收稿日期: 2011-11-25
修回日期: 2012-08-10
网络出版日期: 2012-10-10
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
柴达木盆地涩北气田为第四系疏松砂岩储层气田，气田构造平缓，储层岩性疏松，气层含气饱和度较低，气水关系复杂。涩北气田的出水模式有边水水侵、泥质隔层内水的窜流、水层水窜流和储层束缚水转化为可动水等。其中，储层束缚水转化为可动水产出是一种新的出水形式。在气田开发过程中，天然气不断采出，地层压力逐步下降，储层在上覆地层压力作用下被压缩，孔隙度降低，地层含水饱和度增加，当储层压力下降到一定程度时，部分束缚水逐步变成可动水产出，从而影响气田生产。根据涩北气田储层地质特征，结合气田出水规律，分析了涩北气田气井出水原因及类型。从开发实验、数据分析入手，建立了储层束缚水变可动水产出预测图版，该图版中储层含水饱和度曲线与束缚水饱和度曲线交点对应的压力即为气藏层内可动水临界出水压力，研究表明随气藏压力下降，气层束缚水可转变为可动水产出。
许文平，吴朝东,关平,扈福堂 . 柴达木盆地第四系疏松砂岩天然气储层可动水预测方法研究[J]. 天然气地球科学, 2012 , 23(5) : 952 -955 . DOI: 10.11764/j.issn.1672-1926.2012.05.952
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.
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