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Recognition and Prediction of Tight Reservoir Fracture in the Chang 8 Section in Zhenjing Area

ZHANG Shimao,DING Xiaoqi,YI Chao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China)  
Chang 8 section tight reservoir is characterized by significant heterogeneity and extensive fractures development,so,it is difficulty in the petroleum exploration and water-injection in Zhenjing area Yanchang formation,Ordos Basin.By observing the core photo of extension group of Zhen-jing area,the conventional logging data and the FMI logs,analyzed are the characters of single wells and planar distribution,the results of which show that the Chang 8 section is characterized by low porosity and low permeability,and each well has on average 3 ~ 6 fractures which are mostly high-angle or vertical fractures.The fracture growth grade is related with radial resistivity change value,extent resistivity difference,sandstone thickness and sandstone tight grade.According to logging data and single well fracture identification,forecasted is fractures planar distribution in Chang 8 section with sand body distribution and sedimentary faces distribution.The above method laid a foundation for oil and gas exploration and development in this area.
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