鄂尔多斯盆地定边油田长2低渗砂岩储层特征及评价  

Characteristics and assessment of the Chang 2 low permeability sandstone reservoir in the Dingbian oilfield of Ordos Basin

作　　者：白玉彬[1,2] 张乾[3] 

机构地区：[1]西安石油大学,陕西西安710065 [2]西北大学,陕西西安710069 [3]中石化江苏油田分公司,江苏扬州225009

出　　处：《特种油气藏》2011年第5期56-59,138,共4页Special Oil & Gas Reservoirs

基　　金：陕西省自然科学基础研究计划项目"酸性大环境中的碱性成岩作用研究--以靖安延长组为例"(2009JM5002);十一五国家科技支撑计划"低(超低)渗透油藏精细描述关键技术与剩余油分布预测模型研究"(2007BAB1701)联合资助

摘　　要：鄂尔多斯盆地定边油田长2储层为三角洲平原分流河道沉积的中—细粒长石砂岩,平均孔隙度为16.36%,平均渗透率为9.58×10-3μm2,属中孔、中—低渗储层。根据压汞曲线、铸体薄片等分析资料及试采、录井等测试结果,对长2储层特征进行研究和综合评价认为:长2储层孔隙类型主要有原生孔隙和次生孔隙,后者发育的长石溶孔对储层物性改善起到了积极作用;成岩作用类型主要为压实作用、胶结作用和溶蚀作用,前两者对储层物性破坏严重,而溶蚀作用扩大了储集空间,改善储层物性;长2储层可以划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4种类型;综合评价长2储层是以Ⅰ、Ⅱ2种类型为主要构成的中—低渗透储层,优质储层多分布在分流河道沉积旋回的中下部。The Chang 2 reservoir in the Dingbian oilfield of Ordos Basin contains medium-fine feldspathic sandstone in delta plain distributary channel deposit,with average porosity of 16.36% and average permeability of 9.58×10-3μm2,belonging to medium porosity and mid-low permeability reservoir.The Chang 2 reservoir has been studied and evaluated based on analytical data of intrusive mercury curve and casting thin section as well as the results of production test and mud logging.It is concluded that the Chang 2 reservoir involves primary porosity and secondary porosity,and the latter had developed feldspar dissolved pores which had improved reservoir property;the diagenesis mainly involves compaction,cementation and denudation,the first two were severely destructive to reservoir property,and denudation had enlarged reservoir space and improved reservoir property;the Chang 2 reservoir can be divided into Class I,II,III and IV these four types;the Chang 2 reservoir is a mid-low permeability reservoir mainly composed of Class I and II reservoir,with high quality reservoir distributed in the mid-low part of the distributary channel deposit.

关 键 词：鄂尔多斯盆地 定边油田 长2储层 储层特征 储层评价 

分 类 号：TE122.2[石油与天然气工程—油气勘探]