沉积学报2017，Vol.35Issue(4)：772-780,9.DOI:10.14027/j.cnki.cjxb.2017.04.011
渝东北田坝地区五峰-龙马溪组页岩矿物学特征及其油气地质意义
Mineralogical Characteristics and Petroleum Geological Significance of Wufeng-Longmaxi Formation Shale in the Tianba Area, Northeast of Chongqing
摘要
Abstract
Shale samples are from Wufeng-Longmaxi Formation of Tianba area in northeast of Chongqing.The results showed that major components of the Wufeng-Longmaxi Formation mud shale were composed of quartz, clay minerals and feldspar.In addition, other mineral components include Sulfide mineral like pyrite, gypsum and few carbonate.The mineral assemblage revealed that the Wufeng-Longmaxi Formation was composed of neritic shelf deposits that was in favor of the preservation and enrichment of organic matter and provided a good depositional condition for the shale gas reservoirs.Shale reservoir contained much quartz, and brittleness index was high that were conductive to form crack.Comparing adjacent Fuling area and Tianba area, we would find they were similar and the quartz and brittleness mineral content of Tianba shale was greater that of than the Fuling area, however, the clay minerals content and carbonate mineral content of Tianba shale was less than that of the Fuling area.Clay mineral compositions characterization reflected that Wufeng-Longmaxi Formation had already been in a phyllomorphic stage and that was corresponding to a highly mature or postmature evolutionary stage of hydrocarbons and provided with a suitable maturity condition for shale gas formation.Moreover, the Wufeng Formation and Longmaxi Formation were highly poriferous and which provided a better place for the shale gas reservoirs.关键词
页岩气/五峰-龙马溪组/矿物学/沉积学/渝东北/田坝地区Key words
shale gas/Wufeng-Longmaxi Formation/mineralogy/sedimentology/Northeast of Chongqing/Tianba area分类
天文与地球科学引用本文复制引用
杨宇宁,王剑,郭秀梅,熊小辉..渝东北田坝地区五峰-龙马溪组页岩矿物学特征及其油气地质意义[J].沉积学报,2017,35(4):772-780,9.基金项目
国家自然科学基金项目(41030315)National Natural Science Foundation of China, No.41030315 （41030315）
