白雪峰,陆加敏,张金友,刘畅,白斌,廖远慧
BAI Xuefeng,LU Jiamin,ZHANG Jinyou,LIU Chang,BAI Bin,LIAO Yuanhui

• 1:多资源协同陆相页岩油绿色开采全国重点实验室
• 2:中国石油大庆油田有限责任公司
• 3:中国石油大庆油田有限责任公司勘探事业部
• 4:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

松辽盆地北部青山口组页岩油主要分布在西部的古龙凹陷和东部的三肇凹陷，在分析埋藏史和热演化史基础上，结合成岩作用、烃类分布分析，明确了热演化控制下2个凹陷页岩油差异富集的主控因素。结果表明：较快速度进入高成熟度阶段致使有机酸作用时间短，古构造高孔渗部位页岩被方解石胶结，造成古龙凹陷页岩长英质纹层致密，物性较差，长时间的中等成熟度阶段为有机酸提供了充足的反应时间，造成三肇凹陷长英质纹层、混合质纹层发育溶蚀孔，物性较好；高成熟阶段促进古龙凹陷页岩中的蒙脱石向伊利石大量转化，形成大量纳米级黏土矿物晶间孔，成熟度较低的三肇凹陷页岩孔隙发育程度相对较差；高成熟度的古龙凹陷气油比较大（500 m~3/m~3），原油密度仅为0.79～0.80 g/cm~3，易于在纳米级小孔隙中有效渗流，中等成熟度的三肇凹陷只有油没有气，原油密度高达0.85～0.88 g/cm~3，在较大孔隙中才可有效渗流；古龙凹陷页岩油的资源“甜点”为纳米孔发育的黏土质层状页岩（孔隙度为5.94%～14.39%，平均为10.14%），长英质纹层发育的页岩只有少量轻烃富集（孔隙度仅为1.22%～9.98%，平均为6.83%），三肇凹陷页岩油的资源“甜点”为溶蚀孔发育的长英质纹层状页岩和混合质纹层状页岩（孔隙度为4.53%～11.89%，平均为7.71%），高于黏土质层状页岩的孔隙度（2.64%～8.85%，平均为6.84%）。研究成果可为松辽盆地页岩油勘探开发及精细甜点评价提供理论参考。
Shale oil in Qingshankou Formation of northern Songliao Basin is mainly distributed in Gulong Sag in the west and Sanzhao Sag in the east. Based on the burial history and thermal evolution history analysis and combined with diagenesis and hydrocarbon distribution studies, main controlling factors of differential shale oil enrichment in these two sags controlled by thermal evolution are clarified. The results show that, rapid entry into high maturity stage resulted in short organic acids behavior, leading to calcite cementation in paleo-structural high porosity and permeability zones, as well as dense felsic laminae of Gulong Sag shale with poor physical properties. Prolonged medium-maturity stage in Sanzhao Sag allowed sufficient organic acids behavior, developing dissolution pores in felsic and mixed laminae with better physical properties. High-maturity evolution stage promoted extensive montmorillonite-to-illite transformation in Gulong Sag shale, forming a large number of nano-scale clay mineral intergranular pores. Shale with low maturity in Sanzhao Sag shows relatively poor pore development. High-maturity Gulong Sag contains large gas-oil ratio of 500 m~3/m~3, with oil density of only 0.79-0.80 g/cm~3, facilitating effective flow in nanopores, whereas medium-maturity Sanzhao Sag contains only oil but no gas, with oil density of up to 0.85-0.88 g/cm~3, requiring larger pores for flow. Shale oil “ sweet spots” in Gulong Sag are clayey laminated shale with nano-pores development(porosity 5.94%-14.39%, average 10.14%), while felsic laminae only have minimal light hydrocarbon enrichment(porosity only 1.22%-9.98%, average 6.83%). Shale oil sweet spots in Qingshankou Formation of Sanzhao Sag are felsic and mixed laminated shale with dissolved pores development(porosity 4.53%-11.89%, average 7.71%), higher than that of clayey laminated shale(porosity 2.64%-8.85%, average 6.84%). The research provides theoretical reference for shale oil exploration and fine evaluation of sweet spots in Songliao Basin.

关键词(KeyWords)： 页岩油;松辽盆地;古龙凹陷;三肇凹陷;资源甜点
shale oil;Songliao Basin;Gulong Sag;Sanzhao Sag;geological sweet spots

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目“热演化对陆相页岩油孔隙结构和烃类差异聚集的控制作用”（42302158）;国家自然科学基金“中高熟陆相页岩油富集理论与绿色有效开发基础研究”（U24B6004）;; 国家自然科学青年科学基金项目“湖相混积岩自生烃作用对致密油成藏有效性的影响”（42202152）;; 中国石油天然气股份有限公司攻关性应用性科技专项“陆相页岩油分类评价与规模增储研究”（2023ZZ15YJ01）;; 黑龙江省“揭榜挂帅”科技攻关项目“古龙页岩储层成岩动态演化过程与孔缝耦合关系研究”（2021ZXJ01A09）

作者(Author): 白雪峰,陆加敏,张金友,刘畅,白斌,廖远慧
BAI Xuefeng,LU Jiamin,ZHANG Jinyou,LIU Chang,BAI Bin,LIAO Yuanhui

DOI: 10.19597/J.ISSN.1000-3754.202510025

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