摘要
【研究目的】鄂尔多斯盆地延长组长7段页岩油气已经成为油气勘探热点和重点接替区,本文分析页岩油气有机质的非均质性特征及其对矿物组分、含气量、孔隙结构的影响,为页岩油气进一步开发提供基础数据。【研究方法】以鄂尔多斯盆地延安地区延长组长7段为例,综合利用岩心资料、测井资料、有机地球化学等实测数据,通过镜下薄片、扫描电镜、X-射线衍射、X-荧光衍射等实验手段,分析研究区泥页岩储层有机质的非均质性特征,并利用数学方法探明其与储层矿物组分、含气量和孔隙结构之间的关系。【研究结果】研究表明,该地区长7段具有较强的非均质性,且有机质与矿物组分、含气量、孔隙结构等有密切的关系。【结论】有机质在微观及宏观分布上具有强非均质性,其中长73亚段非均质性最强;总有机碳(TOC)含量与矿物组分、含气量、孔隙结构等参数之间有较强的相关性,矿物组分的含量会影响有机质分布的非均质性,而有机质的非均质性也会对泥页岩储层的含气量、孔隙结构等产生一定影响;长73亚段烃源岩厚度较大,TOC含量较高,生烃潜力大,具有较好的开发潜力。
[Objective]Shale oil and gas in the Chang 7 Member of the Yanchang Formation in the Ordos Basin have become a hot spot in oil and gas exploration and a key replacement area.This paper analyzes the heterogeneity characteristics of organic matter in shale oil and gas and its influence on mineral composition,gas content,and pore structure,aiming to provide basic data for the further development of shale oil and gas.[Methods]Taking the Chang 7 Member of the Yanchang Formation in Yan'an area of the Ordos Basin as an example,this study comprehensively uses measured data such as core data,logging data,and organic geochemistry,and adopts experimental methods including microscopic thin-section observation,scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray fluorescence diffraction(XRF)to analyze the heterogeneity characteristics of organic matter in the shale reservoirs in the study area.Mathematical methods are also used to clarify the relationships between organic matter and reservoir mineral composition,gas content,and pore structure.[Results]The study shows that the Chang 7 Member in this area has strong heterogeneity,and organic matter is closely related to mineral composition,gas content,and pore structure.[Conclusions]Organic matter exhibits strong heterogeneity in both microscopic and macroscopic distributions,with the strongest heterogeneity in the Chang 73 sub-member.The total organic carbon(TOC)content has a strong correlation with parameters such as mineral composition,gas content,and pore structure.The content of mineral components affects the heterogeneity of organic matter distribution,while the heterogeneity of organic matter also has a certain impact on the gas content and pore structure of shale reservoirs.The source rocks in the Chang 73 sub-member have a large thickness,high TOC content,and high hydrocarbon generation potential,indicating good development prospects.
作者
李慧
赵卫卫
王凤琴
孙建博
刘钰晨
王嘉楠
LI Hui;ZHAO Weiwei;WANG Fengqin;SUN Jianbo;LIU Yuchen;WANG Jianan(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China;Shaanxi Key Laboratory of Hydrocarbon Accumulation Geology,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co,Ltd.,Xi'an 710065,Shaanxi,China)
出处
《地质通报》
北大核心
2025年第8期1402-1415,共14页
Geological Bulletin of China
基金
国家重大专项《陆相页岩储气机理与储层精细描述研究》(编号:2017ZX05039-01-002)
西安石油大学创新立项《西安石油大学研究生创新与实践能力培养计划》(编号:YCS23114111)。
