岩性油气藏 ›› 2019, Vol. 31 ›› Issue (3): 4554.doi: 10.12108/yxyqc.20190306
段治有1,2,3, 李贤庆1,2, 陈纯芳3, 马立元3, 罗源3,4
DUAN Zhiyou1,2,3, LI Xianqing1,2, CHEN Chunfang3, MA Liyuan3, LUO Yuan3,4
摘要: J58井区下石盒子组是杭锦旗地区致密砂岩气勘探开发的重点层段,目前对其气水分布关系以及影响因素认识不清,极大地制约了天然气的有效开发。在研究区地质特征研究的基础上,通过对该区30余口井的测井资料、试气资料及地层水化学资料的综合分析,弄清了J58井区的气水分布规律及主控因素。结果表明:该区地层水矿化度为24 176~76 917 mg/L,地层水水型为CaCl2型,反映了地层水封闭性好,有利于天然气的聚集和保存。纵向上气水分异不明显,气水层连续性差,多数为气水同层,盒1段气层较发育。平面上气层集中分布于河道砂体连片区,水层主要位于砂体边部。气水分布主要受生烃强度、沉积相、有效砂体厚度及含砾砂岩厚度等因素控制,气层主要分布在生烃强度大于15亿m3/km2的区域,储集层距烃源岩越近,气层相对更发育;沉积相、有效砂体厚度和含砾砂岩厚度进一步控制着气产量及气、水层的展布范围。该研究成果对确定研究区天然气有利靶区具有指导作用。
中图分类号:
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