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Mirco fault has strong concealment in seismic data interpretation, the fault which is not easy to identify tend to complicate the oil-water relationship in oil-bearing blocks. Combined with the feature of seismic profile reflection to determine the relative change trend of reservoir top interface depth by using logging data, the identification of mirco fault can be achieved effectively. It has a great help for interpretation the oil-water relationship reasonably, looking for advantageous location by using this method to identify mirco fault in W21 block in X oilfield. Keywords-mirco fault; well-log data; seismic profile; oil-water relationship. I. INTRODUCTION In seismic data interpretation, well-log data is often used to make synthetic seismogram and horizon calibration tracking work, but it has little application in fault interpretation. It's hard to identify mirco faults with strong concealment by using conventional geophysical methods. Various fine seismic description technology has been used to identify the mirco faults, such as ant tracking technology, seismic coherence techniques

The Application of Well-log Data in Mirco Fault Identification