摘要
微地震监测作为实时评估人工作用激发裂缝时空特征的关键技术,在压裂效果评判中起着重要作用.由于地质非均质性和水力压裂应力干扰,地层中裂缝破裂呈现出较为复杂的形态和破裂模式,研究这些破裂引起的地质特征及影响,对水力压裂效果评估和后期开采开发具有重要意义.本文基于微地震地面多方位观测,利用震源定位-震源机制联合反演方法,提高了微地震震源定位和震源机制反演的精度.基于高精度的震源定位结果,结合裂缝破裂尺度,破裂时空位置、震源机制等多参数达到对多尺度裂缝破裂特征描述的目的.通过对泸州区域某页岩气井水力压裂效果综合评估的应用,该井裂缝扩展呈现出以天然裂缝为主导的复杂缝网模式,而产能数据定性印证了不同破裂尺度和破裂模式对压裂效果和产能均产生不同的影响.
Microseismic monitoring as a key technology to describe the spatiotemporal characteristics of stimulated fractures,plays an important role in the evaluation of fracturing effects.Due to the geological heterogeneity of the reservoir and the stress interference during hydraulic fracturing,the fractures express complex geometries and rupture patterns,and it is meaningful to the evaluation of hydraulic fracturing effect and future gas exploitation and development.Based on a geological hydraulic fracturing project in Luzhou shale block of Sichuan Basin,this paper studies the rupture characteristics of hydraulic fracturing of multi-scale fractures with the advanced location result by source location and focal mechanism joint inversion method and attains to characterize the rupture patterns by combining the rupture scale related to the amplitude and dominant frequency of seismic wave,the spatiotemporal and focal mechanism of ruptures calculated from surface microseismic monitoring.The ruptures in this paper express the multi-scale fracture characteristics dominated by fault damage fracture zones and develop to be a complex fracture system,and they reflected in the differences in the spatial distribution of fractures,rupture patterns and scales,and the gas production data also proves that the different roles played by different scaled fractures during the hydraulic fracturing evaluation and future production.
作者
文山师
尹陈
石学文
张洞君
韩福盛
熊财富
WEN ShanShi;YIN Chen;SHI XueWen;ZHANG DongJun;HAN FuSheng;XIONG CaiFu(Shale Gas Development Research Institute of PetroChina Southwest Oil and Gas Field Company,Chengdu 610095,China;Tianfu Institute of Research and Innovation,Southwest University of Science and Technology(SWUST-TIRI),Chengdu 610299,China;School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;Key Laboratory of Solid Waste Treatment and Recycling of the Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《地球物理学进展》
CSCD
北大核心
2023年第5期2172-2181,共10页
Progress in Geophysics
基金
“微地震资料精细处理解释与深度挖掘”(XNS页岩院JS2022-47)
西南科技大学博士基金“基于地震波动力学特征的震源破裂尺度定量反演技术研究”(19zx7169)联合资助。
关键词
破裂尺度
微地震监测
震源机制
人工裂缝
断层破碎带
Rupture scale
Microseismic monitoring
Focal mechanism
Artificial fractures
Fault damage zones
