摘要
中上扬子区志留系龙马溪组是在局限的浅海环境下发育的一套优质烃源岩,尤以川南、川北及渝东南—黔北几个沉积中心黑色页岩最为发育,厚度大、有机质含量高。川南及川北地区干酪根类型以Ⅰ型为主,有机质成熟度为高成熟中晚期,以生成裂解气-湿气为主;渝东南—黔北地区干酪根类型以Ⅱ1型为主,有机质成熟度为过成熟,以生成干气为主。通过分析这几个地区该套地层的有机地球化学参数及钻遇该层位井的录井资料,借鉴北美地区页岩气勘探实践,认为中上扬子区志留系龙马溪组具有形成页岩气气藏的有利条件。建深2井在龙马溪组见到了气测异常及多个异常压力带,这些都显示了中上扬子区龙马溪组页岩气巨大的勘探潜力。
The Longmaxi formation of the Silurian in Middle-Upper Yangtze area is a set of high-quality hydrocarbon source developed in restricted shallow sea environment.Especially the black shale in the deposition centers of southern Sichuan,northern Sichuan,southeastern Chongqing to northern Guizhou is most developed,with big thickness and high organic matter abundance.The type of kerogen in the southern and northern Sichuan is dominated by type-I and the maturity of organic matter is in the middle-late stage of high maturity,which is dominated by generating pyrolysis gas-wet gas;The type of kerogen in the southeastern Chongqing to northern Guizhou is type-Ⅱ1 and the maturity of organic matter reaches overmature,dominated by generating dry gas.According to the organic geochemical parameters in these areas and the logging data from drilling-encountered this formation as well as the shale gas explorative practices from North America,it is suggested that Longmaxi formation of the Silurian in Middle-Upper Yangtze area has favorable conditions to form shale gas reservoirs.There exist gas logging abnormality and many of abnormal pressure zones in this formation in drilling well of Jianshen-2.These show enormous potentials for shale gas exploration of Longmaxi formation in the Middle-Upper Yangtze area.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第4期353-355,共3页
Xinjiang Petroleum Geology
基金
国家专项"中国重点地区页岩气资源潜力及有利目标区优选"
关键词
中上扬子地区
龙马溪组
页岩气
岩相古地理
有机碳含量
Middle-Upper Yangtze area
Longmaxi formation
shale gas
lithofacies paleogeography
organic carbon content
作者简介
张海全（1981-），男，四川德阳人，硕士，石油地质，（Tel）028-83231931（E-mail）zhq433@126．com．
