Volume 18 Issue 2
Jun.  2012
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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.
Citation: 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.

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

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  • Received: 2012-01-12
  • Published: 2012-06-28
  • 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.

     

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