Prediction of Free Water in the Unconsolidated Sandstone Reservoir in the Quaternary Gas Field,Qaidam Basin
Received date: 2011-11-25
Revised date: 2012-08-10
Online published: 2012-10-10
Sebei gas field in the Qaidam basin is a Quaternary unconsolidated sandstone gas field with gentle field structure,loose reservoir lithology,low gas saturation and complex gas/water relationship.The effluent mode of Sebei gas field includes edge water invasion,water channeling in the muddy compartment,water channeling in the water layer and transfer of reservoir bound water into free water.Among them,the reservoir bound water into free water is a new mode.During the development of gas field,with the continuous gas recovery,formation pressure decreases gradually.Hence,reservoirs become compressed under the overlying strata leading to the decrease of porosity and increase of formation water saturation.When the reservoir pressure drops to a certain extent,part of the bound water gradually was converted into free water,affecting the gas production.Based on the geological characteristics of reservoirs,combined with effluent rules,the effluent origin and types were analyzed for the Sebei gas field.Based on the development experiments and analytical data,a prediction chart of reservoir bound water into free water was obtained.The chart has different intersection point for the reservoir water saturation curves and bound water saturation curves.The intersection point pressure is the critical effluent pressure for the bound water in the gas reservoirs.Studies have shown that with the decrease of gas reservoir pressure,it is possible for gas reservoir bound water converting into free water.
XU Wen-ping,WU Chao-dong,GUAN Ping,HU Fu-tang . Prediction of Free Water in the Unconsolidated Sandstone Reservoir in the Quaternary Gas Field,Qaidam Basin[J]. Natural Gas Geoscience, 2012 , 23(5) : 952 -955 . DOI: 10.11764/j.issn.1672-1926.2012.05.952
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