岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 6675.doi: 10.12108/yxyqc.20230306
白杨1,2, 张晓磊3, 刚文哲1,2, 张忠义3, 杨尚儒4, 庞锦莲3, 曹晶晶1,2, 侯云超3
BAI Yang1,2, ZHANG Xiaolei3, GANG Wenzhe1,2, ZHANG Zhongyi3, YANG Shangru4, PANG Jinlian3, CAO Jingjing1,2, HOU Yunchao3
摘要: 通过岩心物性分析、恒压压汞和核磁共振测试,结合油源、构造等资料,对鄂尔多斯盆地平凉北地区上三叠统长8段储层低含油饱和度油藏的特征及成因进行了分析。研究结果表明:①平凉北地区上三叠统长8段储层含油饱和度普遍低于20%,而含水饱和度则普遍高于50%,属于典型的低含油饱和度油藏,且单井产量低,油水分异差,油藏呈零星状分布在长8段储层顶部。②供烃量不足是研究区油藏含油饱和度低的根本原因。M53井区为异地成藏,供烃距离较远导致供烃量不足;Y80井区为原地成藏,原地烃源岩排烃量小导致油气充注不足。③M53井区受低幅度构造影响,油气垂向和侧向运移动力不足。全区储层物性非均质性强,微细孔喉较为发育,束缚水占比大,可动水占比小,导致油气驱替可动水后其饱和度较低,从而使研究区油藏分布较分散、含油饱和度较低。④M53井区上新庄地区西南部构造高部位物性较好的储层为下一步增储上产的重要目标。
中图分类号:
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