川南—黔中地区下寒武统页岩气富集条件探讨
发布时间：2019-02-25 15:34
【摘要】：根据川南—黔中地区下寒武统黑色页岩的露头观测与钻井岩心描述、氩离子抛光—扫描电镜、等温吸附等方法所获地球化学和物性资料,探讨了页岩气富集条件。研究区富有机质页岩沉积相为深水陆棚相、中陆棚相等;有机碳含量普遍在2%以上;成熟度介于1.32%~4.78%之间,均值为2.85%;主要发育Ⅰ型干酪根;储集类型主要以微米-纳米孔隙发育为主,裂缝比较发育,孔隙度介于0.24%~11.9%之间,渗透率介于(0.000 087~0.535)×10~(-3)μm~2之间,等温吸附实验测试平均吸附气量为2.74m~3/t。黄页1井现场解析含气量介于0.16~0.99m~3/t之间,平均含气量为0.52m~3/t;金石1井现场解析含气量介于1.51~2.41m~3/t之间,均值为1.8m~3/t。研究表明:四川盆地内下寒武统页岩经历了有利于页岩气成藏的长期浅埋—长期隆升—快速深埋—快速抬升的埋藏史及热演化史且构造相对稳定,导致其具有较好页岩气保存条件;而盆外地区由于经历了多期次的生排烃,同时也遭受了多次构造运动的改造,致使页岩气藏的保存条件遭到不同程度的破坏。因此,优越的物质基础、保存条件等是页岩气富集成藏的主控因素。勘探选区上应往四川盆地内走,选区上要寻找有利于页岩气成藏的埋藏史及热演化史的同时采取"高中找低、强中找弱、好中找厚"的原则。
[Abstract]:Based on the geochemical and physical data obtained from the outcrop observation and drilling core description of the black shale of the Lower Cambrian series, argon ion polishing-scanning electron microscopy and isothermal adsorption, the enrichment conditions of shale gas are discussed. The sedimentary facies of organic-rich shale in the study area is deep-water shelf facies, the middle shelf is equal, the organic carbon content is more than 2%, the maturity is between 1.32% and 4.78%, the average value is 2.85%, the main type 鈪，
本文编号：2430315
[Abstract]:Based on the geochemical and physical data obtained from the outcrop observation and drilling core description of the black shale of the Lower Cambrian series, argon ion polishing-scanning electron microscopy and isothermal adsorption, the enrichment conditions of shale gas are discussed. The sedimentary facies of organic-rich shale in the study area is deep-water shelf facies, the middle shelf is equal, the organic carbon content is more than 2%, the maturity is between 1.32% and 4.78%, the average value is 2.85%, the main type 鈪，
本文编号：2430315
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