歧口凹陷歧北次凹沙三段页岩油富集因素分析  

Analysis of shale oil enrichment factors in the Es3 of Qibei subsag,Qikou Sag

作　　者：赵军[1] 于春勇 马建英[1] 周可佳[1] 王昌丽[1] 孟立娜[1] ZHAO Jun;YU Chunyong;MA Jianying;ZHOU Kejia;WANG Changli;MENG Lina(Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin,300280,China;No.1 Mud Logging Company,BHDC,CNPC,Tianjin 300280,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院 [2]中国石油渤海钻探第一录井公司

出　　处：《录井工程》2025年第1期123-129,共7页Mud Logging Engineering

基　　金：国家重点研发计划项目“地质资源精准开发风险预测的大数据智能分析技术及平台建设”(编号:2022YFF0801204);中国石油天然气股份有限公司前瞻性基础性科技项目“成熟探区精细勘探关键技术研究”(编号:2021DJ0702)。

摘　　要：页岩油作为非常规能源之一,在助力油田增储上产方面作用突出。然而,页岩油开采难度较大,施工成本较高,需要明确页岩油富集因素,以便实现精准定位、效益开发。针对渤海湾盆地歧口凹陷歧北次凹沙三段页岩层系,通过开展不同岩相类型的有机质和滞留烃对比分析,明确具有工业价值的含油气岩相类型;通过建立矿物组分与游离烃的交会关系,分析裂缝数量与纹层数量的相关性,明确页岩油赋存空间的主要控制因素。研究表明,该区域沙三段以纹层状页岩和层状泥页岩为页岩油主要的富集岩相,孔隙结构较好,有机碳含量高,层理缝密度大,滞留烃和游离烃含量较高,具有生产开发优势。研究认为,岩相类型、有机质类型和丰度、热演化程度、岩石矿物组成、纹层数量是影响页岩油富集高产的主要因素。As one of the unconventional energy sources,shale oil is important in increasing reserves and production.However,due to the difficulty in mining shale oil and the high construction cost,it is necessary to clarify the shale oil enrichment factors in order to achieve accurate positioning and effective development.Based on the shale layers of the Es3 of Qibei subsag in Qikou Sag of the Bohai Bay Basin,comparative analysis of organic matter and occluded hydrocarbons of different lithofacies types is carried out,and the lithofacies types containing oil and gas with industrial value are clarified.By establishing the intersection relationship between mineral composition and free hydrocarbons,and analyzing the correlation between the number of fractures and laminae,the main controlling factors in the shale oil occurrence space are clarified.Research shows that the laminated shale and bedded mud shale are the main enriched lithofacies of shale oil in Shahejie Formation of the area,with good pore structure,high organic carbon content,high density of bedding fractures,and high occluded and free hydrocarbon content,which has production and development advantages.The study shows that lithofacies type,organic matter type and abundance,thermal evolution degree,rock minerals composition,and the number of laminae are the main factors affecting the enrichment and high yield of shale oil.

关 键 词：歧口凹陷 页岩油 纹层状页岩 层状泥页岩 富集因素 

分 类 号：TE132.1[石油与天然气工程—油气勘探]