CAJ | 학술논문

针对火山岩储层成岩机制与常规沉积储层差异大、岩性种类繁多、储层孔隙结构复杂等特点，综合使用离心实验、核磁共振、恒速压汞及CT成像等实验技术，对大庆徐深、吉林长岭和新疆滴西3个火山岩气田可动流体百分数及其影响因素进行了对比研究。实验结果表明，气水离心标定低渗致密火山岩气藏可动流体百分数使用的离心力应为2.76 MPa，不同渗透率级别火山岩储层可动流体微观分布规律具有明显差异，渗透率越大，较大喉道控制的可动流体比例越大，气藏开发难度越小，渗透率越小，较大喉道控制可动流体比例越小，0.100 mD是可动流体微观分布规律发生明显变化的临界渗透率。108块岩芯可动流体百分数平均值为23.62%，长岭气田可动流体百分数最大，滴西气田可动流体百分数最小。CT成像与恒速压汞实验结果表明，孔喉大小及其匹配关系和裂缝发育程度是影响火山岩储层可动流体百分数大小的主要因素。
침대화산암저층성암궤제여상규침적저층차이대、암성충류번다、저층공극결구복잡등특점，종합사용리심실험、핵자공진、항속압홍급CT성상등실험기술，대대경서심、길림장령화신강적서3개화산암기전가동류체백분수급기영향인소진행료대비연구。실험결과표명，기수리심표정저삼치밀화산암기장가동류체백분수사용적리심력응위2.76 MPa，불동삼투솔급별화산암저층가동류체미관분포규률구유명현차이，삼투솔월대，교대후도공제적가동류체비례월대，기장개발난도월소，삼투솔월소，교대후도공제가동류체비례월소，0.100 mD시가동류체미관분포규률발생명현변화적림계삼투솔。108괴암심가동류체백분수평균치위23.62%，장령기전가동류체백분수최대，적서기전가동류체백분수최소。CT성상여항속압홍실험결과표명，공후대소급기필배관계화렬봉발육정도시영향화산암저층가동류체백분수대소적주요인소。
In view of the factors that the diagenetic mechanism of volcanic reservoir is different from the conventional deposi-tional sandstone reservoir,the micro-pore structure of the volcanic is more complex than that of sandstone reservoir. The mov-able fluid saturation of Xushen,Changling and Dixi volcanic gas reservoirs were systematically studied by using the centrifugal experiment,NMR,constant-rate mercury injection and CT technology. The experimental results indicate that the suitable cen-trifugal force used to obtaining the irreducible water saturation in centrifugal experiment is 2.76 MPa. The micro-distribution feature of the movable fluid corresponding to different permeability reservoir is different. The larger the permeability,the greater the proportion of the movable fluid controlled by the larger throat. 0.100 mD is one of the critical permeability values when the reservoir permeability larger or less than it,the micro-distribution feature of the movable fluid is different. The av-erage of the movable fluid saturation of the three gas reservoir is 23.62%. The CT image and constant-rate mercury injection experimental results suggested that the reservoir fracture and pore-to-throat ratio are the main factors affecting the movable fluid saturation.