Fractures of carbonate reservoirs are complex in Tazhong area and are critical to the poroperm characteristics of the reservoirs

hydrocarbon migration and accumulation

and productivity of wells.Taking into consideration the characteristics of fractures in the Ordovician carbonates in the Tazhong area

this paper presents three fracture prediction technologies

including coherence processing

strain analysis

and numerical simulation. High coherence facies indicates dense formation and low coherence facies may mean the existence of karst cavities or fractures

while extreme low coherence facies reflects faults of different grades.Strain analysis predicts the density of fractures caused by multi-phase tectonic movements

through drilling calibration and taking into consideration the parameters such as strata thickness

lithology

and fracture orientation.Constrained by strain magnitude

curvature

and other seismic attributes

the numerical simulation determines plane distribution and development of fractures through probabilistic simulation.According to the cutting relationship

filling components and filling orders of fractures observed in core samples

this paper predicted the fractured zones in the Ordovician carbonate reservoirs in Tazhong 16 -Tazhong 30 wellbloek by combining logging data

fracture prediction results of the foregoing three technologies

and analysis of regional tectonic stress field.The prediction results are consistent with the statistics of fracture parameters of the cores taken from the Ordovician carbonate reservoirs in the field

showing that these technologies are practical and effective in predicting fractured zones in carbonates.