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《Natural Gas Industry》 2014-01
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The formation mechanism of Upper Paleozoic tight sand gas reservoirs with ultra-low water saturation in Eastern Ordos Basin

Yao Jingli;Wang Huaichang;Pei Ge;Yuan Xiaoming;Zhang Hui;Exploration and Development Research Institute of Changqing Oilfield Company,PetroChina;State Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields;Exploration Department of Changqing Oilfield Company,PetroChina;  
Ultra-low water saturation occurs in the tight sand gas reservoirs of the 8th member of the Shihezi Fm and the Taiyuan Fm of the Upper Paleozoic in the eastern Ordos Basin.The study of its forming mechanism is of great significance to the selection of rational technical measures of reservoir protection and stimulation and to the improvement of single well production.The gas-water relative permeability measurement,NMR and thermometry of fluid inclusions were performed on sealed coring samples to analyze the characteristics of water saturation and hydrocarbon accumulation features of tight sandstone reservoirs.The irreducible water saturation measured with techniques of gas-water relative permeability and NMR is higher than the initial water saturation obtained from the sealed coring sample measurement,indicating that ultra-low water saturation is common in the tight sand gas reservoirs in the 8th member of Shihezi and Taiyuan Fms.Along with the increasing of temperature and pressure during the formation of gas reservoirs and the input of dry gas during the over-mature stage of source rocks,the water-carrying capacity of natural gas gets enhanced progressively.The irreducible water evaporates continuously and gets out of the reservoirs along with large-scale gas migration and gas leakage at later stages,resulting in the formation of ultra-low water saturation gas reservoirs.Considering that permanent water locks are easy to form due to water absorption in ultra-low water saturation gas reservoirs,rational measures can be taken to prevent and remedy water-lock damage,so as to improve the gas phase permeability of reservoirs and single well production.
【Fund】: 国家科技重大专项(编号:2011ZX05007-004)
【CateGory Index】: P618.13
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