摘要
在南海某气区,CO2与烃类气体相伴相存,分布复杂,不仅给油气层的发现、评价带来干扰,也给开发造成不利的影响。为了避免钻遇高含CO2的构造或层位,准确地监测并研究其分布状态,探讨其显示特征及储藏规律,指导勘探开发方向,降低勘探开发成本,根据CO2的理化特性,通过对现场数据的统计分析CO2成因类型、分布的特征以及与烃类间的关系,发现CO2的显示规律为:CO2与全烃的比值达10%为CO2气层,小于7%为烃类气层,并指出无机成因CO2气层的CO2与烃类具有互为消长关系,有机成因则呈伴生关系,在富含N2非烃气层中,N2与CO2也存在互为消长关系。同时推荐了一种先进、实用、检测精度高的CO2录井仪器,提出了脱气器的选择条件,对影响现场CO2检测的因素进行了分析。这些方法在南海的某些区域应用已经取得实质性的效果。
In a gas field in South China Sea, CO_2 is coexisted with the hydrocarbon gases and complex in its distribution, which not only brings the disturbance to the discovery and evaluation of oil and gas reservoirs, but also causes the disadvantageous influence on the development. In order to avoid drilling with high CO_2 bearing structure or zones, accurately monitor and study their distributing state, discuss its displaying characteristics, guide the exploration and development, and reduce the exploration and development cost, the displaying rule was obtained according to CO_2 physical and chemical properties, by analyzing CO_2 genetic type, distributing characteristics and the relationship between hydrocarbons, which was that the ratio of CO_2 to total hydrocarbon reached 10% in the CO_2 zone, less than 7% in the hydrocarbon gas zone, CO_2 of the inorganic genetic gas zone had the growth and decline relationship with the hydrocarbons, while that of the organic genetic presented the associated relationship, N_2 and CO_2 also existed the growth and decline relationship between each other in the rich N_2 bearing non-hydrocarbon zones. The authors recommended an advanced, practical and high accuracy CO_2 mud logging instrument, put forward the selecting condition for the degasser, and analyzed the factors of influencing the well-site CO_2 detection. These methods got substantial effect in some areas of South China Sea.
出处
《录井工程》
2006年第2期8-12,共5页
Mud Logging Engineering
关键词
CO2
气层
监测
成因
分布特征
CO_2, gas zone, monitor, genesis, distribution characteristics
