应用“双水分析法”识别莺歌海盆地低阻气藏

Identifying Low-resistance gas reservoir with dual-water analysis in Yinggehai basin

郭书生 周涛

GUO Shu-sheng ZHOU Tao

中海石油中国有限公司湛江分公司, 广东湛江 524057 中海油油田服务股份有限公司, 广东湛江 524057

莺歌海地区的低阻气藏成因复杂,应用常规测井技术和解释方法很难有效识别,在解释过程中容易漏掉气层。通过分析该地区的沉积构造特征,结合理论研究,在弄清本地区低阻气藏的地质、物理成因的基础上,提出采用"双水分析法"进行低阻气层识别。在确定"双水"之一"束缚水饱和度"参数时,采用动态T2截至值法处理核磁共振,即在核磁共振响应的理论研究基础上,以本地区大量岩心样品试验数据为依据,获取适合本地区的关键核磁共振参数T2截至值,进而准确获得储层束缚水饱和度和可动孔隙度。结果显示,动态T2截至值法求得的束缚水饱和度与含水饱和度进行对比,可快速、有效地发现储层,识别气藏。通过实践,该方法对识别此类低阻油气层是完全适用的。

Low-resistance gas reservoir is hard to identify with conventional logging and analysis technique because of its complicated genesis,and often can be missed in the interpretation section.Dual-water analysis was proposed to identify low-resistance gas reservoir by analyzing its sedimentary structure and geologic and physical origins.Dynamic T2 cutoff value method was applied to handle nuclear magnetic resonance when treating bound water saturation.That is to get key nuclear magnetic resonance parameters suitable in place on the base of theoretical research and great quantities of core sample test data,and then to acquire bound water saturation and mobile gas saturation.Results show that by comparison of obtained bound water saturation and water saturation,it is easy to find formation and identify reservoir and effectively.Practice proved that this method is completely suitable for distinguishing low-resistance gas reservoirs.

10.3969/j.issn.1000-7393.2007.06.021