金成志,董万百,白云风,吕建才,付秀丽,李佳,马生明
JIN Chengzhi,DONG Wanbai,BAI Yunfeng,L■ Jiancai,FU Xiuli,LI Jia,MA Shengming

• 1:大庆油田有限责任公司
• 2:黑龙江省致密油和泥岩油成藏研究重点实验室
• 3:大庆油田有限责任公司勘探事业部
• 4:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

为深化松辽盆地古龙页岩岩相特征及成因认识,以钻井资料为基础,利用岩心观察、薄片鉴定、元素分析等手段,深入分析页岩岩相类型、地质特征、时空展布特征,并结合有机地化分析,探讨松辽盆地北部古龙页岩优势岩相的类型及分布特征。研究认为:按照"有机质丰度+沉积构造+岩石类型"的分类原则,可将松辽盆地北部青山口组页岩岩相划分为5大类11亚类,即页岩相(高有机质层状页岩相、高有机质纹层状页岩相、中有机质纹层状页岩相、低有机质纹层状页岩相)、泥岩相(高有机质块状泥岩相、高有机质纹层状泥岩相、中有机质纹层状泥岩相、低有机质纹层状泥岩相)、粉砂质岩相、灰质岩相及云质岩相;各类岩相分布呈现环带状特征,有利于页岩油富集的优势岩相(高有机质层状页岩相、高有机质纹层状页岩相)分布在齐家—古龙凹陷及长垣西侧带;松辽盆地青山口组为温暖湿润的古气候,大规模湖侵形成了陆源输入弱、缺氧、强还原的淡水—微咸水沉积环境,为有机质的富集以及页岩储层的形成提供了良好的背景条件。研究成果丰富了松辽盆地成熟页岩油勘探理论,为松辽盆地北部页岩油有利富集区优选、井位部署提供了理论依据。
In order to deepen the understanding of the lithofacies characteristics and genesis of Gulong shale in Songliao Basin,on the basis of the drilling data, with the help of the core observation, thin section identification and element analysis, the lithofacies types, geological characteristics, temporal and spatial distribution characteristics of the shale were analyzed, and moreover combined with the organic geochemical analysis, the types and distribution characteristics of the dominant lithofacies of Gulong shale in North Songliao Basin were discussed. The studies show that according to the characteristics of organic matter abundance,sedimentary structure and rock type, Qingshankou-Formation shale lithofacies in North Songliao Basin can be classified into 5 categories and 11 sub-types: shale lithofacies(high-organic-matter layered lithofacies, high-organic-matter laminated lithofacies, medium-organic-matter laminated lithofacies, low-organic-matter laminated lithofacies), mudstone lithofacies(high-organic-matter massive lithofacies, high-organic-matter laminated lithofacies, middle-organic-matter laminated lithofacies, low-organic-matter laminated lithofacies), silty lithofacies, calcareous lithofacies and dolomitic lithofacies. Each type of the lithofacies is distributed in the form of the belt or ring characteristics, the dominant lithofacies(high-organic-matter layered lithofacies, high-organic-matter laminated lithofacies) are distributed in Qijia—Gulong Sag and the west belt of the Placanticline; Qingshankou Formation in Songliao Basin belongs to warm and humid paleoclimate, the large-scale lake transgression has formed fresh water-brackish water sedimentary environment with weak continental input, anoxic and strong reduction, which provides much better background for the accumulation of the organic matter and the generation of the shale reservoirs. The research achievements can enrich the exploratory theory of the mature shale oil in Songliao Basin, and furthermore can provide theoretical evidences for the optimizations of the favorable shale-oil enriched area and the deployment of the well location in North Songliao Basin.

关键词(KeyWords)： 松辽盆地;页岩油;岩相;古地理;古沉积环境
Songliao Basin;shale oil;lithofacies;palaeogeography;palaeo-sedimentary environment

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份公司“十三五”重大科技专项课题“松辽盆地北部石油精细勘探技术完善与规模增储”(2016E-0201)

作者(Author): 金成志,董万百,白云风,吕建才,付秀丽,李佳,马生明
JIN Chengzhi,DONG Wanbai,BAI Yunfeng,L■ Jiancai,FU Xiuli,LI Jia,MA Shengming

DOI: 10.19597/J.ISSN.1000-3754.202005016

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