摘要
为研究西昌盆地B1井龙马溪组页岩储集空间发育特征,结合氩离子抛光和高分辨率扫描电镜观察技术对样品储集空间发育特征进行研究,并确定其发育类型,通过氩气(Ar)吸附—脱附测试测量样品的孔隙结构参数,实现了1~300 nm范围内的储集空间定量表征。结果表明:西昌盆地B1井龙马溪组页岩微观孔以有机质孔为主,部分为粒间孔、粒内孔。氩气(Ar)吸附等温曲线“滞后环”形态显示,孔隙形态以墨水瓶状为主,部分为狭缝状,孔隙直径分布呈“双峰”特征,孔隙直径分布差异较大,呈现较强非均质性。总有机碳含量和脆性矿物含量对样品中微纳米级储集空间的发育起主要控制作用,两者与孔隙的比表面积及比孔容等孔隙结构特征参数均呈正相关性;分形维数随着总有机碳含量和脆性矿物含量的增加而增大,孔隙结构愈加复杂,有利于页岩储层吸附能力的增强。该成果对研究西昌盆地龙马溪组页岩储集空间结构特征具有重要意义。
In order to study the spatial development characteristics of shale reservoir in Longmaxi Formation of Well B1 in Xichang Basin,high resolution scanning electron microscopy and argon adsorption-desorption experiment were used. Among them,the high-resolution scanning electron microscope test is mainly used to qualitatively describe the pore morphology of shale under microscope,and low temperature argon adsorption experiment can realize the quantitative characterization of reservoir space in the range of 1-300 nm. The results show that the shale reservoir of Longmaxi Formation in Well B1 in the study area mainly develops organic matter pores,intergranular pores and intragranular pores,and mainly organic matter pores. From the shape of argon adsorption isotherm,it can be seen that the pores are mainly ink bottle shaped,some are slit shaped,the pore diameter is“bimodal”,and the pore distribution is highly heterogeneous. Total organic carbon content and brittle mineral content play a positive role in protecting the development of reservoir space in the sample and controlling the development of micro and nano pores. They are positively correlated with pore structure characteristic parameters such as specific surface area and specific pore volume. With the increase of TOC content and brittle mineral content,the fractal dimension of the sample increases and the pore structure tends to be complex,which is conducive to the enhancement of the adsorption capacity of shale reservoir. The research results are of great significance to the research on the spatial structure characteristics of shale reservoir of Longmaxi Formation in Xichang Basin.
作者
黄毅
戚明辉
牟必鑫
曹茜
刘虎
郑见超
HUANG Yi;QI Minghui;MOU Bixin;CAO Qian;LIU Hu;ZHENG Jianchao(Sichuan Keyuan Testing Center of Engineering Technology,Chengdu 610091,China;Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province,Chengdu 610091,China;Technology Innovation Center of Shale Gas Exploration and Development in Complex Structural Areas,MNR,Chengdu 610091,China;Sichuan Institute of Coal Field Geological Engineering Exploration and Designing,Chengdu 610091,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第10期1691-1701,共11页
Natural Gas Geoscience
基金
四川省页岩气资源调查评价项目“西昌盆地页岩气资源调查评价和区块优选”(编号:DK-2017-F-008)
四川省自然科学基金“四川盆地南部地区龙潭组煤系储层特征及沉积控制机理研究”(编号:2022NSFSC1079)联合资助.
关键词
氩气吸附实验
孔隙结构特征
龙马溪组页岩
西昌盆地
Argon adsorption experiment
Pore characteristics
Shale of Longma Formation
Xichang Basin
作者简介
黄毅(1988-),男,四川南充人,工程师,硕士,主要从事非常规油气储层评价研究及地质实验测试工作.E-mail:416957644@qq.com.
