苏北盆地金湖凹陷西部斜坡带发育1套储油能力较好的湖相碳酸盐岩储层,受不均匀溶蚀作用的影响,其平面非均质性强,局部地区孔隙度较大,但连通性差,储层渗透率低.湖相碳酸盐岩油藏油井的生产特征与砂岩油藏油井的生产特征完全不同,表现为自然产能低,实施酸化措施后产量提高幅度大；不同位置的油井产油量差异大；投产初期含水率高；油井产油量递减存在常规递减和突变递减2种形式.通过对研究区试油试采和生产动态资料的分析,在深入研究产能影响因素的基础上,确定储层总有效厚度和单井储层有效渗流半径是影响湖相碳酸盐岩油藏油井产油量的2个主要因素,进而明确研究区投产储层的筛选条件.根据湖相碳酸盐岩油藏的特征,提出了多次酸化、压裂、侧钻井、水平井和多分支水平井等开发技术对策.%In western slope of Jinhu depression in Subei Basin, there is a set of lacustrine carbonate rocks that its oil storage ability is quite good. Because of the influence of nonuniform dissolution, the reservoir's plane heterogeneity is serious. Local area has much big-ger pores, but the pores' connectivity is poor. So, the permeability of the reservoir is low. Oil wells show completely different produc-tion characteristics from those wells which in sandstone reservoirs. In lacustrine carbonate reservoir, the wells' natural capacity is low and their productions have a large extent of improving after being acidified; the productions of wells in different locations are quite dif-ferent; the water cut is very high in initial production stage; and there are two forms of production decline: conventional decline and mu-tational decline. Based on the analysis of testing, production test information and production performance data, and further studying on the influence factors of production capacity, we summarize that the reservoir total effective thickness and reservoir effective seepage ra-dius of single well are two major factors for oil wells yielding, and further determine the screening conditions of reservoir which will put into production. According to lacustrine carbonate reservoir characteristics, the development technical measures of acidification, frac-turing, sidetracking well, horizontal well and multi-lateral horizontal well are accordingly proposed.
展开▼
