D气田群黄流组一段CO_2对储层质量的影响Effect of CO_2 on Reservoir Quality in Huang-1 Member of Huangliu Formation in D Gasfield Group
甘永年;叶青;漆智;郇金来;吴倩;
摘要(Abstract):
综合利用气体组分分析、铸体薄片分析、孔隙定量分析及常规物性分析等手段,对CO_2-地层水-砂岩的反应机理进行了研究。结果表明:早期CO_2溶于水形成碳酸,使得骨架颗粒及早期胶结物溶解形成大量的孔隙,晚期过量的H+消耗使得溶液呈碱性,下伏热流体所携带的HCO_3~-和CO_2水解形成的HCO_3~-与早期地层中的Mg~(2+)、Fe~(2+)化合形成碳酸盐胶结物,以铁白云石为典型代表,在碱性环境下进行沉淀堆积,堵塞孔隙及喉道,综合早期建设性成岩作用及晚期破环性成岩作用,最终降低了储层质量,尤其在CO_2体积分数大于10%时表现最为明显。
关键词(KeyWords): 莺歌海盆地;CO2;黄流组一段;储层质量;铁白云石
基金项目(Foundation): 国家科技重大专项“莺琼盆地高温高压天然气富集规律与勘探开发关键技术”(三期)(2016ZX05024-005)
作者(Author): 甘永年;叶青;漆智;郇金来;吴倩;
Email:
DOI: 10.19509/j.cnki.dzkq.2018.0418
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