Fracture imaging of the surface based microseismic monitoring in shale gas fracking: Methods and application

被引：7

作者：

Yang R. ^{[1
]}

Li D. ^{[1
]}

Pang H. ^{[2
]}

Ma T. ^{[1
]}

Cheng J. ^{[1
]}

Meng L. ^{[1
]}

机构：

[1] College of Geosciences and Surveying Engineering, China University of Mining & Technology, Beijing

[2] Sinopec Petroleum Exploration and Production Research Institute, Beijing

来源：

Natural Gas Industry | 2017年 / 37卷 / 05期

关键词：

Ant-tracking Cube; Fracturing barrier; Hydraulic fracture; Induced fracture; Micro-seismic; Monitoring; Seismic emission tomography (SET); Shale gas; Thinning algorithm;

D O I：

10.3787/j.issn.1000-0976.2017.05.004

中图分类号：

学科分类号：

摘要：

Micro-seismic monitoring is a critical supporting technology in hydraulic fracturing of shale gas reservoirs. In China, however, the current technique is incapable of directly imaging the fracture network generated in shale gas reservoirs stimulated hydraulically. In this paper, an inversion method for artificially induced fractures, i.e., thinning seismic emission tomography (TSET), was proposed, which integrates surface micro-seismic tomography with thinning algorithm. This method adopts the skeleton extraction algorithm and can realize the inversion of position and geometry of hydraulic fractures through extracting the skeleton structure at the position with the strongest energy. It was used in micro-seismic monitoring during the hydraulic fracturing of Well MY1 in the Zhongmou shale gas block in Henan. Firstly, energy stacking was obtained after the original micro-seismic data filtering and the seismic emission tomography (SET) processing with the Semblance algorithm. Secondly, energy diagram was interpolated through Kriging gridding into continuous images, and singular value decomposition (SVD) was conducted on the gridding results to reduce noise. Thirdly, the skeleton structure of the stacked energy diagram was extracted using the thinning algorithm to image hydraulic fractures or fracture zones that can be displayed visually. It is concluded that the stress state of natural fractures may be changed by hydraulic fracturing. Specifically, natural fractures are activated and fractures are induced at positions far away from the well sections in operation in order to generate new induced fractures at positions beyond the reach of fracturing fluids. Moreover, if hydraulic fractures run parallel or nearly parallel with natural fractures, the latter may guide the former to extend further; otherwise, the latter may function as a barrier to the former. © 2017, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：31 / 37

页数：6

共 22 条

[1] Wang S., Li R., Wang S., Basic characteristics and sequential process of shale gas exploration and development, Natural Gas Industry, 35, 6, pp. 124-130, (2015)
[2] Wang H., Li M., Shang X., Current developments on micro-seismic data processing, Journal of Natural Gas Science and Engineering, 32, pp. 521-537, (2016)
[3] Gharti H.N., Oye V., Roth M., Kuhn D., Automated microearthquake location using envelope stacking and robust global optimization, Geophysics, 75, 4, pp. MA27-MA46, (2010)
[4] Eisner L., Hulsey B.J., Duncan P., Jurick D., Werner H., Keller W., Comparison of surface and borehole locations of induced seismicity, Geophysical Prospecting, 58, 5, pp. 809-820, (2010)
[5] Robein E., Cerda F., Drapeau D., Maurel L., Gaucher E., Auger E., Multi-network microseismic monitoring of fracturing jobs-Neuquen TGR application, 71st EAGE Conference and Exhibition Incorporating SPE EUROPEC 2009
[6] Eisner L., Grechka V., Sherilyn W.S., Future of microseismic analysis: Integration of monitoring and reservoir simulation, AAPG Annual Convention and Exhibition
[7] Kiselevitch V.L., Nikolaev A.V., Troitskiy P.A., Shubik B.M., Emission tomography: Main ideas, results, and prospects, 61st Annual International Meeting
[8] Wang W., Zhou Y., Chun L., Characteristics of source localization by seismic emission tomgraphy for surface based on microseismic monitoring, Journal of China University of Petroleum (Edition of Natural Science), 36, 5, pp. 45-50, (2012)
[9] Liu Y., Liao R., Zhang Y., Gao D., Zhang H., Li T., Et al., Application of surface-downhole combined microseismic monitoring technology in the Fuling shale gas field and its enlightenment, Natural Gas Industry, 36, 10, pp. 56-62, (2016)
[10] Yang R., Zhao Z., Peng W., Gu Y., Wang Z., Zhuang X., Integrated application of 3D seismic and microseismic data in the development of tight gas reservoirs, Applied Geophysics, 10, 2, pp. 157-169, (2013)

← 1 2 3 →