SEDIMENTARY MICROFACIES OF QUANTOU FORMATION-QINGSHANKOU FORMATION OF SHALE OIL PARAMETRIC WELLS IN QIJIA-GULONG AREA
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摘要:
沉积微相发育特征对页岩油赋存及开发潜力具有重要的影响.以松辽盆地北部齐家-古龙地区松页油1井和松页油2井泉头组四段上部-青山口组二三段下部岩心为研究对象，通过大比例尺岩心观察和精细描述，以岩心岩性、层理构造、化石、含有物、电性特征为依据，开展沉积微相研究.研究认为，松页油1井和松页油2井岩心中，主要发育湖泊相沉积，分为浅湖和半深湖-深湖2种沉积亚相，可进一步识别出浅湖滩坝砂、介壳滩、泥质浅湖、半深湖-深湖泥和油页岩5种沉积微相.青一段下部主要发育半深湖-深湖亚相，浅湖亚相主要分布在青一段上部、青二三段下部和泉四段上部层位.泥质浅湖微相、半深湖-深湖泥微相以及油页岩微相均是有利于页岩油形成的沉积微相类型.
Abstract:The development characteristics of sedimentary microfacies significantly affect the occurrence and exploitation of shale oil. Taking the cores from the upper part of 4th Member of Quantou Formation and lower part of 2nd-3rd members of Qingshankou Formation from SYY1 and SYY2 wells in Qijia-Gulong area of northern Songliao Basin as the research object, the paper studies the sedimentary microfacies through large-scale core observation and fine description based on core lithology, bedding structures, fossils, inclusions and electrical characteristics. It is concluded that lacustrine facies deposits are mainly developed in the cores of SYY1 and SYY2 wells, which can be divided into two sedimentary subfacies of shallow lake and semi-deep-deep lake, with five sedimentary microfacies including beach-bar sands in shallow lake, ostracoda beach, argillaceous shallow lake, semi-deep-deep lake mud and oil shale. The lower part of 1st Member of Qingshankou Formation is dominated by semi-deep-deep lake subfacies; while the upper part of 1st Member and lower part of 2nd-3rd members of Qingshankou Formation and upper part of 4th Member of Quantou Formation, by shallow lake subfacies. The latter three microfacies are all favorable to form shale oil.
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Key words:
- Qijia-Gulong area /
- Qingshankou Formation /
- Quantou Formation /
- sedimentary microfacies /
- shale oil /
- Songliao Basin
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表 1 松页油1井和松页油2井岩心沉积微相类型划分
Table 1. Classification of sedimentary microfacies of the cores from SYY1 and SYY2 wells
沉积相 沉积亚相 沉积微相 主要岩性 主要层理构造 测井曲线特征 湖泊相 浅湖 浅湖滩坝砂 灰色、深灰色粉砂岩、灰质粉砂岩、泥质粉砂岩 波状层理 高阻、低伽马、低时差、高密度 介壳滩 介形虫层 高阻、低伽马、低时差、高密度 泥质浅湖 绿灰色、深灰色粉砂质泥岩、泥质粉砂岩、泥岩 水平层理、生物扰动构造 较低阻、较高伽马、较高时差、较低密度 半深湖—深湖 半深湖—深湖泥 深灰色、灰黑色、黑色泥岩、粉砂质泥岩 水平层理 低阻、高伽马、高时差、低密度 油页岩 灰黑色、黑色泥岩 水平层理 高阻、高伽马、高时差、低密度 
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