特种油气藏2024，Vol.31Issue(4)：27-35,9.DOI:10.3969/j.issn.1006-6535.2024.04.004
陆东凹陷中低成熟度页岩油储层含油性特征及"甜点"评价
Oil-bearing Characteristics and"Sweet Spots"Evaluation of Medium-low Maturity Shale Oil Reservoirs in Ludong Sag
摘要
Abstract
To address the issues of unclear distribution characteristics and enrichment control factors of medium-low maturity shale oil reservoirs in the Jiaolige Sag,Ludong Depression,a study on the oil-bearing characteristics of shale oil reservoirs was conducted through methods such as 2D NMR analysis,nano-CT scanning,and identification of kerogen microscopic components.A comprehensive evaluation standard for identifying shale oil sweet spots was established based on factors such as shale lithofacies,reservoircapabilities,oil-bearing characteristics,andmobility.The results show that the degree of development,density,lithology,and other structural characteristics of shale lami-nation and bedding are the primary influencing factors on the oil-bearing characteristics and distribution.The lay-ered siltstone,composed of coarse grained clastics and laminated felsic shale,exhibits excellent pore microstructure and connectivity.The specific surface area is less than 15 m2/g,and the average pore size of nitrogen adsorption is greater than 8 nm,which is a highly favorable reservoir.The total organic carbon(TOC)content of class Ⅰ+Ⅱ"sweet spot"exceeds 1％,with the reservoir exhibiting medium and large pores accounting for over 25％.The pore size within the reservoir space is greater than 8 nm,indicating a medium to good oil bearing potential and mobility,leading to relatively enriched oil and gas.These findings offer valuable technical support for identifying favorable tar-gets for shale oil development in the study area,as well as for deploying and evaluating test areas.关键词
"甜点"评价/赋存特征/微观分布/中低成熟度/页岩油/交力格洼陷/陆东凹陷Key words
"sweet spot"evaluation/occurrence characteristics/microscopic distribution/medium-low maturity/shale oil/Jiaolige Sag/Ludong Sag分类
能源科技引用本文复制引用
周立国..陆东凹陷中低成熟度页岩油储层含油性特征及"甜点"评价[J].特种油气藏,2024,31(4):27-35,9.基金项目
中国石油天然气股份有限公司重大科技专项"辽河油田千万吨稳产关键技术研究与应用"(2017E-16) （2017E-16）
