摘要
为进一步指导四川盆地侏罗系自流井组大安寨段页岩油的勘探与开发,亟需理清页岩油的有利赋存岩相。通过岩心观察、薄片鉴定、高压压汞、核磁共振、岩石热解等实验,分析大安寨段页岩层系不同岩相的储集空间类型、孔隙结构特征及含油性。结果表明,大安寨段主要发育块状(泥质)介壳灰岩、层状泥质介壳灰岩、层状介壳页岩、纹层状含介壳页岩、块状含介壳黏土质页岩和页理状含粉砂黏土质页岩6类岩相;页岩物性远优于介壳灰岩,且随着灰质含量的增加孔径逐渐增大,但总孔体积和总连通体积逐渐减小;大安寨段页岩层系平均游离油(S1)值为1.31 mg/g,含油性中等,页理状含粉砂黏土质页岩与纹层状含介壳页岩S1值较高,分别为2.37 mg/g与1.82 mg/g。页理状含粉砂黏土质页岩和纹层状含介壳页岩的储集性较好、含油性较高,两者构成的岩相组合可作为大安寨段页岩油的重点勘探对象。
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(S 1)of the shale series in the Da’anzhai Member is 1.31 mg/g,with moderate oil-bearing property.The S 1 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.
作者
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
HONG Haitao;LU Jungang;QIN Chunyu;ZHANG Shaomin;ZHANG Rui;ZHOU Yixin;XIAO Zhenglu;ZHOU Hongfei;HAN Luyuan(Exploration and Development Research Institute,Southwest Oil&Gas Field Company,PetroChina,Chengdu,Sichuan 610051,China;National Key Laboratory of Petroleum Geology and Development Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Sichuan Provincial Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;School of Earth Science and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China)
出处
《石油实验地质》
CAS
CSCD
北大核心
2024年第1期11-21,共11页
Petroleum Geology & Experiment
基金
中国石油—西南石油大学创新联合体科技合作项目(2020CX050000)资助。
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
reservoir space
oil-bearing property
shale oil
reservoir characteristics
Da’anzhai Member
Jurassic
Sichuan Basin
