Study On The Character Of Fracture Dewelopment And The Mechanism Of Fracture Formation Of Upper Triassic In Jiyuan-yuancheng Area Of Ordos Basin

Jiyuan - yuanchen researching area is located in the central - Northwest Ordos Basin, and its structure across the location of the Ordos Basin in northern Shaanxi Tianhuan Depression slopes and the two tectonic units, which entered the north of 38°zone. The location of the particular structure is a wide range of Structural convergence of location, the more complex tectonic framework. Upper Triassic in Ordos Basin is a major oil and gas reservoirs, and has the characteristics of low porosity and low permeability, fractured reservoir is important for its space. At the same time, the development of cracks in the basin of the oil and gas development has important implications, this article on Jiyuan - Metadata area the Upper Triassic of the fracture system was studied for the area and the Basin oil and gas exploration and development and infrastructure to provide the theoretical basis information.In this paper, modern structural geology theory as the guiding ideology, to follow "Overall, dynamic and comprehensive" study of the principles of Jiyuan - yuanchen researching area and adjacent areas of Upper Triassic cracks Detailed geological field observations, measurements, through core drilling cracks Detailed observations, measurements, through the study area have geophysical information, especially for the study area and imaging Diplog existing logging data processing and interpretation, combined with regional and local tectonic evolution and distribution of characteristics to create Jiyuan -yuanchen researching area Upper Triassic development of cracks in the system characteristics and spatial distribution patterns; combination on the basis of the distribution of tectonic fracture system characteristics, the nature, scale and intensity of deformation, the formation of cracks in different periods The characteristics of tectonic stress field of study; structural layer to extend the group structure in different stages of the identification of structural cracks in the system and its superposition with the focus on the transformation, through the structural analysis of the Triassic Yanchang group layer structure and the structure of Himalayan superposition of the fracture system were studied. Reservoir fracture system at the same time the mechanism of the formation of cracks and development of a preliminary analysis of controlling factors.