PETROLOGY AND LITHOFACIES OF SHALE FROM THE FIRST MEMBER OF QINGSHANKOU FORMATION IN SANZHAO SAG, SONGLIAO BASIN: A Case Study of SYY-3 Well
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摘要:
以松辽盆地三肇凹陷松页油3井青山口组一段泥页岩为例，对其沉积构造、有机质丰度及矿物组成等岩石学特征关系进行研究.结果表明，三肇凹陷青一段泥页岩发育块状构造和纹层状构造两种沉积构造；TOC含量介于0.50%~6.82%，平均值为3.16%，S1+S2介于2.01×10-3~49.41×10-3，平均值为23.02×10-3，总体为好-最好的烃源岩；矿物组成以长英质矿物为主，黏土矿物次之，碳酸盐矿物、黄铁矿含量较低.基于岩石学特征研究，按照"有机质丰度-岩石沉积构造-矿物组成"分类标准，将青山口组一段划分为9类岩相，其中高有机质纹层状长英质泥页岩岩相具有较好的生烃潜力，是三肇凹陷页岩油勘探的最有利的岩相类型.
Abstract:Taking the shale from the first member of Qingshankou Formation in SYY-3 well of Sanzhao sag in Songliao Basin as an example, the paper studies the petrological characteristics, including sedimentary structure, organic matter abundance and mineral composition. The results show that the shale develops massive structure and laminated structure are, with TOC of 0.50%-6.82% (averagely 3.16%) and S1+S2 of 2.01×10-3-49.41×10-3 (averagely 23.02×10-3), generally belonging to good-best source rock. The mineral composition is mainly felsic mineral, followed by clay, with low content of carbonate and pyrite. Based on the petrological characteristics, the first member of Qingshankou Formation can be divided into 9 types of lithofacies by the classification criteria of organic matter abundance-sedimentary structure-mineral composition, among which the laminated felsic shale with high TOC has good hydrocarbon generation potential, serving as the most favorable lithofacies for shale oil exploration in Sanzhao sag.
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Key words:
- Sanzhao sag /
- first member of Qingshankou Formation /
- sedimentary structure /
- TOC /
- mineral composition /
- lithofacies
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表 1 松页油3井青一段典型泥页岩岩相特征表
Table 1. Lithofacies characteristics of typical shale from the 1st member of Qingshankou Formation in SYY-3 well
序号 岩相类型 岩心特征 微观特征 特征描述 TOC/% 矿物组成/% 1 低有机质块状钙质泥页岩 
块状，碳酸盐矿物为主，TOC含量低 ＜1 黏土矿物＜15
长英质＜25
碳酸盐类＞602 中有机质块状钙质泥页岩 
块状，碳酸盐矿物为主，TOC含量中等 1~2 黏土矿物＜15
长英质＜25
碳酸盐类＞603 中有机质块状长英质泥灰岩 
块状，长英质和碳酸盐矿物为主，TOC含量中等 1~2 黏土矿物＜26
长英质＜45
碳酸盐类30~604 中有机质块状长英质泥页岩 
块状，长英质矿物为主，TOC含量中等 1~2 黏土矿物＜50
长英质＞35
碳酸盐类＜305 中有机质纹层状长英质泥页岩 
纹层状，长英质矿物为主，TOC含量中等 1~2 黏土矿物＜50
长英质＞35
碳酸盐类＜306 高有机质块状钙质泥页岩 
块状，碳酸盐矿物为主，TOC含量高 ＞2 黏土矿物＜15
长英质＜25
碳酸盐类＞607 高有机质块状长英质泥页岩 
块状，长英质矿物为主，TOC含量高 ＞2 黏土矿物＜50
长英质＞35
碳酸盐类＜158 高有机质纹层状长英质泥灰岩 
纹层状，长英质和碳酸盐矿物为主，TOC含量高 ＞2 黏土矿物＜26
长英质＜45
碳酸盐类30~609 高有机质纹层状长英质泥页岩 
纹层状，长英质矿物为主，TOC含量高 ＞2 黏土矿物＜50
长英质＞35
碳酸盐类＜30
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