金湖凹陷L油田阜二段储层高含水微观分析  

Micro-factors Analysis on Paleocene Ef_2 Reservoirs in L Oilfield of Jinhu Sag of Subei Basin at High Water-cut Stage

作　　者：章雄冬[1] 包德宪[1] 郭庆安[2] 曹海虹[1] 田荣斌[1] 马慧杰[1] 

机构地区：[1]中国石油化工股份有限公司华东分公司石油勘探开发研究院,江苏扬州225007 [2]中国石油化工股份有限公司华东分公司开发处,江苏南京210011

出　　处：《石油天然气学报》2011年第7期123-128,1,共6页Journal of Oil and Gas Technology

摘　　要：为有效分析苏北盆地金湖凹陷L油田古新统阜宁组二段砂岩储层含水率较高的原因,开展了储层微观孔隙结构及真实砂岩微观模型水驱油的试验及研究工作。孔隙结构特征研究表明,储层以小孔细喉型为主,运用聚类分析对毛细管压力曲线进行分类评价后认为,孔隙结构较差;微观水驱油试验表明,驱油效率与渗透率间的关系不明显,与微观非均质性呈负相关;另外还受到水敏伤害、注水位置及加压方式等多方面因素的影响。综合分析认为:储层孔隙结构较差,且没有及时进行储层保护,压裂加剧了该区的非均质性,同时又没有注意到注采强度的控制,是造成该区含水率上升较快、采收率较低的主要原因。In order to effectively analyze the reasons of high water cut in Paleocene Ef2 sandstone reservoirs of L Oilfield in Jinhu Sag of Subei Basin,experiments and researches were conducted on micro-pore structural characteristics and water-drive experiment with natural sandstone micro-model.The research of pore structural features indicated that reservoirs were mainly of small pore with fine throat,clustering evaluation was used for analyzing and classifying the capillary pressure curves,it indicated that the pore structure was poorer.The research of micro-water drive experiment indicated that relationship between oil displacement efficiency and permeability was not obvious and it was in negative correlation with micro-heterogeneity,in addition,it was impacted by other factors,such as water-sensitivity,water-injection location and the style of water-injection pressure.A comprehensive analysis shows that the other major influencing factors for water-cut increase and low oil recovery persent include that reservoir pore structure is poor without timely formation protection,which speeds up the heterogeneity in the area,and the intension of steam flooding is not controlled,it's very difficult for waterflooding in the reservoir with poor pore structure and without protecting in time,the micro-heterogeneity was strengthened seriously by fracturing,and the strength of waterflooding were controlled,these are important reasons of high water cut and low recovery efficiency.

关 键 词：驱油效率 孔隙结构 含水率 阜宁组二段 金湖凹陷 苏北盆地 

分 类 号：P618.13[天文地球—矿床学]