摘要
临南洼陷带沙三段下亚段碎屑岩储层非常发育,而低渗透、特低渗透储层所占比例较高,难动用储量大。在研究储层微观特征及低渗透成因的基础上,将研究区沙三段下亚段低渗透——特低渗透碎屑岩储层划分为4大类10小类,并分析了各类储层的微观主控因素和增产改造方法。A类储层仅需对钻井液污染带进行针对性的酸洗处理即可具备较好的自然产能,将其命名为自然产能控低渗透储层;B类储层可以利用酸液溶蚀碳酸盐胶结物、增大孔隙度和渗透率,从而获得较好产能,将其命名为酸化控低渗透——特低渗透储层;C类储层根据填隙物类型分为粗晶——连晶碳酸盐胶结类型、泥质胶结类型、塑性组分充填类型和次生石英胶结类型4小类,不同类型采取不同酸化和压裂措施能取得一定的效果,将其命名为酸压控低渗透——特低渗透储层;D类储层压裂和酸化效果均较差,将其命名为力求产特低渗透储层。
Clastic reservoirs are highly developed in lower Sha3 reservoir of Lin'nan depression, with low-permeability and extralow permeability reservoir that is high in amount and difficult to explore. Based on studies about the key elements of sandstone acidization, the oil reservoir is divided into four categories corresponding to ten types by analyzing petrology microeconomic and causes factors of reservoir in study area. Production stimulation treatments are proposed according to the study on primary microeconomic factors. Category A reservoir has good natural capacity by treating the acidized damage zone, and this Category is named low natural production low permeability reservoir. Using acid can dissolute carbonate cementation in Category B reservoir, it increases the porosity and permeability, and then obtains good capacity, therefore, the Category B is named acidization controlled low and extralow permeability oil reservoir. According to interstitial content type,the Category C reservoir is classified into mid-crystal carbonate cement type, argillaceous cement type, plastic components filling type and secondary quartz cement type. Different types should be treated by different acidization fracturing measures. It is named acidization and fracturing controlled low and extra-low permeability oil reservoir. Capacity of Category D is very low by fracturing and (or) acidization, and it is named difficult to use of extra-low permeability reservoir. This series of new classification not only can apply to evaluation of the quality and potential of the low-permeability reservoir, but also can improve the producing rate and recovery of the low-permeability reservoir.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第5期6-9,111,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化科研攻关项目"临南洼陷沙河街组碎屑岩低渗储层成因与评价"(P10012)
关键词
成岩作用
赋存状态低
渗透成因
敏感性矿物
酸化临南洼陷
diagenesis
occurrence status
low permeability genesis
sensitivity mineral
acidization
Lin'nan depression
