Reservoir structure at Yufutsu gas field, JAPAN determined by analysis of induced microseismic multiplets
Reservoir structure at Yufutsu gas field, JAPAN determined by analysis of induced microseismic multiplets
复制标题
通过诱发微震多次波分析确定日本由布津气田储层结构
DOI：
10.1190/1.2370332
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
R. Kamitsuji
中科院分区：
文献类型：
--
作者：
Y. Kumano;H. Asanuma;H. Niitsuma;K. Tezuka;R. Kamitsuji
在日本石油勘探有限公司（JAPEX）管理的北海道Yufutsu气田，我们研究了水力压裂引起的微地震活动，以描绘储层中的裂缝系统。由4个深层井下和3个浅层地震传感器组成的网络检测到3700多个地震事件。其中701个事件显示出明显的P波和S波，并被定位。常规定位方法确定的油源分布过于分散，无法揭示详细的储层结构。因此，我们通过使用波形相似性聚类事件来重新检查数据集，随后使用相对到达时间重新定位。基于波形相干性，576个事件（82%的定位事件）被识别为多重事件。我们使用双微分（DD）技术重新定位了多胞胎，并获得了一个描绘由多胞胎组成的数十个亚平行条纹的源分布。用我们的站点分布对DD定位技术进行的综合测试表明，这些条纹是由共面网络布置引起的伪影。
Summary We examine induced microseismicity from a hydraulic stimulation at the Yufutsu gas field on Hokkaido Island, Japan, managed by Japan Petroleum Exploration Co., Ltd. (JAPEX), to delineate the fracture system in the reservoir. Over 3,700 seismic events were detected by a network of 4 deep downhole and 3 shallower seismic sensors. 701 of these events showed clear onsets of P and S waves and were located. The source distribution determined using conventional location methods was too diffuse to reveal detailed reservoir structure. We therefore re-examined the dataset by clustering the events using waveform similarity, and subsequently relocated using relative arrival times. 576 events (82% of located events) were identified as multiplet events based on waveform coherence. We relocated the multiplets using a double differential (DD) technique, and obtained a source distribution that delineates tens of sub-parallel streaks composed of multiplets. A synthetic test of the DD location technique with our station distribution suggests that the streaks are artifacts arising from the co-planar network arrangement.