阴极发光分析在恢复砂岩碎屑长石含量中的应用
  <font face="Verdana">——鄂尔多斯盆地上古生界和川西凹陷三叠系须家河组的研究</font>

doi:10.11867/j.issn.1001-8166.2008.10.1013

鄂尔多斯盆地山西组、太原组和四川盆地须家河组的砂岩都是中国重要的天然气储集层，其特征是具有极低的长石含量和广泛的方解石胶结作用。对这些地层的样品进行了阴极发光分析并很好地揭示了方解石胶结作用发生前的砂岩组构。研究表明：在这些含煤地层的砂岩中，至少有10%~20%的长石在埋藏成岩过程中被煤系地层的酸性流体所溶解，因而砂岩的高成分成熟度和较大的“粒间孔隙体积”都不是原生的。另外，残余长石的阴极发光性还表明：埋藏成岩过程中被溶解的长石主要是钾长石，说明在风化、搬运和埋藏成岩作用的早期阶段，钾长石是相对稳定的，更多的斜长石是在埋藏前或埋藏成岩作用的早期阶段被溶解的，因而钾长石应是碎屑岩埋藏成岩过程中对次生孔隙贡献最大的长石类型。

关键词: 砂岩储层, 阴极发光, 石溶解, 埋藏成岩作用, 煤系地层

The Shanxi and Taiyuan sandstones in Ordos Basin and the Xujiahe sandstones in Sichuan Basin are very important gas reservoirs in China, which are characterized by very low feldspar contents and are extremely cemented by calcite. The sandstone fabric before calcite cementation happened was revealed by Cathodoluminescence analysis. The result studied here suggests that, dissolved feldspar in buried diagenesis, at least, accounts for 10%~20% of rocks. It is proposed that the high composition maturation and large inter-granular porosity volume of the sandstones in the coal-bearing stratum of both upper Paleozoic in Ordos Basin and Triassic in Sichuan Basin are not original, which should result from the dissolution of feldspar by the acetic fluid in coal-bearing strata. The Cathodoluminescence of remaining feldspar shows that the feldspar dissolved in buried diagenesis is mainly K-feldspar, suggesting that the K-feldspar is relatively stable during weathering and transportation and early buried diagenesis stages, and much plagioclase was dissolved before buried diagenesis. Therefore, the K-feldspar contributed a large amount of secondary porosity to sandstones of Shanxi, Taiyuan and Xujiahe Formations.

Key words: Sandstone reservoirs, Cathodoluminescence, Feldspar dissolution, Buried diagenesis, Coal-bearing strata

中图分类号:

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摘要

Application of Cathodoluminescence Analyse to the Recovery of Feldspar Content in Sandstone—A Case Study of Upper Paleozoic of Ordos Basin and Xujiahe Formation of Western Sichuan Depression,Sichuan Basin