DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE

ZHOU Hanguo; GUO Jianchun; LI Jing; PENG Chengle; WANG Chang; GAO Shuai; ZHENG Jinkai

doi:10.12090/j.issn.1006-6616.2018.24.01.004

Volume 24 Issue 1

Feb. 2018

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Article Navigation > Journal of Geomechanics > 2018 > 24(1): 35-41

ZHOU Hanguo, GUO Jianchun, LI Jing, et al., 2018. DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE. Journal of Geomechanics, 24 (1): 35-41. DOI: 10.12090/j.issn.1006-6616.2018.24.01.004

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DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE

doi: 10.12090/j.issn.1006-6616.2018.24.01.004

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China
2.
Manage Center of Oil and Gas Exploration of SINOPEC Shengli Oilfield Company, Dongying 257000, Shandong, China
3.
Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
4.
Hebei Kangbao Guangheng New Energy Co., Ltd., Zhangjiakou 075000, Hebei, China

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Received: 2017-06-12
Revised: 2017-11-15
Published: 2018-02-01

Abstract

Abstract

The Ordovician carbonate oil pool in northern Renqiu of the Jizhong depression is taken as an example in this article. The rock mechanical parameters in the study area were calculated based on the log data of the oil field, and the typical isolated water long elliptic karst cave of the target reservoir was selected, with its surrounding rock stress and its damage zone calculated by numerical simulation and third strength theory. The results show that:1) Under the combined action of overburden pressure and lateral pressure, the stress concentration effect zone of the long elliptic karst cave surrounding rock is 9 times of the radius. 2) The surrounding rock stress of long elliptic karst cave is mainly compressive stress, mainly concentrating in the top and the bottom. 3) The filling property of karst cave has great influence on the principal stress difference and damage range of surrounding rock. For the long-elliptic karst cave, the principal stress difference and shear damage of the surrounding rock increase with the increase of filling pressure when the filling pressure is less than 0.1 MPa; while the principal stress difference and the shear damage range of the surrounding rock gradually decrease with the increase of filling pressure when the filling pressure is more than 0.1 MPa.
- carbonate rocks,
- karst cave,
- surrounding rock stress,
- numerical simulation

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DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE

doi: 10.12090/j.issn.1006-6616.2018.24.01.004

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DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE

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