【作者】 李皋；

【导师】 赵敬松； 唐洪明；

【作者基本信息】 西南石油学院 ， 矿物学、岩石学、矿床学， 2002， 硕士

【摘要】 随着天然气工业的纵深发展，勘探开发浅层气已逐渐成为增储上产的重要领域之一。川西地区浅层气资源丰富、埋藏浅，勘探开发具有广阔前景。白马-松华地区蓬莱镇组气藏属于浅层低渗砂岩气藏，该气藏独特的工程地质特征决定了其损害机理不同于常规油气藏，在国内具有代表性和典型性。本论文以此为契机，通过多学科、多手段综合研究，系统探讨了蓬莱镇气藏损害机理及特征，提出了相应的保护建议，并可为其它同类浅层低渗砂岩气藏的储层保护提供参考。 论文采用现代岩矿分析测试技术深入系统地分析蓬莱镇组气藏的工程地质特征，认识到储层粘土矿物和孔隙结构特征导致区内储层损害复杂性和独特性的关键，为储层保护提供了技术思路和战略重点。针对气层低渗近致密的特点，进行了敏感性、水锁损害及钻完井液损害评价等实验评价程序。综合分析指出蓬莱镇组气藏主要损害机理为水锁损害，同时储层潜伏着较强的碱敏、水敏和应力敏感性损害。钻完井过程中主要表现为工作液滤液水锁和固相侵入损害。论文最后提出了相应的气层保护措施与建议。更多还原

【Abstract】 As the deep advancing of natural gas industry, development of shallow gas reservoirs has become more and more significant to enhance natural gas production. Shallow gas reservoirs in western Sichuan basin are shallowly buried and abundant in resource and its exploitation has a bright prospect. Penglaizhen sandstone gas reservoir in Baima-songhua area is of shallow low-permeability. The unique gee-engineering characteristics make its damage mechanisms differ from conventional oil/gas reservoirs and be of significance in pilot and demonstration in China. Out of this point, through comprehensive studies of multi-subjects and varied methods, the damage mechanisms and characteristics of Penglaizhen formation are systematically discussed and relevant protection advice is provided in this paper. The study results can also be taken as reference to other similar shallow low-permeability sandstone gas reservoirs.Data from thorough and systematic modern core analysis reveal the engineering and geologic characteristics of Penglaizhen formation. It is noted that the characteristics of clay minerals and pore-throat structures lead to complex and unique formation damages. Thus, protection route and strategic emphasis are presented. Aimed at low permeability and near tight gas reservoir, new experimental evaluations of sensitivities, water blocking damages and damages caused by drilling and completing fluids have been carried out. Comprehensive analyses show that water-blocking induces the most serious damage to Penglaizhen formation. At the same time, alkali sensitivity, water sensitivity and stress sensitivity are relative serious. While solid phases invasion and aqueous trap are the dominant damage types during well drilling and completion. Finally, corresponding protection measures and advice are presented in this paper.更多还原