岩性油气藏 ›› 2023, Vol. 35 ›› Issue (6): 6371.doi: 10.12108/yxyqc.20230608
罗贝维1, 尹继全1, 胡广成2, 陈华1, 康敬程1, 肖萌1, 朱秋影1, 段海岗1
LUO Beiwei1, YIN Jiquan1, HU Guangcheng2, CHEN Hua1, KANG Jingcheng1, XIAO Meng1, ZHU Qiuying1, DUAN Haigang1
摘要: 利用岩心及薄片分析、核磁共振、微米CT测试、层序格架下的等时追踪及古地貌恢复等方法,对阿联酋西部地区白垩系森诺曼阶高孔渗灰岩的沉积特征、层序及沉积演化特征和成岩作用进行了系统剖析,从构造-沉积-成岩多维度对高孔渗储层的控制因素进行了研究。研究结果表明:①阿联酋西部地区森诺曼阶高孔渗灰岩储层主要分布于Mishrif组,岩性主要为亮晶厚壳蛤灰岩、亮晶生屑灰岩和泥晶生屑灰岩,储集空间主要为体腔孔、铸模孔和粒间溶孔;Mishrif组整体为碳酸盐岩缓坡沉积,可识别出内缓坡、中缓坡和外缓坡3类沉积亚相,厚壳蛤礁、高能滩、滩前、滩后、滩间及潟湖等6个微相;高孔渗储层主要发育于厚壳蛤礁微相和高能滩微相,其中,厚壳蛤礁微相优质储层孔隙度为20%~34%,渗透率为150~2 000 m D,高能滩微相优质储层孔隙度为25%~33%,渗透率为40~370 mD。②研究区Mishrif组自下而上可分为3个三级层序SQ1—SQ3,可细分为7个体系域,SQ1—SQ2层序主要由高位体系域构成,厚壳蛤礁微相和高能滩微相规模较大;SQ3层序由高位体系域和海侵体系域构成,古地貌高部位发育高能滩微相且物性更好。③研究区Mishrif组高孔渗储层的孔隙发育受多期成岩作用叠合改造,包括以同生期大气淡水溶蚀为主的建设性成岩作用和与烃类充注相关的保持性成岩作用。④研究区Mishrif组高孔渗储层受沉积相、层序格架、古地貌格局以及成岩改造作用等多重因素控制;储层物性具有明显的相控特征,而沉积微相的分布与演化在Mishrif组沉积早—中期(SQ1—SQ2)受控于三级层序内部高位体系域旋回,在沉积晚期(SQ3)则受继承性古地貌影响。
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