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development characteristics and quantitative prediction of reservoir fractures in the Chaoyanggou oil field

Mining Science and Technology 2009年第3期19卷 373-379页

作者： ZHANG Zhen TONG Heng-mao BAO Zhi-dong Faculty of Natural Resource ＆ Information Technology China University of Petroleum Beijing 102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China

The Chaoyanggou oil field is a fractured low-permeability reservoir, where the distribution of oil and gas is controlled by the distribution and development of *** on outcrop, drilling core, thin section and log data, the development characteristics of fractures in this area are *** this basis, the degree of fracture development was predicted by quantitative analysis of fracture strength and numerical *** result shows that four groups of structural fractures, i.e., in near NS, and EW directions and in due NW and NE directions, were developed in the reservoir, with the nearly NS and EW fractures dominant, which are the along bedding decollement fractures formed by compressive folding action, while low angle shear fractures are related to *** fractures are mainly formed in the reversed tectonic stage at the end of the Mingshui formation during the Cretaceous *** degree of fracture development is controlled by such factors as lithology, stratum thickness, faults, folds and *** fractures are developed with a clear zonation and are best developed in the northern zone, moderately developed towards the south and poorly developed in the middle *** prediction results are in good agreement with interpretation results from logs.

关键词： fracture development characteristic fracture strength numerical simulation Chaoyanggou oil field

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A local rainfall-triggered giant landslide occurred in a region along a high-speed railway on the Qinghai‒Tibetan Plateau

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Journal of Mountain Science 2024年第9期21卷 2939-2955页

作者： LI Qingpeng LIU Wenhui HE Renjie YING Chunye LIU Hairui DOU Zengning LIU Yabing YANG Sha SONG Xianteng School of Geological Engineering Qinghai UniversityXining 810016China Key Lab of Cenozoic Resource and Environment in North Margin of the Tibetan Plateau Qinghai UniversityXining 810016China College of Eco-Environmental Engineering Qinghai UniversityXining 810016China Qinghai Transportation Planning and Design Institute Co Ltd Xining 810000China Xining Center for Integrated Natural Resources Survey China Geological SurveyXining 810000QinghaiChina

An increasing number of geological hazards along high-speed railways on the Qinghai‒Tibetan Plateau have occurred and have resulted in a profound influence on old infrastructure,which has attracted increasing *** landslide event that occurred on September 15,2022,in Jiujiawan village,Xining city,Qinghai Province,is a typical *** on field investigations and remote sensing interpretations,a comprehensive analysis was conducted on the ***,the potential secondary failure of the current Jiujiawan landslide was assessed using Fast Lagrangian Analysis of Continua in Three Dimensions(FLAC3D).Based on the application of the small baseline subset-interferometric synthetic aperture radar(SBAS-InSAR)technique to SAR images from February 24,2017 to September 14,2022,a significant westward horizontal deformation was found to have been formed prior to the occurrence of the *** maximum annual average deformation rate in the line of sight(LOS)direction reached-45 mm/yr,with a maximum cumulative deformation of-178 *** value was consistent with the continual increase in annual precipitation(2.51 mm/yr)prior to the occurrence of the *** accumulated precipitation before the landslide was 279.8 mm,accounting for 54.2%of the total annual precipitation,with a particularly notable surge in monthly precipitation observed during August(250.3 mm).Additionally,the occurrence of a seismic event with a magnitude of Ms 6.9 in Menyuan County,80 km away from Xining,could be a potential triggering factor to the landslide,as evidenced by an abrupt subsidence alteration observed prior to and following the *** maximum subsidence in the line of sight(LOS)direction exceeded 11 mm,exhibiting a highly consistent spatial distribution with the occurrence range of *** results suggest that the Jiujiawan landslide was likely induced by earthquake events in the early stage and heavy rainfall in the later *** FLAC3D numerical

关键词： Landslide development characteristic Driver Mudstone Xining Basin

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