梁峰,朱炎铭,漆麟,王红岩,拜文华,马超,张琴,会英,武瑾
Liang Feng,Zhu Yan-ming,Qi Lin,Wang Hong-yan,Bai Wen-hua,Ma Chao,Zhang Qin,Cui Hui-ying,Wu Jin
摘要:
利用露头、钻井及岩心等资料,以地球化学、储层、气体成因以及构造保存条件等为重点研究对象,对湖南省常德地区牛蹄塘组页岩气的成藏条件开展了系统分析。研究表明:该区域牛蹄塘组富有机质页岩具有机碳含量高、厚度大、热演化程度普遍较高的特点;页岩的有效孔隙度为2%~5%,储集空间主要以基质孔隙为主,朗格缪尔体积分布于1~3.5m 3/t之间;盖层厚度较大(>200m),具备形成页岩气的生、储、盖条件。分析了常德1井产水产气的原因,指出所产气、水主要产自牛蹄塘组底部富有机质页岩中的封闭裂缝体系中,处于地层水交替阻滞带,所产烃类气体主要为原油裂解气,非烃类气体主要为过成熟阶段产物,并混入了部分大气,氦气为壳源无机成因。明确了常德地区页岩气成藏过程及散失模式,认为构造破坏、地层水散失和扩散作用是页岩气散失的主要途径,页岩的含气性主要受构造及保存条件控制。优选常德1井以西(地层水交替阻滞带以下)保存条件较好的区域为页岩气分布的有利区,具有较大的资源潜力。
中图分类号:
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