张新顺;黄志龙;朱建成;吴红烛;

• 1:中国石油勘探开发研究院

• 2:中国石油大学(北京)地球科学学院

• 3:中海石油(中国)有限公司湛江分公司

• 4:浙江省地球物理地球化学勘查院

摘要(Abstract)：

针对莺歌海盆地海口A区虽然具有较为良好的油气成藏条件,但预探结果显示为低丰度气藏的问题,采用储层孔渗实验、扫描电镜镜下观察、黏土矿物质量分数测定和储层孔隙度恢复等方法,分析海口A区储层特征,结合埋藏史分析成岩演化特征,根据天然气成藏条件分析天然气低丰度影响因素.结果表明:海口A区三亚组储层主要为分选差、磨圆差的粉砂岩,具有中低孔、低渗特点,现今处于中成岩B期,孔隙以粒间溶蚀孔、铸模孔和粒内溶蚀孔为主;储层在黄流组沉积末期已致密,后因酸性水进入,孔隙度增加;储层天然气主要来源于三亚组,充注期为2Ma左右,成藏期储层致密是导致该区天然气低丰度的主要原因.该结论为在莺歌海盆地寻找优质储层、改善开发效果提供参考.

关键词(KeyWords)：储层特征;天然气;低丰度;成岩作用;孔隙度演化;海口A区;莺歌海盆地

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2011ZX05023-004-008)

作者(Author):张新顺;黄志龙;朱建成;吴红烛;

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