压差作用下火山岩干气藏供排气机理实验  

EXPERIMENTAL RESEARCHES ON THE MECHANISM OF GAS SUPPLY AND DISCHARGE IN VOLCANIC ROCK DRY-GAS RESERVOIR AT PRESSURE DIFFERENTIAL

作　　者：晏军[1,2] 杨正明[2] 刘超[1,2] 张亚蒲[2] 齐亚东[1,2] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《大庆石油地质与开发》2011年第2期36-40,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家油气重大专项（2008ZX05061-001）和国家自然基金项目（10672187）资助.

摘　　要：火山岩储层有不同于碎屑岩储层的孔渗结构，储集空间中主基岩占97％、裂缝占3％，孔隙是主要的储集空间。为此，设计了火山岩气藏裂缝岩心和基质岩心的并联和串联实验，分别模拟基岩与裂缝在平面和纵向上的组合关系。通过分析气体流速、岩心渗透率及驱替压力的关系，研究了压差作用下火山岩气藏的供排气机理。实验结果证明，裂缝是相对于基质的优势通道，裂缝的供排气能力远大于基质的供排气能力；增大压力梯度或渗透率都能提高裂缝和基质的供排气能力；基质和裂缝的渗透率级差越小，基质相对于整个系统的供排气能力越强；在火山岩气藏的开发生产过程中尽量做到在裂缝发育的层段射孔并加大生产压差；在平面上基质与裂缝的位置对整个系统的供排气能力影响不大；基质的渗透率决定着裂缝和基质组成串联系统的供排气能力，增大基质的渗透率对增强整个系统的供排气能力效果非常显著。There are different porosity and permeability structures in volcanic reservoir from classic rock reservoir. In its storage space, the main base rock occupies 97% ; the fractures account for 3% only, the pores are the principal storage space. Therefore, the series and parallel experiments of both fracture core and matrix core of volcanic gas reservoir are designed to respectively simulate the horizontal and vertical assemblage relations between the matrix and fractures. Through analyzing the relations among gas flow rate, core permeability and driving pressure, the mechanisms of gas supply and discharge in volcanic gas reservoir is researched. The experiments show that, the fractures are the superiority channel comparing with the matrix, the gas supply and discharge capacities of the fractures are more favorite than those of the matrix; the above capacities can be enhanced whenever raising pressure gradient or permeability; the smaller the permeability differential of both matrix and fracture, the greater the above capacities of the matrix over the whole system ; In the course of the development and production of volcanic gas res- ervoir, the perforation should be tried best to do in well-fractured interval, thus the production pressure differential ean be enhanced ; in vertical, the influences of the locations of both matrix and fractures on the capacities of wholesystem gas supply and discharge are not so serious; the capacities of the serious system made up by fracture and matrix are determined by matrix permeability, the increase of the matrix permeability can obviously improve the capacities of the whole system.

关 键 词：火山岩 气藏 压差作用 供排气 机理研究 孔缝组合 

分 类 号：TE311[石油与天然气工程—油气田开发工程]