CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA

TANG Yong; MEI Lian-fu; CHEN You-zhi; TANG Wen-jun; XIAO An-cheng

Volume 18 Issue 2

Jun. 2012

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Article Navigation > Journal of Geomechanics > 2012 > 18(2): 120-139

TANG Yong, MEI Lian-fu, CHEN You-zhi, et al., 2012. CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA. Journal of Geomechanics, 18 (2): 120-139.

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CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA

1.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
Key Laboratory of Tectonics and Petroleum Resources Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Cainan Operation District of Xinjiang Oilfield Company, CNPC, Fukang 831511, China

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Abstract

Abstract

Structural stress field is one of the main reasons on fracture formation. It is the key of prediction structural fracture that paleostructure stress field is microscopically quantitative calculated.So we can well understand the fracture distribution in underground strata based on careful analysis to geological structure and numerical model coincides with the practice about the region of interest.It was influenced due to squeezing process from the SE direction during Late Crataceous and compressed from the NE direction in the period of Late Eocene-Early Oligocene in the Xuanhan-Daxian area of the northeast of Sichuan, China. The structural fracture development in Feixianguan formation in Lower Triassic series was effected by the two periods of structural action in Xuanhan-Daxian region. The fracture is an important geologic factor affecting the development of the oilfield. Through analysis of interaction in rock layers, calculation results on conjugate joints and mechanical twinning and using three dimensional finite element analysis method, we have obtained paleostructure stress in Feixianguan Formation of Xuanhan-Daxian region. We well know the distribution feature of paleostructure stress on the two periods. By threshold value-limited of the carbonatite burst, fracture area in Puguang and Maobawe blocks was predicted prediction. The integrated fracture rates give the basis to evaluate fracture strength. It provides the scientific geological basis for increasing the rate of drilling fractures and reducing the risk and cost of exploration and development.
- structural stress fields,
- three dimensional finite element,
- Feixianguang Formation,
- structural fracture,
- Xuanhan-Daxian region

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