摘要
鄂尔多斯盆地为北方典型的含油气盆地,发育的多套石炭-二叠系海陆交互相页岩层系为油气藏的形成提供了重要的源岩-储层。为定性评价地区上古生界页岩的储层特点,探讨高应力环境下页岩的吸附特征,研究测定了页岩岩心样品的TOC、Ro、矿物成分、孔隙类型及含气量等参数,并结合MATLAB三维成图方法探讨了储层物性的影响因素,分析了样品等温吸附特征,最后对吸附数据进行了参数拟合。结果发现,研究区页岩主要发育的孔隙类型为有机质孔和矿物质孔,粒间微裂隙也有一定发育,各类孔隙发挥的作用各不相同,共同组成了具有典型特征的孔-裂隙系统;样品页岩气含量以解吸气为主,且TOC对解吸气含量存在积极影响;D-R+K模型可以很好地表征甲烷气体在超临界条件下充填在微孔中的过程,样品的吸附特点具体表现为低压条件下的单层吸附和高压条件下的多层吸附和顺序充填。
Ordos basin is one of the most important petroliferous basin in northern China, where multiple sets of shale sequences of Carboniferous-Permian are well developed, which composed the significant source rock and res-ervoir for the formation of oil and gas. Testing total organic carbon,,mineral content,porosity and gas content, utilizing three-demensional map of MATLAB to discuss influencing factors and adsorption isotherm characteristics, furthermore, fit the adsorption data, in order to evaluate reservoir and adsorption characteristics of upper paleozoic shale in Erdos basin qualitatively. The results showed that the main pore types are organic pores and mineral pores in research area, moreover, particle microcracks can be developed partly, and all categories of pores composed the typical pore-fractures system of shale gas reservoirs. The gas contentsare make up of desorbed gas mostly and the desorbed gas content showed a negative correlation with total organic carbon. The D-R ＋ K model can be well re-flect thefilling process in micropores of methane, specifically, adsorption process mainly contained monolayer ad-sorption under low pressure and multilayer adsorption and sequential filling.
出处
《科学技术与工程》
北大核心
2017年第15期26-32,共7页
Science Technology and Engineering
基金
江苏省自然科学基金(青年基金)(BK20150179)
中央高校基本科研业务费专项资金(2015XKZD07)
江苏高校优势学科建设工程项目(PAPD)资助
