基于微地震裂缝参数反演的解释与应用研究

发布时间：2019-06-26 18:47

【摘要】：微地震监测技术是水力压裂中监测裂缝发育情况的有效地震方法,但在实际应用中仍存在诸多问题。为此,开展了地面微地震震源机制反演及裂缝解释技术在四川盆地页岩气藏勘探中的应用研究。根据地面观测的微地震数据,采用矩张量反演获得微地震事件的震源机制;基于震源机制结果计算微地震事件震级以及裂缝的地质参数;在统计的裂缝地质参数上解释裂缝发育情况,为油藏描述提供有效的信息。四川盆地页岩气实际资料的应用结果表明,研究区水平井的压裂设计合理,发育裂缝为高角度缝;根据统计的裂缝方位角度和实际的地下应力状况,建立了走滑型剪切裂缝模型;在裂缝模型上了解局部最大、最小水平应力方向,建议井布置方位在现有方位上调整为北偏西约10°。
[Abstract]:Microseismic monitoring technology is an effective seismic method to monitor fracture development in hydraulic fracturing, but there are still many problems in practical application. Therefore, the application of surface microseismic focal mechanism inversion and fracture interpretation technology in shale gas reservoir exploration in Sichuan Basin is studied. According to the microseismic data observed on the ground, the focal mechanism of microseismic events is obtained by moment tensor inversion, the magnitude of microseismic events and the geological parameters of fractures are calculated based on the results of focal mechanism, and the fracture development is explained on the statistical geological parameters of fractures, which provides effective information for reservoir description. The application results of shale gas data in Sichuan Basin show that the fracturing design of horizontal wells in the study area is reasonable and the fractures are high angle fractures. According to the statistical fracture azimuth angle and the actual underground stress condition, the strike-slip shear fracture model is established, and the local maximum and minimum horizontal stress directions are understood on the fracture model, and it is suggested that the well layout azimuth should be adjusted to about 10 掳north-west.
【作者单位】：中国石油化工股份有限公司石油物探技术研究院;中国石油化工股份有限公司重庆涪陵页岩气勘探开发有限公司;
【基金】：国家科技重大专项(2011ZX05035-003)资助~~
【分类号】：P631.4

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