| The effect of water injection was well in ZHENGZhuang Chang6Reservoir of Seven village oilfield since the development of waterflooding,, but part of wells water percentage were rising with the increase of water injection, preliminary judgment is water control system. Therefore, the study on characteristics of fracture cracks was great significance for development of oilfield.The characteristics of cracks fracture is studied, and the effect of the ZHENGZhuang Chang6reservoir is analysis by ten kinds of means of field and core observation, magnetic core-orientation test, microseismic surveillance, waterflood front monitoring, microfracture observation, electron scanning, energy spectrum analysis, waterflood test of real core model, rock stress parameters measurement, tracer monitoring and fracture pressure analysis.It was understanded that NE and EW was main direction of underground cracks fracture direction through multidisciplinary analysis of methods. With layers of nearly horizontal seam characteristics of fractures, oil-water nearly horizontal migration to crack effect is good and displacement effect is bad to promote the shape. While ZhengZhuang injection area artificial fracture cracks cracking direction by the natural crack control, north east direction and the direction of artificial joints made with vertical cracks. The nonequidistant line injection wells network along fracture direction was rational in fractural low permeability sandstone reservoir. |
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