广安气田须四段低渗砂岩气藏渗流机理研究  

Study on Mechanism of Low Permeability Sandstone Gas Reservoir in Fourth Member of Xujiahe in Guang An Gas Field

作　　者：李辉[1] 王燕[2] 欧剑 许涛 汪娟[5] 

机构地区：[1]长安大学地球科学与资源学院,西安710064 [2]成都理工大学材料与化学化工学院,成都610051 [3]四川省成都市华阳镇华阳大道四段30号输气管理处,成都610213 [4]中石化华北石油局工程技术研究院,郑州450006 [5]川庆钻探工程有限公司地质勘探开发研究院,成都610051

出　　处：《科学技术与工程》2013年第7期1946-1951,共6页Science Technology and Engineering

基　　金：教育部中央高校基金(CHD2012JC068)资助

摘　　要：在对储层特征进行详细分析的基础上,从毛管压力、储层结构特征、两相渗流特征、气体单相低速渗流特征和水锁、油锁损害等方面,深入研究了广安气田须四段低渗砂岩气藏渗流机理。研究结表明:须四段低渗砂岩气藏孔隙度集中在3%～7%之间,渗透率集中在0.001×10-3μm2～16.2×10-3μm2之间,属典型的低孔、低渗气藏。毛管压力曲线具有双峰态特征,属于中等偏差储层,孔喉中值半径0.1μm可作为划分储层与非储层的界限。低渗储层气水共存时,气体渗流受到滑脱效应和毛管力影响,低速渗流阶段,毛管力影响较为明显,使气体渗流产生低速非达西渗流现象。由于储层初始含水饱和度较高,随着部分可动水能够采出,水锁损害将得到改善,但凝析油析出量的增加,在喉道处易形成的"贾敏效应",增大气相渗流阻力,影响气井产能,造成油锁损害。voir structure lock, oil lock On the basis of a detailed analysis of the reservoir characteristics, from the capillary pressure, reser- characteristics, percolation characteristics of the two-phase, gas single -phase low-speed and water damage, etc. develop detailed study on the mechanism of low permeability sandstone gas reservoir in Fourth Member of Xujiahe in Guangan Gas Field seepage. Results show that ： low permeability sandstone gas reser- voir porosity is concentrated in the range of 3% to 7%, penetration concentrated between 0. 001 x 10-3 txm2 16. 2 x 10 -3 izm2, it belongs to a typical low porosity and low permeability gas reservoirs ; capillary pressure curve has a bimodal characteristics, it＇ s a moderate deviation reservoir, the pore throats value radius 0. 1 txm as a divi- sion of the reservoir and non- reservoir boundaries; coexistence of gas and water permeability reservoir , gas seep- age by the slippage effect and capillary forces affect the slow seepage stage , the capillary force of the impact is more obvious, and gas seepage produce low velocity non-Darcy flow phenomena. Reservoir initial water saturation , with movable water can be taken out , water blocking damage will be improved , but the increase in the amount of precipitation of condensate , easy to form at the throat ＂Jamin effect＂ increase the gas flow resistance , impact gas well production capacity , resulting in damage to the oil lock.

关 键 词：广安气田 砂岩 孔隙结构 渗流机理 

分 类 号：TE348[石油与天然气工程—油气田开发工程]