天然气地球科学 ›› 2021, Vol. 32 ›› Issue (4): 598610.doi: 10.11764/j.issn.1672-1926.2020.12.006
郭春礼1,2(),杨爽1,2,3,4(),王安东1,2,王一婷2,章双龙5,祁星5
Chun-li GUO1,2(),Shuang YANG1,2,3,4(),An-dong WANG1,2,Yi-ting WANG2,Shuang-long ZHANG5,Xing QI5
摘要:
为了研究修武盆地下寒武统荷塘组海相页岩储层及其含气性特征,连续选取富有机质钻井页岩为研究对象,进行有机地球化学分析、岩石学、孔隙度、低温N2吸附、CO2吸附和超临界CH4等温吸附等系列实验。RO值为1.74%~2.32%,平均为2.10%,为高成熟阶段。页岩TOC含量高,平均为3.21%;矿物组成以石英和黏土矿物为主,平均为52.66%和35.56%,并发育少量长石、碳酸盐和黄铁矿。平均孔隙度为2.05%,具低孔特征,平均孔径为8.416 nm,主要发育开放型圆筒状孔隙、层状狭缝形孔隙和细颈广体墨水瓶状孔隙;比表面积和孔体积普遍较高,分别为6.94~46.48 m2/g、0.004 2~0.020 1 cm3/g,其中微孔提供较大的比表面积,与四川盆地龙马溪组页岩数值相近,表明其具有充足的储气空间。研究区不但具有良好的生气物质基础,而且具有较强的CH4吸附能力,平均吸附量为1.71 m3/t;影响吸附的主要因素是TOC含量和孔隙结构,石英为有利因素,黏土矿物对吸附影响微弱。页岩厚度大、埋深较浅,有机质类型以生烃能力强的Ⅰ型为主,脆性矿物含量高,综合认为该区具有较好的页岩气勘探潜力。
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