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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。
Aiming at the characteristics that the diagenesis mechanism of volcanic reservoir is different from conventional sedimentary reservoirs, the lithology variety is complex and the pore structure of reservoirs is complex and so on, the experiment of centrifugal test, nuclear magnetic resonance, , Changling, Jilin Province, and the three volcanic gas fields in Xixi, Xinjiang, and their influencing factors were compared. The experimental results show that the centrifugal force used to calibrate the percentage of mobile fluid in low permeability dense volcanic gas reservoirs should be 2.76 MPa, and the microscopic distribution of movable fluid in volcanic reservoirs with different permeability levels has obvious differences. The larger the permeability, the larger The greater the proportion of throat-controlled mobile fluid, the less the gas reservoir development difficulty and the smaller the permeability, the smaller the proportion of the throat-controlled movable fluid. The 0.100 mD is the critical permeability that the microscopic distribution of the movable fluid changes obviously rate. The average percentage of mobile fluid in 108 cores is 23.62%, the percentage of movable fluid in Changling gas field is the highest, and the percentage of movable fluid in the drop field is the lowest. CT imaging and constant pressure mercury injection results show that pore throat size and its matching relationship and the extent of fracture development is the main factor that affects the percentage of the movable fluid in the volcanic reservoir.