鄂尔多斯盆地吴起地区延长组长6_1低阻油层成因分析及识别方法  

Genesis analysis and identification methods of Chang6_1 low resistivity oil pays in Yanchang Formation in Wuqi area,Ordos Basin

作　　者：王维斌[1,2] 郭杜凯 陈旭峰[4] 任瑞清[1,2] 赵静 王维博 

机构地区：[1]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [3]中国石油长庆油田分公司气田开发处,陕西西安710018 [4]中国石油长庆油田分公司第二采油厂,甘肃庆阳745100 [5]中国石油长庆油田分公司西安长庆化工集团有限公司,陕西西安710018 [6]中国石油长庆油田分公司第七采油厂,陕西西安710018

出　　处：《油气地质与采收率》2017年第2期38-45,89,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"鄂尔多斯盆地致密油资源潜力;甜点预测与关键技术应用"(2016ZX05046-005)

摘　　要：鄂尔多斯盆地吴起地区延长组长61低阻油层分布面积广、储量规模大,但其成因尚不明确,传统的识别方法易把低阻油层遗漏或误判。为此,从油田生产实际出发,根据钻井、录井、测井、分析化验、试油、试采及储层特征等资料,以鄂尔多斯盆地吴起地区主力生产层长61低阻油层为研究对象,利用灰色关联法分析其成因及识别方法。结果表明:长61低阻油层形成的主要原因是孔隙结构差;其次是绿泥石和铁方解石等胶结物含量高、地层水矿化度高和岩石粒度细等。在此基础上,建立交会图版法、测井曲线叠合法、核磁共振测井法、特殊录井法及多井横向综合对比法等多种针对低阻油层的识别方法,在生产应用中取得良好效果。Chang61low resistivity oil pays are widely distributed in Triassic Yanchang Formation in Wuqi area of Ordos Basin with large reserves. However,they are often missed or misjudged using traditional identification methods due to uncertainties in their genesis. Based on actual oilfield production practice,data from well drilling,logging,well logging,experiment analysis,well testing and producing test were analyzed for genesis analysis and identification of Chang61 low resistivity oil pays using grey correlation method. The results show that the poor pore structure is the main factor of the formation of Chang61 low resistivity oil pays,and the secondary factors are high content of chlorite and ferrocalcite cements,high formation water salinity and the fine-grained rock. Meanwhile,the cross plot method,logging curve superimposition method,NMR logging method,special logging method and multi-well correlation method were developed for low resistivity oil pays identification. These methods were put into use and good effects were obtained during oilfield production.

关 键 词：孔隙结构 低阻油层 主控因素 识别方法 吴起地区 鄂尔多斯盆地 

分 类 号：TE112.23[石油与天然气工程—油气勘探]