石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (5): 1024-1038.doi: 10.11743/ogg20220502
胡宗全1,2,3(), 杜伟1,2,3, 朱彤1,2,3, 刘曾勤1,2,3
收稿日期:
2022-05-07
修回日期:
2022-07-20
出版日期:
2022-10-01
发布日期:
2022-09-02
第一作者简介:
胡宗全(1971—),男,教授级高级工程师,沉积与油气储层、致密砂岩与页岩油气地质勘探。E?mail: 基金项目:
Zongquan Hu1,2,3(), Wei Du1,2,3, Tong Zhu1,2,3, Zengqin Liu1,2,3
Received:
2022-05-07
Revised:
2022-07-20
Online:
2022-10-01
Published:
2022-09-02
摘要:
以四川盆地及其周缘五峰组-龙马溪组一段页岩为研究对象,通过对页岩气测录井资料及岩心和露头样品分析测试数据的对比分析,开展了层序地层划分与对比、岩相分类与识别、沉积微相-岩相分布规律研究。研究认为,五峰组-龙马溪组一段页岩可划分为3个三级层序(SQ1,SQ2和SQ3),细分为7个体系域,优质页岩主要分布于3个层序的海侵体系域(TST),其中SQ2-TST优质页岩发育范围最广,其岩相类型主要为富有机质硅质页岩、高有机质含灰硅质页岩和中-高有机质含硅粘土质页岩等。同时明确了不同类型无机矿物的区域分布规律,靠近川中古陆和黔北隆起区域碳酸盐矿物含量相对较高,随着水体深度的增加,碳酸盐矿物含量逐渐降低,生物成因石英含量逐渐增加。以SQ2-TST为例,以3种主要矿物(石英、粘土和碳酸盐)含量等值线图、总有机碳含量(TOC)等值线图为基础,结合地球化学参数(Th/U)和地层厚度等参数等值线图,编制了SQ2-TST沉积相-岩相平面分布图。四川盆地及其周缘SQ2-TST沉积时期,在川中古陆、黔北隆起和川北古陆周缘,主要发育中-低有机质粘土质页岩和中-低有机质含灰硅质粘土质页岩,在川中古陆与黔北隆起所围限的川南深水陆棚亚相区主要发育富有机质含灰硅质粘土质页岩,而涪陵地区向川东北延伸区域主要发育富有机质硅质页岩。
中图分类号:
表2
四川盆地及其周缘五峰组-龙马溪组一段层序地层特征"
三级层序 | 体系域 | 岩性 | 测井 | 古生物 | 地球化学 | ||
---|---|---|---|---|---|---|---|
矿物成分 | 接触关系 | GR曲线形态 | Th/U | 笔石带 | TOC/% | ||
龙马溪组 一段上部(SQ3) | HST | 含粉砂质粘土质岩、含灰质粘土质页岩 | 顶突变 | 箱形持续加积型 | >2 | LM8 | 1~2 |
TST | 粘土质页岩、(含灰质)粘土质页岩 | 底突变 | 齿形退积-进积交互型 | 1~2 | LM7 | 2~3 | |
龙马溪组 一段下部 (SQ2) | LHST | 上部粉砂质页岩、下部灰质粘土质页岩 | 顶突变 | 箱形持续加积型 | >2 | LM5—LM6 | 上部1~2, 下部2~3 |
EHST | 粘土质硅质页岩、含灰质硅质页岩 | 渐变 | 橄榄形退积-进积型 | 1~2 | LM4—LM5 | 2~4 | |
TST | 硅质页岩 | 底突变 | 指状-箱状退积型 | <1 | LM1—LM3 | >4 | |
五峰组(SQ1) | HST | 介屑灰岩 | 顶突变 | 漏斗形退积型 | <1 | WF4 | <1 |
TST | 上部硅质页岩、下部灰质粘土质页岩 | 底渐变或突变 | 漏斗形退积型 | <1 | WF1—WT3 | 上部>2,下部1~2 |
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