天然气工业2017，Vol.37Issue(12)：26-34,9.DOI:10.3787/j.issn.1000-0976.2017.12.004
滇黔北地区五峰组-龙马溪组页岩气富集条件及有利区预测
Enrichment conditions and favorable zone prediction of Wufeng-Longmaxi shale gas reservoirs in the northern Yunnan-Guizhou provinces, China
摘要
Abstract
Marine shale of Upper Ordovician Wufeng-Lower Silurian Longmaxi Fms in the northern Yunnan-Guizhou provinces of China has a good prospect of shale gas resources.At present,however,the enrichment laws of shale gas accumulation under complex geological conditions are not clear.In this paper,the shale gas enrichment conditions (e.g.the depositional environment of Wufeng-Longmaxi Fms,distribution and depth of quality shale,organic geochemical indicators,reservoir parameters and gas bearing property) were analyzed sys tematically based on the latest drilling data,combined with field outcrop profile observation and sample test results.Then the favorable zones of quality shale were predicted and their exploration potential was evaluated.And the following research results were obtained.First,the Wufeng-Longmaxi shale gas reservoirs in this area are deposited in an environment of shallow-deep water shelf,and the thickness and distribution of quality shale are controlled by the depositional environment.The burial depth of bottom boundary is dominated by a historical depositional pattern and the later tectonic movement reworking and it is in the range of 0-4 000 m.And the depositional thickness of quality shale is between 0 and 60 m.Second,the quality shale in this area is characterized by high TOC content (1.0-4.0％),high thermal evolution degrees (over-mature),stable types of organic matters (Type Ⅰ-Ⅱ 1),high hydrocarbon generating intensity (1.0× 108-4.0× 108 m3/km2) and a great hydrocarbon generating potential.Third,the quality shale has a better fracturing potential due to its higher content of brittle mineral,and there are various types of reservoir space with developed micro fractures.And fourth,the preservation condition in this area is locally good and it is geologically favorable for shale gas accumulation.It is concluded that western Yanjin,southern Junlian,Weixin-Xuyong-Gulin and eastern Xishui are the most favorable shale gas exploration zones in the northern YunnanGuizhou provinces of China,and they are superior in the shale gas accumulation of Wufeng-Longmaxi Fms,presenting a great potential of shale gas exploration.关键词
滇黔北地区/晚奥陶世-早志留世/优质页岩/有机地球化学指标/富集条件/有利区预测/勘探潜力Key words
Dianqianbei (Northern Yunnan-Guizhou) provinces/Late Ordovician-Early Silurian/Quality shale/Organic geochemical indicator/Enrichment conditions/Favorable zone prediction/Exploration potential引用本文复制引用
赵瞻,李嵘,冯伟明,余谦,杨瀚,朱丽霞..滇黔北地区五峰组-龙马溪组页岩气富集条件及有利区预测[J].天然气工业,2017,37(12):26-34,9.基金项目
国家科技重大专项“页岩气勘查评价技术试验与应用推广”(编号:2016ZX05034-004)、中国地质调查局油气基础性公益性地质调查二级项目“四川盆地下古生界海相页岩气基础地质调查”(编号:DD20160176). （编号:2016ZX05034-004）
