中国石油大学学报（自然科学版）
中國石油大學學報（自然科學版）
중국석유대학학보（자연과학판）
Journal of China University of Petroleum (Edition of Natural Science)
2015年
5期
58-64
,共7页
王晓波%陈践发%李剑%李志生%王东良%柳广弟%谢增业%刘锐娥%孙明亮%王义凤
王曉波%陳踐髮%李劍%李誌生%王東良%柳廣弟%謝增業%劉銳娥%孫明亮%王義鳳
왕효파%진천발%리검%리지생%왕동량%류엄제%사증업%류예아%손명량%왕의봉
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
緻密砂巖氣藏%擴散運移模擬實驗%濃度梯度%定量評價%成藏機製
치밀사암기장%확산운이모의실험%농도제도%정량평개%성장궤제
tight sandstone gas reservoirs%simulation experiment of gas diffusion%concentration gradient%quantitative evalu-ation%forming mechanism
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。
根據氣體在濃度梯度作用下進行自由擴散的原理，開展濃度梯度驅動下的天然氣擴散運移物理模擬實驗，對擴散在低孔滲緻密砂巖氣成藏中的作用和貢獻、低孔滲緻密儲層天然氣成藏機製進行探討。結果錶明：濃度梯度驅動下的天然氣擴散運移模擬實驗後低孔滲緻密砂巖最大含氣飽和度與物性總體呈負相關關繫，滲透率≤0.1×10-3μm2時最大含氣飽和度與孔隙度具有更好的負線性相關性，滲透率>0.1×10-3μm2時最大含氣飽和度與滲透率具有更好的負線性相關性；噹低孔滲緻密砂巖的孔隙度小于0.6%、空氣滲透率小于0.01×10-3μm2時，擴散可能對低孔滲緻密砂巖含氣飽和度的增加起主要作用和貢獻；擴散是低孔滲緻密儲層天然氣成藏的重要機製之一，是中低豐度低孔滲緻密儲層大麵積含氣的重要原因之一。
근거기체재농도제도작용하진행자유확산적원리，개전농도제도구동하적천연기확산운이물리모의실험，대확산재저공삼치밀사암기성장중적작용화공헌、저공삼치밀저층천연기성장궤제진행탐토。결과표명：농도제도구동하적천연기확산운이모의실험후저공삼치밀사암최대함기포화도여물성총체정부상관관계，삼투솔≤0.1×10-3μm2시최대함기포화도여공극도구유경호적부선성상관성，삼투솔>0.1×10-3μm2시최대함기포화도여삼투솔구유경호적부선성상관성；당저공삼치밀사암적공극도소우0.6%、공기삼투솔소우0.01×10-3μm2시，확산가능대저공삼치밀사암함기포화도적증가기주요작용화공헌；확산시저공삼치밀저층천연기성장적중요궤제지일，시중저봉도저공삼치밀저층대면적함기적중요원인지일。
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 po-rosity-permeability tight sandstone gas reservoirs, as well as forming mechanisms of low porosity-permeability tight gas res-ervoirs were discussed. The results show that the maximum gas saturation in the simulations has overall negative linear cor-relation 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.
