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涪陵海相页岩气和元坝—兴隆场湖相页岩气 富集条件差异性分析
Difference of accumulation conditions between Fuling marine shale gas and Yuanba- Xinglongchang lacustrine shale gas
肖继林1 魏祥峰1 李海军2
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作者单位:中国石油化工股份有限公司勘探分公司
中文关键字:四川盆地 页岩气 富集条件 海相 湖相 晚奥陶世—早志留世 早侏罗世
英文关键字:Sichuan Basin; Shale gas; Accumulation condition; Marine facies; Lacustrine facies; Late Ordovician-early Silurian; Early Jurassic
中文摘要:以四川盆地下古生代海相五峰—龙马溪组和湖相下侏罗统大安寨段泥页岩为研究对象,在岩心观察和样品实验数
据分析的基础上,对海、湖相页岩气在富集条件的差异性进行了精细对比研究,明确了富集高产的主控因素。结果表明:①五
峰—龙马溪组早期陆内拗陷深水陆棚滞留闭塞页岩发育模式,有利于大规模的富有机质泥页岩的形成,富有机质泥页岩具有“高
TOC、高孔隙度、富硅质”的特点,同时表现出“高TOC、富有机孔、高含气量”以及“高TOC、高硅质”良好的耦合关系,但
其对保存条件要求严格;②自流井组大安寨段湖相页岩气虽然普遍具有异常高压的特征,但分布于浅湖、半深湖—深湖相带的富
有机质泥页岩连续性差、岩相丰富,不同岩相的TOC、物性以及矿物成分等参数值分异性高,加之有机孔隙总体不发育,含气量
较低,TOC 与黏土矿物呈明显的正相关关系,使其页岩气富集条件总体不利。结论认为:①在明确海、湖相页岩气差异性特点的
基础上,有利相带暗色泥页岩是海、湖相页岩气富集高产的基础;②良好的保存条件是海相页岩气高产的关键;③有利的岩相耦
合微裂缝发育更有利于湖相页岩气的高产。



英文摘要: Taking the marine shale of Lower Paleozoic Wufeng and Longmaxi formations and the lacustrine shale of Lower Jurassic
Daanzhai Member in Sichuan Basin as examples, we carried out core observation and sample analysis, compared the differences of accumulation
conditions between these marine and lacustrine shale gas, and defined the main factors affecting shale-gas accumulation or
high yield. Results show that (1) for Wufeng and Longmaxi formations, the retained and cutoff shale development modes in the deepwater
continental shelf of intracontinental depression in the early stage were beneficial to forming massive shale with rich organic matter.
And the shale is characterized by "high TOC, organic porosity, and gas content" well coupling with "high TOC and silicate". However,
its preservation to form shale-gas reservoirs also needs higher requirements; (2) in Daanzhai Member of Ziliujing Formation, the lacustrine
shale gas is commonly characterized by abnormal pressure. But the shale with rich organic matter, which is distributed in shallow
lacustrine, and semideep and deep lacustrine facies, is featured by poor continuity, high differences among TOC, physical properties,
and mineral composition in various lithofacies, undeveloped organic pores, lower gas content, and obviously positive correlation between
TOC and clay minerals, all which are bad for shale-gas accumulation. It is concluded that, dark shale in favorable facies belts is
the base for marine and lacustrine shale-gas accumulation; better preservation conditions are the key to marine shale-gas accumulation,
and favorable lithofacies coupled with developed micro-fractures are more conducive to high yield of lacustrine shale gas.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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