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Determination of physical property limits for the gas accumulation in tight sandstone reservoirs in the eastern Ordos Basin
Author(s): 
Pages: 1040-1048
Year: Issue:  6
Journal: Acta Petrolei Sinica

Keyword:  tight sandstone reservoirpetrophysical limitthickness of irreducible water filmgas column heightOrdos Basin;
Abstract: 为了研究鄂尔多斯盆地东部上古生界致密砂岩储层天然气充注成藏的物性界限,分析微观孔喉内天然气的受力状态,综合考虑了束缚水膜、浮力、毛细管阻力、异常超压和水动力等参数对天然气充注成藏所起的作用.将束缚水膜厚度作为天然气可充注进入致密储层的最小孔喉半径,核磁共振测试获得了岩心束缚水饱和度并据此计算了束缚水膜的厚度,综合分析得出孔喉半径下限为10 nm.利用浮力和毛细管阻力的平衡状态计算得出的临界孔喉半径作为最大孔喉半径,通过先确定主要含气层段在不同地质时期的气柱高度,据此计算得到的临界孔喉半径作为孔喉半径上限.通过常规压汞测试结果建立了孔喉中值半径与物性参数的拟合趋势,再将孔喉半径上、下限带入拟合趋势中推算得出相应的物性界限参数.物性界限推算结果为:下石盒子组八段成藏物性孔、渗参数下限分别为4%和0 1mD,早白垩世末期储层孔、渗参数上限分别为13%和1.8mD,现今储层孔、渗参数上限分别为14%和2.0mD;山西组二段三亚段成藏孔、渗参数下限分别为2%和0.01 mD,早白垩世末期储层孔、渗参数上限分别为8%和1.0mD,现今储层孔、渗参数上限分别为9%和1.4mD;太原组成藏孔、渗参数下限分别为3.5%和0.02 mD,早白垩世末期储层孔、渗参数上限分别为11%和1.1mD,现今储层孔、渗参数上限分别为12%和2.0 mD.
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