0 引言
1 页岩气差异富集特征
图2 中国南方五峰组—龙马溪组页岩气主要勘探开发区有利(富集)段分布特征(修改自文献[4],部分数据引自文献[1, 8, 13])Fig.2 Distribution of favorable intervals of Wufeng-Longmaxi formations shale gas from main exploration blocks of shale gas in South China (modified from the Ref. [4]; some data from the Refs. [1, 8, 13]) |
1.1 甜点段厚度差异分布特征
1.2 含气量差异分布特征
图4 中国南方五峰组—龙马溪组页岩气非富集段(a)、有利富集段(含甜点段)(b)、甜点段(c)含气量分布(部分数据引自文献[1, 7-9, 11-13, 19, 29])Fig.4 Distribution of total gas contents from unfavorable interval (a), favorable interval (b), sweet-spot interval (c) of Wufeng-Longmaxi formations shale gas in South China (some data from the Refs.[1, 7-9, 11-13, 19, 29]) |
1.3 页岩有机质差异富集特征
图6 中国南方五峰组—龙马溪组页岩气非富集段(a)、有利富集段(含甜点段)(b)、甜点段(c)TOC含量分布(部分数据引自文献[1, 7-9, 11-13, 19, 32])Fig.6 Distribution of TOC contents from unfavorable interval (a), favorable interval (b), sweet-spot interval (c) of Wufeng-Longmaxi formations shale gas in South China (some data from the Refs. [1, 7-9, 11-13, 19, 32]) |
2 页岩有机质丰度是影响页岩气富集程度的关键因素
图8 中国南方不同区域(典型井)五峰组—龙马溪组页岩气含气量与TOC含量相关性分析(部分数据引自文献[1, 7-9, 11-13, 19, 29])Fig.8 Cross plot between total gas contents and TOC contents of Wufeng-Longmaxi formations shale gas from different exploration blocks (typical gas wells) in South China (some data from the Refs.[1,7-9,11-13,19,29]) |
3 五峰组—龙马溪组有机质及含气量差异富集主控因素探讨
图9 中国南方五峰组—龙马溪组不同层段TOC含量与古生产力指标Babio(a)、缺氧条件指标U/Th(b)和V/Cr(c)及交会图(部分数据引自文献[17, 32, 50, 53, 62])Fig.9 Cross plots between TOC content and Babio concentration (a), TOC content and U/Th ratio (b), TOC content and V/Cr ratio (c) from different intervals of Wufeng-Longmaxi formations shale gas in South China (some data from the Refs. [17, 32, 50, 53, 62]) |