大庆石油地质与开发2025，Vol.44Issue(4)：12-19,8.DOI:10.19597/J.ISSN.1000-3754.202405008
齐家-古龙凹陷青山口组细粒沉积岩岩相类型、特征及分布规律
Lithofacies types,characteristics,distribution law of fine-grained sedimen-tary rocks of Qingshankou Formation in Qijia-Gulong Depression
摘要
Abstract
In order to clarify lithofacies types,characteristics and distribution law of fine-grained sedimentsary racks of Qingshankou Formation in Qijia-Gulong Sag,principles for shale facies division are established based on methods of fine core description,thin section identification and element analysis to deeply analyze lithofacies types,geologi-cal characteristics and spatial distribution law of Gulong shale.Controlling factors of shale facies formation in Qijia-Gulong Sag are discussed combined with study of paleosedimentary environment.The results show that,according to classification principle of"sedimentary structure+rock type",shale facies of Qingshankou Formation in Qijia-Gu-long Sag are divided into 5 types,including thin laminar shale facies,thick laminar shale facies,massive siltstone fa-cies,massive limestone facies and massive dolomite facies.Affected by palaeogeomorphology and provenance sup-ply,all types of lithofacies are distributed in semi-circular belt.Paleosedimentary environment during deposition pe-riod of Qingshankou Formation in Songliao Basin is analyzed from the aspects of paleoprovenance,paleogeomorphol-ogy,paleoclimate,paleosalinity,paleowater depth and paleooxidation-reduction.At that time,the warm and humid paleoclimate of Songliao Basin promoted biological proliferation.Large-scale lacustrine transgression formed fresh-brackish sedimentary environment with weak terrestrial input,anoxia and strong reduction,providing favorable back-ground for organic matter enrichment and shale reservoirs formation.The research enriches the theory of mature shale oil exploration in Songliao Basin,and provides theoretical basis for further optimization of favorable shale oil enrichment areas and well deployment in northern Songliao Basin.关键词
齐家-古龙凹陷/青山口组/细粒沉积岩/岩相类型/有利岩相/分布规律Key words
Qijia-Gulong Sag/Qingshankou Formation/fine-grained sedimentary rock/lithofacies types/favor-able lithofacies/distribution law分类
能源科技引用本文复制引用
白云风,艾鑫..齐家-古龙凹陷青山口组细粒沉积岩岩相类型、特征及分布规律[J].大庆石油地质与开发,2025,44(4):12-19,8.基金项目
黑龙江省"百千万"工程科技重大专项"松辽盆地北部古龙页岩油成藏条件及甜点分布规律研究"(2020ZX05A0023) （2020ZX05A0023）
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). （2023ZZ15YJ01）
