基于压裂监测的致密储层甜点识别

Sweet spot recognition of tight reservoir based on fracture monitoring

李新发 李婷 刘博峰 张峰 肖志明 王浩帆

中国石油玉门油田分公司钻采工程研究院，甘肃 酒泉 735000

Research Institute of Drilling and Production Engineering, Yumen Oilfield Company, PetroChina, Jiuquan 735000, China

甜点分布是影响致密储层产能的关键因素，为了准确识别致密储层甜点区的位置和规模，通过在地面部署一定数量三分量检波器，使用微地震向量扫描监测技术，采集压裂期间微地震事件，经过向量扫描成像获取不同时刻的破裂能量分布，进行叠加后得到监测区的甜点分布图。在鄂尔多斯盆地东部1口压裂水平井部署了33个检波器，采用微地震向量扫描技术，解释出3 km×3 km范围内甜点区分布位置和规模，与5口实钻井的气层钻遇情况以及测试情况均符合。同样，对另外3个井组的微地震监测结果与实际钻遇情况对比，综合符合率达到90%以上。这表明应用地面微地震向量扫描监测方法能够有效地识别出致密储层的甜点分布，指导后期井位部署，且该技术施工方便、成本低，具有推广价值。

Sweet spot recognition is the key factor that affects the productivity of tight reservoir. In order to accurately identify the location and scale of sweet spot area of tight reservoir, numbers of three-component geophones are deployed on the ground during fracturing to collect the micro seismic events by microseismic vector scanning monitoring. The fracturing energy distribution at different times is obtained by vector scanning imaging, and sweet spot distribution in monitoring area is obtained after stacking. 33 geophones were deployed for a fractured horizontal well in the east of Ordos Basin, the distribution and scale of sweet spot area within 3 km×3 km were interpreted by this technology, which was in accordance with the drilling and testing conditions of five drilled wells.  The same way was used in other three well groups, and the coincidence rate with actual drilling was more than 90%. This shows that the method of ground microseismic vector scanning can effectively identify the sweet spot distribution of tight reservoir and guide the well location deployment, and it is convenient in construction, low in cost, and has popularization value.

10.6056/dkyqt202005011