收稿日期: 2017-01-14
修回日期: 2017-04-26
网络出版日期: 2017-06-10
基金资助
国家科技重大专项项目“致密气富集规律、资源潜力评价与有利目标优选”(编号:2016ZX05047-001);中国石油天然气股份有限公司重大科技专项项目“大庆油气持续有效发展关键技术研究与应用”(编号:2016E-02-03)联合资助.
Characterization of microscopic pore structure of tight sandstone reservoirs through nitrogen adsorption experiment: Case study of Shahezi Formation in Xujiaweizi Fault Depression,Songliao Basin,China
Received date: 2017-01-14
Revised date: 2017-04-26
Online published: 2017-06-10
微观孔隙结构研究对于徐家围子断陷沙河子组致密砂岩储层分类评价具有非常重要的意义,通过氮气吸附实验,针对其致密砂岩储层的微观孔隙结构开展研究,并分析了其影响因素。结果表明:沙河子组致密砂岩储层孔隙结构根据吸附回线形态可分为3类,第1类与 IUPAC的H2类相似,第2类与 IUPAC的H3类相似,第3类与 IUPAC的H4类相似。微孔(<10nm)与过渡孔(10~50nm)是比表面积和孔体积的主要贡献者,是沙河子组致密砂岩气聚集的主要空间。根据孔径分布形态,将沙河子组致密砂岩孔径划分为双峰型和三峰型2种类型,孔径主峰在30~60nm范围内,次峰在7~10nm和 100~110nm范围内。沙河子组微观孔隙主要有粒间孔、粒内孔、晶间孔等。沉积环境对孔隙结构的影响与不同沉积环境的岩性、岩石结构存在差异有关,矿物成分对储层微观孔隙结构有较大影响,其中比表面积、总孔孔体积与黏土含量呈正相关,与石英含量呈负相关,而平均孔径与黏土含量呈负相关,与石英含量呈正相关。
张大智 . 利用氮气吸附实验分析致密砂岩储层微观孔隙结构特征——以松辽盆地徐家围子断陷沙河子组为例[J]. 天然气地球科学, 2017 , 28(6) : 898 -908 . DOI: 10.11764/j.issn.1672-1926.2017.05.004
The study of microscopic pore structure is of very important significance to the classified evaluation of tight sandstone reservoirs of Shahezi Formation in Xujiaweizi Fault Depression,Songliao Basin.By use of nitrogen adsorption experiment,microscopic pore structure of tight sandstone reservoirs was studied.A discussion about controlling factors of microscopic pore structure development was made.The results show that microscopic pore structure of tight sandstone reservoirs of Shahezi Formation can be subdivided into three types according to the conformation of nitrogen adsorption-desorption curves.The first type is similar to H2 of ICPAC,the second type is similar to H3 of ICPAC and the third type is similar to H4 of ICPAC.The micro-pore(<10nm)and the transition pore(10-50nm)provide the dominant specific surface and pore volume and are the major space of tight sandstone gas accumulation of Shahezi Formation.The pore diameter of tight sandstone of Shahezi Formation can be subdivided into the bimodal distribution types and the three peak distribution types.The main peak is in a range of 30-60nm and the secondary peak is in a range of 7-10nm and 100-110nm.There are various types of micropores in the Shahezi Formation,including intergranular pore,innergranular pore and intercrystal pore.The influence of sedimentary environment to the pore structure is related with the difference of lithology and rock texture of different sedimentary environment.Mineralogical composition has a big effect on microscopic pore structure.Specific surface and total pore volume show a positive correlation with the clay contents and a negative correlation with the quartz contents.However,average pore diameter shows a negative correlation with the clay contents and a positive correlation with the quartz contents.
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