鄂尔多斯长7致密砂岩储层体积压裂可行性评价  

Feasibility evaluation of volume fracturing of Chang-7 tight sandstone reservoir in Ordos Basin

作　　者：石道涵[1] 张兵[2] 何举涛[3] 蒋廷学[1] 蒲春生[2] 

机构地区：[1]中国石化石油工程技术研究院,北京100728 [2]中国石油大学(华东)石油工程学院,山东青岛266555 [3]长庆油田采油二厂,甘肃庆阳745100

出　　处：《西安石油大学学报（自然科学版）》2014年第1期52-55,7,共4页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项"低渗透油藏大功率谐振波-化学复合驱技术研究"(编号:2011ZX05009-004);国家自然科学基金"低渗油藏低频振动辅助表面活性剂复合驱油机理研究"(编号:51274229);国家自然科学基金"延时式可控高能气体压裂技术动力学机理研究"(编号:51104173)

摘　　要：从储层岩石矿物组分、岩石脆性指数、天然裂缝发育状况以及体积压裂所需地应力条件4个方面分析了鄂尔多斯盆地长7致密砂岩储层实施体积压裂的可行性。结果表明：鄂尔多斯长7储层岩石石英质量分数为40．3％，脆性指数为35％～50％；储层微裂缝发育概率在60％左右，裂缝密度为3条／10m，天然裂缝及水平层理较发育；水平两向主应力差为4—5MPa，均可满足实现体积压裂复杂形态裂缝扩展的条件。体积压裂井试采效果表明，体积压裂后可形成一定程度复杂缝网。水平井体积压裂技术可成为该储层高效开发的重要措施。The feasibility of volume fracturing of Chang-7 tight sandstone reservoir in Ordos Basin is theoretically evaluated from four aspects of the rock mineral components,the rock brittleness index,the natural fracture development situation and the crustal stress conditions. The results show that the quartz content of the oil reservoir is 40. 3%,the rock brittleness index is 35% ~ 50%,; the crack development probability is about 60%,the crack density is 3 per 10 meters,natural cracks and horizontal beddings are developed well; the difference between two horizontal principal stresses is 4 ~ 5 MPa. These all meet the conditions for realizing volume fracturing. The test production of the fracturing wells in studied area shows that complex fracture network is formed in the Chang-7 oil reservoir to a certain degree. So the volume fracturing technology of horizontal wells will be important measures for the efficient development of the studied reservoir.

关 键 词：致密砂岩储层 体积压裂 可行性 岩石脆性指数 天然裂缝 地应力 

分 类 号：TE348[石油与天然气工程—油气田开发工程]