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扩散在低孔渗致密砂岩气成藏中的作用和贡献探讨
王晓波1,2,3,陈践发1,李剑2,3,李志生2,3,王东良2,3,柳广弟1,谢增业2,3,刘锐娥2,3,孙明亮1,王义凤2,3
(1.中国石油大学油气资源与探测国家重点实验室,北京 102249;2.中国石油勘探开发研究院廊坊分院, 河北廊坊 065007;3.中国石油天然气集团公司天然气成藏与开发重点实验室,河北廊坊 065007)
摘要:
根据气体在浓度梯度作用下进行自由扩散的原理,开展浓度梯度驱动下的天然气扩散运移物理模拟实验,对扩散在低孔渗致密砂岩气成藏中的作用和贡献、低孔渗致密储层天然气成藏机制进行探讨。结果表明:浓度梯度驱动下的天然气扩散运移模拟实验后低孔渗致密砂岩最大含气饱和度与物性总体呈负相关关系,渗透率≤0.1×10-3μm2时最大含气饱和度与孔隙度具有更好的负线性相关性,渗透率>0.1×10-3μm2时最大含气饱和度与渗透率具有更好的负线性相关性;当低孔渗致密砂岩的孔隙度小于0.6%、空气渗透率小于0.01×10-3μm2时,扩散可能对低孔渗致密砂岩含气饱和度的增加起主要作用和贡献;扩散是低孔渗致密储层天然气成藏的重要机制之一,是中低丰度低孔渗致密储层大面积含气的重要原因之一。
关键词:  致密砂岩气藏  扩散运移模拟实验  浓度梯度  定量评价  成藏机制
DOI:10.3969/j.issn.1673-5005.2015.05.008
分类号::TE 122
基金项目:国家重大科技专项(2011ZX05007-002);国家“973”项目(2007CB209503);国家自然科学基金项目(41102086)
Discussion on role of gas diffusion and its contribution in low porosity-permeability tight sandstone gas reservoirs
WANG Xiaobo1,2,3, CHEN Jianfa1, LI Jian2,3, LI Zhisheng2,3, WANG Dongliang2,3, LIU Guangdi1, XIE Zengye2,3, LIU Ruie2,3, SUN Mingliang1, WANG Yifeng2,3
(1.State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum,Beijing 102249, China;2.Langfang Branch of PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China;3.The Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007, China)
Abstract:
Assuming that gas diffusion is controlled by its concentration gradient, the physical simulation experiments of gas difussion driven by concentration gradient were conducted, and the role of gas diffusion and its contribution in low porosity-permeability tight sandstone gas reservoirs, as well as forming mechanisms of low porosity-permeability tight gas reservoirs were discussed. The results show that the maximum gas saturation in the simulations has overall negative linear correlation with the gas physical properties:it correlates with the gas porosity when permeability is less than 0.1×10-3μm2; and correlates with the gas permeability when permeability is larger than 0.1×10-3μm2. Gas diffusion may become the main mechanism for gas saturation increment in low porosity-permeability tight sandstone reservoir, when porosity is less than 0.6% and permeability is less than 0.01×10-3μm2. Gas diffusion is one of the important forming mechanisms of low porosity-permeability tight gas reservoir, and one of the important reasons for low porosity-permeability tight reservoir with large gas bearing area.
Key words:  tight sandstone gas reservoirs  simulation experiment of gas diffusion  concentration gradient  quantitative evaluation  forming mechanism
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