含气页岩渗透率实验  

EXPERIMENT ON GAS-BEARING SHALE PERMEABILITY

作　　者：卓仁燕 张烈辉[1] 郭晶晶[1] 马俊修 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《大庆石油地质与开发》2016年第1期155-157,共3页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家杰出青年基金(51125019);国家自然基金青年科学基金项目(51404206)

摘　　要：采用压力脉冲衰减法测量了岩心柱的渗透率，讨论了内压和有效应力对渗透率的影响。同时，采用岩屑压力衰减法测量了页岩基质渗透率，并基于控制变量法优选出页岩基质渗透率实验参数。研究表明：在低内压的条件下，由于滑脱效应使渗透率增加；页岩渗透率随有效应力的升高呈非线性降低，孔隙压力越低，应力敏感性越强，有效应力在升高、降低过程中存在应力一应变滞后回线。岩屑压力衰减法测量基质渗透率实验的初始压力为1．3～1．38MPa，岩屑平均粒径为0．7～1mm，岩屑样品质量为25～30g。By means of pulsed-decay method, the perrneabilities of shale plugs are measured, the influences of the pore pressure and effective stress on the permeabilities are discussed. Meanwhile the shale matrix permeabihty is tested by crushed-rock pressure-decay method and furthermore according to variable controlling method, the experi- mental parameters of the matrix permeability are optimized. The achievements show that under the conditions of the internal pressure, because of the slippage effect, the permeabilities are enhanced; with the rise of the effective stress, the shale permeability reduces nonlinearly, the lower the pore pressure is, the stronger the stress sensitivity will be, in the course of the increase and reduction of the effective stress, there exits the hysteresis loop between the stress and strain. The initial pressure measured in the matrix permeability experiment by rock pressure-decay method is 1.3-1.38 MPa, the average particle size of the crushed rock is 0. 7-1 mm and the rock sample mass is 25-30 g.

关 键 词：页岩 渗透率 实验 内压 有效应力 岩屑渗透率 

分 类 号：TE311[石油与天然气工程—油气田开发工程]