Effective Amount of Gas Released from Water and Its Significance
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摘要: 在研究影响天然气在地层水中溶解能力各种因素的基础上,分析了造成水溶相天然气释放的地质条件。通过分析水溶释放气在运移途中损失,提出了有效水溶释放气量的概念,并建立了一套研究方法。将其应用于松辽盆地北部阿拉新和二站气田从齐家 -古龙凹陷嫩一段源岩获得的有效水溶气量研究中,结果表明水溶释放气是气藏形成不可忽视的重要组成部分。Abstract: Based on the study of factors influencing the dissolution ability of gas in formation water, this paper analyses the geological conditions for gas to release from water,and points out that the decrease of temperature and pressure, increase of mineralization degree are the main causes to bring out the release of gas from water. Based on this cognition and using the relation among the amount of gas dissolved in water,and temperature and pressure conditions,the paper establishes a calculation method to study the amount of gas released from water.By analysing the losing of gas released from water on the way of migration due to diffusion and adsorption,the paper has put forward the concept of effective amount of gas released from water ,and established a research method , finally applied it in Alaxin and Erzhan gas fields in the north part of Songliao Basin.Through study on the effective amount of gas released from water of the first member of Nenjiang Formation in Qijia-Gulong Sag, it can be seen that the amount is about 8.60×108m3, which is about 18.64% of geological reserves in two gas fields ,indicating that the gas released from water is the important part for gas to accumulate and form gas pool.
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