DIGITAL CORE TECHNOLOGY-BASED MICROSTRUCTURE CHARACTERISTICS AND MAIN CONTROLLING FACTORS OF CONTINENTAL SHALE OIL: A Case Study of Shale in Cretaceous Qingshankou Formation in Songliao Basin
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摘要:
数字岩心技术为大庆齐家-古龙地区青山口组一段的页岩油评价提供了可靠的基础数据，助力了松辽陆相盆地页岩油的勘探突破.针对泥页岩储层超低孔、超低渗的物性特征，综合利用微纳米CT、MAPS和QEMSCAN等数字岩心配套实验，对泥页岩储层岩石学特征、岩相类型、孔隙结构等进行了研究.将青山口组一段划分为5种岩相类型，分别为低有机质纹层状黏土质灰岩相、低有机质纹层状长英质灰岩相、中有机质纹层状长英质页岩相、中有机质夹层粉砂岩相、高有机质纹层状硅质页岩相.青山口组一段主要孔隙类型包括粒间孔、粒内孔和有机质孔.岩石相是青山口组一段孔隙、层理缝发育的主控因素.高有机质纹层状硅质页岩相储集空间主要由粒内孔和层理缝所构成，其孔隙-裂缝系统是青山口组一段页岩油甜点开发的重点层段.
Abstract:Digital core technology, with reliable fundamental data for the evaluation of shale oil in the first member of Qingshankou Formation in Qijia-Gulong Sag, northern Songliao Basin, supports the breakthrough of shale oil exploration in Songliao continental basin. According to the physical properties of ultra-low porosity and ultra-low permeability of shale reservoir, the digital core experiments of micro-nano CT, MAPS and QEMSCAN are used comprehensively to study the lithological characteristics, lithofacies type and pore structure of shale reservoir. The first member of Qingshankou Formation is divided into 5 lithofacies types, including low-TOC lamellar clayey limestone, low-TOC lamellar felsic limestone, medium-TOC lamellar felsic shale, medium-TOC interbedded siltstone and high-TOC lamellar siliceous shale facies. The main pore types are intergranular pore, intragranular pore and organic matter pore. Lithofacies is the main controlling factor for the development of pores and bedding fractures. The reservoir space of high-TOC lamellar siliceous shale facies is mainly composed of intragranular pores and bedding fractures, which is the sweet spot for development of shale oil in the first member of Qingshankou Formation.
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Key words:
- digital core /
- pore structure /
- shale lithofacies /
- Qingshankou Formation /
- Songliao Basin
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