鄂尔多斯盆地神木地区侏罗系延安组煤层孔隙结构及可动流体饱和度影响因素

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中文摘要：为研究神木地区侏罗系延安组煤层可动流体饱和度影响因素,针对煤层孔隙小、油水渗流机理复杂及开发矛盾突出等问题,通过开展铸体薄片、X-衍射和扫描电镜等实验,分析煤层孔隙结构特征,利用核磁共振及高压压汞实验,对研究区可动流体赋存特征及其影响因素进行总结.研究结果表明:1)研究区煤层样品核磁孔隙度为0.389％～10.137％,渗透率为2.395～6.278 mD,可动流体饱和度为30.23％～66.31％;2)核磁共振T2谱分布图具有典型的双峰及单峰式特征,煤层孔隙以介孔为主,微孔次之,大孔最少;3)压汞结果显示样品排驱压力低,为0.041～1.502 MPa,平均值为0.716 MPa;最大进汞饱和度高,为13.06％～88.31％,平均值为65.59％;退汞效率为0.84％～47.28％,平均值为28.02％;4)可动流体饱和度主要受到储层物性、孔隙结构及矿物组分的影响.渗透率与可动流体饱和度呈较好的正相关关系,而孔隙度与其相关性较弱.喉道半径越大,连通性越好,可动流体饱和度越大.黏土矿物通过占据、堵塞孔隙使可动流体饱和度降低.以上成果认识,对预测煤层开发效果具有指导意义.

外文标题：Factors affecting movable fluid saturation and pore structures of Jurassic Yan'an Formation in the Shenmu area of the Ordos Basin

外文摘要：In order to study the factors affecting the movable fluid saturation in the Jurassic Yan'an Formation coal seams in Shenmu area,and to address issues such as small pores,complex oil-water flow mechanisms,and prominent development contradictions in coal seam,experiments such as casting thin sections,X-ray diffraction,and scanning electron microscopy were conducted to analyze pore structure characteristics in coal seam in this paper.The occurrence characteristics and affecting factors of movable fluids in the study area were analyzed using nuclear magnetic resonance and high-pressure mercury intrusion experiments.The results show that:1)The nuclear magnetic porosity of the coal seam samples in the study area ranges from 0.389％to 10.137％,the permeability ranges from 2.395 mD to 6.278 mD,and the saturation of movable fluids ranges from 30.23％to 66.31％;2)The T2 spectrum distribution of nuclear magnetic resonance exhibits typical bimodal and unimodal characteristics.The coal seam pores in thestuy area are mainly mesopores,followed by micropores,and macropores are the least;3)The mercury intrusion results show that the sample displacement pressure is low,ranging from 0.041 MPa to 1.502 MPa,with an average of 0.716 MPa;The maximum mercury saturation is high,ranging from 13.06％to 88.31％,with an average of 65.59％;The mercury removal efficiency ranges from 0.84％to 47.28％,with an average of 28.02％;4)The saturation of movable fluids is mainly influenced by reservoir physical properties,pore structure,and mineral components.There is a good positive correlation between permeability and saturation of movable fluids,while the correlation between porosity and saturation is relatively weak.The larger the throat radius,the better the connectivity and the greater the saturation of the movable fluid.Clay minerals reduce the saturation of movable fluids by occupying and blocking pores.The above achievements are significant guides for predicting the effects of seam development.

外文关键词：

Shenmu areapore structurenuclear magnetic resonancehigh-pressure mercury intrusionmovable fluidaffecting factor

作者：

阎珍、任大忠、王虎、孙振、万慈眩、李启晖、李天

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作者单位：

西安石油大学石油工程学院西部低渗-特低渗油藏开发与治理教育部工程研究中心,西安 710065

中国石油长庆油田分公司第六采气厂,西安 710018

关键词：

神木地区孔隙结构核磁共振高压压汞可动流体影响因素

基金：

陕西省重点研发计划基金项目陕西省油气田特种增产技术重点实验室开放基金国家自然科学基金西安石油大学研究生精品案例库项目

项目编号：

2021GY-14020JS120519340052023-X-YAL-004

出版年：

2024

DOI：

10.19901/j.fcgyq.2024.05.14

非常规油气

ISSN：

年,卷(期)：2024.11(5)