海相碎屑岩储层微观非均质性特征及其对高含水期剩余油分布的影响  

Microscopic heterogeneity characteristics of marine clastic reservoirs and effect to remaining oil distribution in high water cut stage

作　　者：孙廷彬[1] 林承焰[1] 崔仕提[2] 张曙振[2] 王平[2] 王玲 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266555 [2]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [3]中石化中原油田博士后工作站,河南濮阳457001

出　　处：《中南大学学报（自然科学版）》2013年第8期3282-3292,共11页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05009-003);中国石油天然气股份有限公司重大科技专项资助项目(2010E-2111);中央高校基本科研业务费专项(11CX06005A)

摘　　要：利用岩心精细描述、铸体薄片图像分析和X线衍射黏土矿物分析等手段,对TLM盆地A油藏石炭系下部海相碎屑岩储层的微观非均质性进行研究,并通过真实岩心水驱油实验研究微观非均质性对剩余油分布的影响。研究认为:基于孔隙与喉道类型、孔喉组合类型和微观结构类型3个层次内容,研究区储层的微观非均质性可划分为Ⅰ型、Ⅱ型和Ⅲ型3种类型。其中,Ⅰ型非均质具有均质粗粒结构,发育次生溶蚀型和原生孔隙型2种孔喉组合。在驱油过程中,非均质内绕流现象明显,剩余油呈斑块状富集;Ⅱ型非均质具有钙质斑块粗粒结构,发育次生溶蚀型和次生钙质斑块型孔喉组合。驱油过程中,受钙质斑块遮挡作用影响,非均质内剩余油呈斑块状富集;Ⅲ型非均质发育均质细粒结构和原生孔隙型孔喉组合,驱油效果差,剩余油呈连片状分布。3种非均质类型中,Ⅰ型非均质剩余油所占比例最大,Ⅱ型次之,Ⅲ型最小。在纵向上,油层非均质自下而上具有Ⅲ型—Ⅱ型—Ⅰ型的演化特点。在平面上,从研究区的西北部到东南部,Ⅰ型非均质剩余油所占比例逐渐增加,Ⅱ型和Ⅲ型非均质剩余油所占比例逐渐减少。Using core fine description, cast thin section image analysis and X-ray diffraction of clay minerals and other means, the microscopic heterogeneity of marine clastic reservoir of lower Carboniferous reservoir in TLM basin was studied, and through the real core water flooding experiment the influence of micro-heterogeneity on the remaining oil distribution was analyzed. The study suggests that, depending on the type of pore throat, the pore throat portfolio type and microstructure type, microscopic heterogeneity of the reservoir can be divided into three types of type I, type II and III. Type I heterogeneous has homogeneous coarse-grained structure, and has the development of two pore throat combination tvoes of secondary dissolution twe and Drimarv porosity tvne. In the Flooding process, the nhenomenon of flow around is obvious, and it has a patchy remaining oil enrichment in this heterogeneous type. Type II heterogeneity has calcium plaque coarse structure, and develops two pore throat combination types of secondary dissolution type and secondary calcium plaque-type. In the process of oil displacement, by effect of calcium plaque shelter, the remaining oil within heterogeneity was patchy enrichment. Type III heterogeneous develops homogeneous fine-grained structure and primary porosity pore throat combination, and the remaining oil was even patchy distribution. Among the three heterogeneous types, type I heterogeneous has the largest residual oil ratio, type II followed, typeIII being minimum. Vertically, there is a evolution of type III to type II to type I bottom-up, and the thickness is successively larger from type lII to type I. On the plane, the proportion of remaining oil of type I heterogeneity is gradually increased from the northwest to the southeast of the study area, and it is the opposite for type II and type III heterogeneous.

关 键 词：海相碎屑岩储层 微观非均质性 孔喉组合 微观结构 剩余油分布 

分 类 号：TE343[石油与天然气工程—油气田开发工程]