四川盆地南缘长宁地区五峰组—龙马溪组页岩内多源石英对页岩气富集的意义<sup>*</sup>

doi:10.7605/gdlxb.2023.04.068

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摘要

石英是页岩中的常见矿物,具有多种来源或成因,对于页岩气富集具有重要意义。为科学判别四川盆地南缘长宁地区五峰—龙马溪组页岩中石英矿物来源及成因,开展了环境扫描电镜观测、X衍射分析、氦气孔隙度以及总有机碳测定等相关研究工作。结果表明: (1)存在盆外、盆内碎屑石英以及自生石英3种石英类型。(2)盆外(陆源)碎屑石英高通量稀释了龙一³₁小层的有机质丰度,导致TOC随石英含量的增加而呈现先升高、后降低的总体趋势。(3)盆内碎屑石英以浮游生物蛋白石骨架为主,与总有机碳(TOC)线性正相关,表明高丰度浮游生物与高有机质产率相耦合。但由于生物蛋白石相对于有机质在海底弱氧化或氧化背景中具有更高的保存效率,因此盆内碎屑石英与TOC的线性相关系数偏高。(4)与盆内碎屑石英相伴生的有机质生成了大量次生有机孔隙,导致盆内碎屑石英与孔隙度正相关。而黏土转化过程中形成的自生石英填充了部分原生或次生孔隙,导致黏土成因自生石英与孔隙度负相关。该研究成果对长宁地区优化勘探开发部署、指导油区勘探具有重要意义。

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关键词 ：页岩气, 盆内碎屑石英, 有机质保存, 页岩孔隙, 五峰&#x02014, 龙马溪组, 四川盆地

Abstract：

Quartz is a common mineral in shale,but it has a complex origin,which is of great significance for shale gas enrichment. It is particularly tricky to identify the quartz origin after the diagenetic process. In order to identify the sources and genesis of quartz minerals in the shale of Wufeng-Longmaxi Formation in Changning area,southern Sichuan Basin,environmental scanning electron microscope(SEM),X-ray diffraction(XRD),and helium porosity and total organic carbon(TOC)were studied. The results show that: (1)There are three types of quartz,including extrabasinal,intrabasinal,and authigenic quartz in the Wufeng-Longmaxi shale of the Changning area,the southern Sichuan Basin. (2)The high flux of extrabasinal(terrigenous)quartz diluted the abundance of organic matter in the 3rd layer of Long 1 member,resulting in a general trend of TOC first increasing and then decreasing with the increase of quartz content. (3)Intrabasinal quartz content correlates positively to TOC content,suggesting that the high abundance of plankton opal skeleton was coupled with the high productivity of organic matter. However,due to the higher preservation efficiency of biological opals compared with organic matter in the weak oxidation or oxidation background of the seabed,the correlation coefficient between clastic quartz and TOC is abnormally high. (4)Intrabasinal quartz is positively correlated with helium porosity because of the generation of secondary organic pores by the thermal cracking of organic matter that was initially produced with intrabasinal quartz. However,authigenic quartz generated by clay mineral transformation is negatively correlated with helium porosity,which is due to the filling of some primary or secondary pores by authigenic quartz.

Key words： shale gas intrabasinal quartz organic matter preservation shale pore Wufeng-Longmaxi Formations Sichuan Basin

收稿日期: 2022-09-22

ZTFLH:

P618.13

基金资助:

*国家自然科学基金项目“五峰—龙马溪组页岩孔隙结构的构造压实调整机制研究”(编号: 42072184)和中国石油—西南石油大学创新联合体科技合作项目(编号: 2020CX010300)联合资助

通讯作者: 刘睿,男,1989年生,副研究员,长期从事油气成藏机理、非常规油气地质研究。E-mail: Liurui@outlook.com。

作者简介: 陈增裕,男,1999年生,西南石油大学硕士研究生,从事非常规油气地质研究。E-mail: 1952253861@qq.com。

引用本文:

陈增裕,刘睿,谭秀成等. 四川盆地南缘长宁地区五峰组—龙马溪组页岩内多源石英对页岩气富集的意义^*[J]. 古地理学报, 2023, 25(4): 920-930.

CHEN Zengyu,LIU Rui,TAN Xiucheng et al. Implications of multi-source quartz on shale-gas enrichment in the Wufeng-Longmaxi shale of Changning area in southern margin of Sichuan Basin, China[J]. JOPC, 2023, 25(4): 920-930.

链接本文:

http://journal09.magtechjournal.com/gdlxb/CN/10.7605/gdlxb.2023.04.068 或 http://journal09.magtechjournal.com/gdlxb/CN/Y2023/V25/I4/920

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