录井工程 ›› 2022, Vol. 33 ›› Issue (2): 89-96.doi: 10.3969/j.issn.1672-9803.2022.02.016
李义①, 熊亭②③, 张伟①, 程乐利④⑤
LI Yi①, XIONG Ting②③, ZHANG Wei①, CHENG Leli④⑤
摘要: 陆丰凹陷古近系深层发现大量低渗低阻储层,其孔渗关系复杂、流体性质识别困难,制约了勘探开发进程。以岩石学和物性资料为基础,结合沉积和成岩等多方面研究,对陆丰凹陷文昌组低渗低阻储层的特征和成因开展研究。文昌组储层以岩屑石英砂岩为主,储集空间以次生孔隙为主,由中-小孔和细喉道组成,同类粒度样品的孔渗相关性较好,根据毛细管曲线形态可分为高进汞饱和度、低排驱压力,中等进汞饱和度、中等排驱压力和中进汞饱和度、中-高排驱压力三类。沉积环境以近源辫状河三角洲水下分流河道为主,砂岩成分成熟度和结构成熟度较低,储层质量受沉积条件控制;压实作用造成原生孔隙大量减少,胶结物充填粒间导致物性进一步变差,是造成低孔、低渗的主因。研究结果表明,储层岩性变化快,孔隙结构复杂,孤立孔隙多和联通性差导致束缚水含量较高,以及地层水矿化度高的共同影响,是研究区低对比度储层的发育机理。该认识对本区后续勘探开发作业具有一定的指导作用。
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