石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (4): 909-918.doi: 10.11743/ogg20210412
姜涛1,2,3,4,5(), 金之钧1,2,3,4,6, 刘光祥3,4, 胡宗全3,4, 刘全有3,4, 刘忠宝3,4, 王鹏威3,4, 王濡岳3,4, 杨滔3,4,7, 王冠平3,4
收稿日期:
2019-07-25
出版日期:
2021-08-28
发布日期:
2021-08-27
作者简介:
姜涛(1988-), 男, 博士研究生, 非常规油气勘探开发。E-mail: 基金资助:
Tao Jiang1,2,3,4,5(), Zhijun Jin1,2,3,4,6, Guangxiang Liu3,4, Zongquan Hu3,4, Quanyou Liu3,4, Zhongbao Liu3,4, Pengwei Wang3,4, Ruyue Wang3,4, Tao Yang3,4,7, Guanping Wang3,4
Received:
2019-07-25
Online:
2021-08-28
Published:
2021-08-27
摘要:
四川盆地元坝地区自流井组页岩是陆相页岩气的主要研究层段之一,目前正处于勘探攻关的重要阶段。页岩孔隙结构是评价页岩储层储集能力的重要指标,是明确页岩气富集机理的关键。采用总有机碳含量、全岩X衍射、N2吸附-高压压汞孔径联合实验及氩离子抛光-扫描电镜等多种实验测试方法对其孔隙结构进行了定量表征。结果表明:自流井组页岩粘土矿物含量高,介于38.8%~67.3%,平均为52.8%。孔隙类型以矿物基质孔隙为主,有机质孔次之,微裂缝局部发育;N2吸附滞后环反应主要发育平行板状狭缝型孔隙,同时含有少量墨水瓶型孔;主要孔径分布区间为中孔,大安寨段与东岳庙段相比,由于微孔比例偏低,宏孔比例偏高,所以中值孔径与孔体积较大、比表面积相对较小。自流井组页岩储层孔体积与比表面积主要由粘土矿物决定,孔体积和比表面积与TOC呈负相关或无关,主要由于有机质内镜质体与丝质体不发育孔隙,以及可溶有机质对孔体积和吸附位的占据。研究成果对研究区陆相页岩气的研究与勘探具有重要的借鉴和指导意义。
中图分类号:
图3
四川盆地元坝地区元陆4井自流井组页岩孔隙类型 a.大安寨段,埋深3 748.23 m,富氢镜质体发育有机质孔;b.东岳庙段,埋深4 051.81 m,镜质体结构致密不发育有机质孔隙;c.大安寨段,埋深3 786.53 m,沥青内发育有机质孔隙;d.东岳庙段,埋深4 051.81 m,粒间孔;e.大安寨段,埋深3 790.14 m,有机质结构致密,粒间孔发育;f.大安寨段,埋深3 760.75 m,粒间孔充填沥青,沥青内见有机质孔隙发育;g. 大安寨段,埋深3 790.14 m,粘土矿物间微孔;h.大安寨段,埋深3 754.39 m,粘土矿物间微孔;i.东岳庙段,埋深3 985.42 m,有机质结构致密,粘土矿物间微孔发育;j.大安寨段,埋深3 790.14 m,铁白云石内发育溶蚀孔隙;k.大安寨段,埋深3 790.14 m,介壳内发育丰富溶孔;l.大安寨段,埋深3 748.23 m,黄铁矿晶间孔隙"
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