石油实验地质2024，Vol.46Issue(1)：11-21,11.DOI:10.11781/sysydz202401011
川中侏罗系自流井组大安寨段页岩油储层特征及其勘探启示
Shale oil reservoir characteristics and exploration implication in Da'anzhai Member of Jurassic Ziliujing Formation in central Sichuan Basin
摘要
Abstract
To further guide the exploration and development of shale oil in the Da'anzhai Member of the Jurassic Ziliujing Formation in the Sichuan Basin,it is urgent to clarify the favorable lithofacies of shale oil.In this study,core observation,thin section authentication,high pressure mercury injection,NMR,rock pyrolysis analysis and other experiments were used to analyze the reservoir space types,pore structure characteristics and oil-bearing properties of different lithofacies of shale series in the Da'anzhai Member.The results show that mainly six types of lithofacies are developed in the Da'anzhai Member:massive(argillaceous)shell limestone,layered argillaceous shell limestone,layered shell shale,laminar shell-bearing shale,massive shell-bearing clay shale and foliated siltstone-bearing clay shale.The physical properties of shale in the Da'anzhai Member are much better than those of shell limestone,and with the increase of calcareous content,the pore size of the shale gradually increases,but the total pore volume and total connected volume gradually decrease.The average free oil value(S1)of the shale series in the Da'anzhai Member is 1.31 mg/g,with moderate oil-bearing property.The S1 values of the foliated siltstone-bearing clay shale and the laminar shell-bearing shale are relatively higher,which are 2.37 mg/g and 1.82 mg/g,respectively.In summary,it is believed that the foliated siltstone-bearing clay shale and the laminar shell-bearing shale have good reservoir properties and high oil-bearing properties.The lithofacies combination of the two can be a key exploration target for shale oil in the Da'anzhai Member.关键词
储集空间/含油性/页岩油/储层特征/大安寨段/侏罗系/四川盆地Key words
reservoir space/oil-bearing property/shale oil/reservoir characteristics/Da'anzhai Member/Jurassic/Sichuan Basin分类
能源科技引用本文复制引用
洪海涛,路俊刚,秦春雨,张少敏,张芮,周易鑫,肖正录,周红飞,韩璐媛..川中侏罗系自流井组大安寨段页岩油储层特征及其勘探启示[J].石油实验地质,2024,46(1):11-21,11.基金项目
中国石油—西南石油大学创新联合体科技合作项目(2020CX050000)资助. （2020CX050000）
