用微地震波法确定松辽盆地头台油田地应力场特征
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摘要
在压裂过程中,利用地层岩石破裂产生的微地震波对松辽盆地头台油田10口水力压裂井的人工裂缝及天然裂缝方位、几何形态进行测试,确定了该油田地应力特征。分析结果表明,头台油田人工裂缝形成水平最大主应力方向为100°~120,°平均为110°;天然裂缝方向70%为0°~50,°地层中三向应力为南部较小、北部较大,构造断裂与天然裂缝的走向近似平行。
In the process of fracturing,fracture azimuths and geometries of artificial and natural fractures of 10 hydraulic fractured wells of Toutai Oil Field in Songliao basin are tested by microseismic wave from formation rock bursts,to confirm its characteristics of ground stress field.It is indicated from analysis results that,the maximum azimuth of horizontal principal stress of artificial fractures of Toutai Oil Field is 100°~120°,average 110°;70% of natural fracture azimuths range from 0°~50°.Triaxial stress of formation is lower in the south and higher in the north and the strike of structural faults parallels with natural fractures.
In the process of fracturing,fracture azimuths and geometries of artificial and natural fractures of 10 hydraulic fractured wells of Toutai Oil Field in Songliao basin are tested by microseismic wave from formation rock bursts,to confirm its characteristics of ground stress field.It is indicated from analysis results that,the maximum azimuth of horizontal principal stress of artificial fractures of Toutai Oil Field is 100°~120°,average 110°;70% of natural fracture azimuths range from 0°~50°.Triaxial stress of formation is lower in the south and higher in the north and the strike of structural faults parallels with natural fractures.
引文
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[2]刘广第,朱筱敏(译).天然裂缝性储集层地质分析[M].北京:石油工业出版社,1991.
[3]刘允芳.水压致裂法三维地应力测量[J].岩石力学与工程学报,1991,10(3):246-256.
[4]肖树芳.岩体力学[M].北京:地质出版社,1987.
[5]丁健民(译).地应力测量与研究[M].北京;地震出版社,1982.
[6]陈波.储层构造裂缝数值模拟技术的应用实例[J].石油学报,1998,(4):32-38.
[7]梅廉夫,徐思煌.裂缝油气藏综合分析系统[J].石油学报,1995,16(1):38-43.
[8]孙贻铃,王秀娟.朝阳沟油田构造裂缝及其有效性研究[J].大庆石油地质与开发,2005,24(1):33-34.
[9]李生,李霞,曾志林,等.低渗透油藏垂直裂缝井产能评价[J].大庆石油地质与开发,2005,24(1):54-60.