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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 the western slope belt of Jinhu Sag, North Jiangsu Basin, a set of lacustrine carbonate reservoirs with better oil storage ability are developed. Due to the effect of uneven dissolution, the plane heterogeneity is strong and the porosity in some areas is relatively large. However, connectivity is poor and reservoir permeability is low. Production characteristics of oil and gas wells in lacustrine carbonate reservoirs are completely different from those of oil and gas wells in sandstone reservoirs, showing low natural productivity and large increase in output after acidizing measures; oil production in oil wells at different positions is quite different; initial production High moisture content; oil wells decline in the existence of conventional decrement and mutation decreases in two forms. Based on the analysis of trial oil production and production dynamic data in the study area and on the basis of further research on the influencing factors of production capacity, it is determined that the total effective thickness of reservoir and the effective seepage radius of single well reservoir are the major influencing factors The two major factors of oil production are analyzed so as to clarify the screening conditions for the production reservoir in the study area. According to the characteristics of lacustrine carbonate reservoirs, a number of development strategies such as acidizing, fracturing, lateral drilling, horizontal wells and multi-lateral horizontal wells are proposed.