艾婷.高速非达西渗流时三重介质油藏的压力响应[J].油气地质与采收率,2009,16(1):97-99.
[8]张抗.塔河油田性质和塔里木碳酸盐岩油气勘探方向[J].石油学报,2001,22(4):1-6.
[9]修乃岭,熊伟,高树生,等.缝洞型碳酸盐岩油藏水动力学模拟研究[J].特种油气藏,2007,14(5):49-51.
[10]吕爱民,姚军,郭自强.塔河油田奥陶系缝洞型底水油藏典型相渗关系及水驱曲线[J].油气地质与采收率,2010,17(2):101-104.
[11]孙玉平,修乃岭,熊伟,等.缝洞型碳酸盐岩油藏流动数学模型初探[J].石油钻探技术,2008,36(1):65-68.
[12]程倩,熊伟,高树生,等.基岩—孤立溶洞不稳定窜流方程[J].特种油气藏,2009,16(3):53-55.
[13]程倩,熊伟,高树生,等.单洞型油藏弹性开采实验研究[J].特种油气藏,2009,16(2):47-49.
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