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Characteristics and Distribution of Tectonic Fractures in Chang 6~1 Low-Permeable Reservoir in Wuqi Area in Ordos Basin

ZHOU Xin-gui,ZHANG Lin-yan,FAN KunInstitute of Geomechanics,CAGS,Beijing 100081,China  
The chang 61 low permeable reservoir in Yanchang Formation in the Upper Triassic is the main oil layer in Wuqi area.According to outcrop,drilling core observations,thin-section analysis,and the paleomagnetic orientation method of the drilling cores,the authors have done a detail description and statistics of the tectonic fractures qualitatively and quantitaively.The authors find that the well-deve-loped fractures are NE and NW directions which are regional conjugated high-angle tectonic fracture system.The density of tectonic fractures is 0.4-1.9 unit per meter,the most of tectonic fractures are tensional and mostly filled(about 57%).The invalid tectonic fractures are in dominant(about 68%).Based on finite element simulation method,together with rock burst method and strain energy method,the predicted math model of tectonic fracture is established.The authors quantitatively predict and eva-luate the distribution and development degree of tectonic fractures according to the model.The fracture development,sub-development and un-development areas have been separated,and tensile-shear fracture directions are predicted.These results supply important geological references for the further petroleum exploration in Wuqi area.
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