松辽盆地北部林甸地区青山口组一段页岩储层特征及主控因素

Reservoir characteristics and main controlling factors of the first member of QingshankouFormation shale in the Lindian Area，Northern Songliao Basin

摘要

以松辽盆地北部林甸地区青山口组一段（青一段）页岩为研究对象，采用岩心观察、薄片鉴定、有机地球化学分析、 X 线衍射全岩矿物和扫描电镜等方法，分析林甸地区青一段页岩沉积构造、总有机碳质量分数、热解生烃潜量、矿物组分和储集物性等，构建跨区域（林甸-古龙-三肇凹陷）东西向、南北向 3 条剖面，研究页岩储层特征及主控因素。结果表明：林甸地区青一段发育黏土质页岩、长英质页岩、钙质页岩、钙质-长英质混合页岩、黏土-长英质混合页岩、碳酸盐岩、粉砂岩 7 种岩石类型，优势页岩为黏土质页岩、长英质页岩；岩石矿物分为黏土质矿物、碳酸盐矿物及石英和长石矿物 3 类，其中石英和长石矿物质量分数最高，平均为 52.0% ；页岩储层具有低孔隙度、低渗透率特征，页岩有效孔隙度介于 4.0 \mathrm{\%} \sim 6.5 \mathrm{\%} ，渗透率分布在 ( 0.101 \sim 0.550 ) \times {10}^{-3} \mu {\mathrm{m}}^2 之间，存在明显的非均质性；页岩油为源一储一体型中低熟油，页岩油以滞留富集为特征，有机质类型以I型为主，岩石类型、有机质类型、有机质丰度和物性特征对含油性具有明显控制作用。该结果为认识林甸地区青山口组页岩发育储层特征、页岩油富集特点和勘探潜力提供参考。

Abstract

The first member of Qingshankou Formation shale in the Lindian Area in the northern part ofthe Songliao Basin was taken as the object of study, and the sedimentary structure, total organic carbonmass fraction, pyrolytic hydrocarbon potential, mineralogical fractions and reservoir properties of thefirst member of Qingshankou Formation shale in the Lindian Area were analyzed on the bas, of the methods of rock-core observation, flake identification, organic geochemistry, X-ray diffraction of thewhole-rock minerals and scanning electron microscopy. We constructed three cross-regional(Lindian-Gu-long-Sanzhao Depression) east-west and north-south profiles to study the shale reservoir characteristicsand main controlling factors. The study shows 7 rock types are developed in the first member of Qings-hankou Formation in Lindian Area, in order of clay shale, felsic shale, calcareous shale, calcareous-siltymixed shale, clayey-silty mixed shale, carbonate rock and siltstone, with the dominant shale being clayshale and felsic shale, among which the shale petrographic mineralogical composition is characterized bythe highest content of quartz and feldspar with the average content of 52.0%.The shale reservoir in Lin-dian Area is characterized by low porosity and low permeability, the effective porosity of shale is be-tween 4,0%-6.5%, the permeability of shale is distributed between(0.101-0.550)×10^-3um2, and there exists obvious non-homogeneity.The shale oil in the first member of Qingshankou Formation in LindianArea is a source and reservoir type of medium-low maturity oil, and it is characterized by stagnant en-richment, and the rock type, organic matter type, organic matter abundance, and physical characteris-tics have obvious control over the oil content. The results are of positive significance for recognizing thereservoir characteristics of shale development, shale oil enrichment characteristics and exploration po-tential of Qingshankou Formation in the Lindian Area, and provide theoretical guidance for realizing thebreakthrough of land-phase shale oil in this area.

关键词

松辽盆地 / 林甸地区 / 青山口组 / 页岩油 / 储层特征 / 控制因素

Key words

Songliao Basin / Lindian Area / Qingshankou Formation / shale oil / reservoir characteristics / controlling factors

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基金资助

国家自然科学基金项目(41902149)

中国石化科技部项目(P23092)