碳酸盐岩凝析油气藏超低含水饱和度及其对开发动态的影响  

INFLUENCE OF ULTRA-LOW WATER SATURATION ON CONDENSATE CARBONATITE RESERVOIR DEVELEPMENT

作　　者：彭珏[1] 康毅力[1] 李前贵[1] 吴林刚 夏玉民 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]中油国际阿克纠宾油气股份公司

出　　处：《钻采工艺》2007年第1期31-34,145,共4页Drilling & Production Technology

基　　金：油气藏地质及开发工程国家重点实验室基金项目(PLN9720);四川省青年科技基金项目(02ZQ026-042)。

摘　　要：油气藏含水饱和度认识直接影响油气藏储量评价及开发决策。哈萨克斯坦M碳酸盐岩凝析油气藏密闭取心含水饱和度为1．6％～19．9％，平均为6．1％，通过室内建立束缚水饱和度实验得到平均含水饱和度为27．7％-42．5％。这说明该油气藏初始含水饱和度低于束缚水饱和度，即存在超低含水饱和度现象。文章对形成超低含水饱和度的可能原因，即油气藏沉积史、温度、润湿性、距离自由水接触面的高度以及孔隙大小的分布进行了分析，厚的砂泥岩层和膏盐层的封隔作用使油气藏超低含水饱和度最终得以保存。开发生产中所呈现的见水便停喷、停产或间开等问题是超低含水饱和度油气藏的特殊动态行为。在钻井完井及开发过程中防止水相圈闭损害，提高水驱效率具有重要意义。Recognizing the reservoirs water saturation directly affects reserves evaluation and development plan of the reservoirs. The water saturation varies from 1.6% to 19.9% by sealed coring in M carbonate condensate reservoir of Kazakhstan, and the average value is 6.1%. The average water saturation is 27.7%-42.5% in the irreducible water saturation experiments. All of which show the initial water saturation is lower than the irreducible water saturation, that is, there exists ultra-low water saturation in the carbonate reservoir. This article discussed the reasons of forming ultra-low water saturation, that is the sedimentary history, temperature, wettability, the height to the free water contact surface and the distribution of pore size, which may be contributed to the development of the ultra-low water saturation. The isolating effects of thick sand shale and gypsum layers are main issues for conserving ultra-low water saturation. During production, some arising problems, such as the no natural flow and no production or intermittent production are the special dynamic behaviors of reservoirs with ultra-low water saturation. These researches have great significance for preventing aqueous phase trapping damages and improving waterflood efficiency in the course of drilling, completion and development.

关 键 词：哈萨克斯坦 碳酸盐岩 凝析油气藏 超低含水饱和度 水相圈闭 

分 类 号：TE344[石油与天然气工程—油气田开发工程]