Liuzhuang structure is a very complex fault-blocks.Its
characteristic is multi-fault , multi-fault block , mini in fault
block area and multi-styles of oil and gas reservoir which is
complex in relationship of oil ,gas and water.Limit-Test is
an effective method to make clear and grasp these
complicated geologic characters. In this article , by the
analysis of the Limit-Test information of Liu 6 well ,water
and oil contact of hydrocarbon reservoir ,control reserves of a
singal well were made clear .This research provides an
effective decision-making gist to make a correct decision for
oil and gas exploration and development .