2种方法优选确定易县紫荆关最大水平主应力量值

doi:10.13722/j.cnki.jrme.2018.0630

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Abstract

The compliance of a drilling-rod hydraulic fracturing test system has severe impacts on the calculation precision of the maximum horizontal principal stresses. How to improve the accuracy of deep hole hydraulic fracturing test has always been a hot topic and tough task in this field. In order to determine the in-situ stress state in a borehole of ZJGTEST-ZK 10 of 600 m deep，close to the Zijingguan fault in the Yi County，Hebei Province，Brazilian disk tests，hollow cylinder hydro-fracturing test，and concentric annular core tension test were conducted so as to determine the tensile strength of rock cores，and the tensile strength of granite cores ranges from 6.42 MPa to 9.35 MPa. The average tensile strength determined by the in-situ hydraulic fracturing test was 8.01 MPa，which was consistent with those determined by the above three laboratory tests. Based on the ten successful in-situ hydraulic fracturing tests and three laboratory tests，final determined maximum horizontal principal stresses range from 17.70 MPa to 35.38 MPa，the measured minimum horizontal principal stresses range from 10.36 MPa to 19.38 MPa，and the estimated vertical principal stresses range from 5.82 MPa to 15.49 MPa，the orientation of the maximum horizontal principal stress is NE，and ranges from NE40° to NE56°. The stress state is stable，and favorable for thrust faulting. By comparing the maximum horizontal principal stress magnitudes based on different tensile strengths and reopening pressures，the maximum horizontal principal stresses based on tensile strengths are markedly greater than those based on reopening pressures due to the negative impacts from the test system compliance when the test interval is deeper than 440 m. For the deeper test intervals，the maximum horizontal principal stresses based on tensile strengths indicate true in-situ stress state.

Key words： rock mechanics hydraulic fracturing test in deep boreholes maximum horizontal principal stresses Brazilian disc test hollow cylinder hydro-fracturing test concentric annular core tension test

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	Articles by authors
	JIA Jin1
	WANG Chenghu1
	GAO Guiyun1
	WANG Chunquan2
	ZHOU Hao1
	WEI Xueyong1
	WANG Pu1

Cite this article:

JIA Jin1,WANG Chenghu1,GAO Guiyun1, et al. Utilizing two methods to determine the horizontal principal stresses of Zijingguan region，Yixian County，Hebei Province[J]. , 2018, 37(S2): 4142-4150.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0630 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4142

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