徐深气田火山岩气藏水锁效应  

RESEARCH ON THE WATER LOCK EFFECT FOR THE VOLCANIC GAS RESERVOIRS IN XUSHEN GASFIELD

作　　者：尚尧[1] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《大庆石油地质与开发》2015年第3期53-56,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究发展计划"973"项目"火山岩油气藏的形成机制与分布规律"(2009CB219308);中国石油天然气股份公司重大科技专项"大庆探区非常规油气勘探开发关键技术研究与现场试验"(2012E-2603-01)

摘　　要：徐深气田火山岩气藏储层复杂,开发难度较大。为制定合理的气藏开发方案,提高单井产量和经济效益,减少开发过程对气藏的伤害,研究了不同孔隙类型火山岩气藏的全直径岩心水锁伤害机理。利用核磁共振T_2谱给出了不同孔隙类型储层自吸水和气相反排后滞留水分布规律,从微观角度解释了不同孔隙类型储层水锁伤害恢复快慢差别的原因。研究认为:火山岩气藏储层岩心含水饱和度随渗吸时间的延长而增加;储层大孔隙越发育则渗透率越高,微孔隙占比越大则渗透率越小;储层孔喉连通性越差,非均质性越强,则自发渗吸时岩心吸水量越小;连通性较差的大孔隙是残余气分布的主要孔隙空间;储层水锁伤害随气体反排孔隙体积倍数的增加而减小。The volcanic gas reservoirs of Xushen Gasfield are characterized by the complex development and difficult to develop.In order to draw up the reasonable reservoir developing program to increase the individual well production and economic effect and reduce the reservoir damage in the development process,the researches are carried out for the full-diameter-core＇ s water-lock damaging mechanism for different kinds of the pore types of the volcanic gas reservoirs.By means of NMR T2 spectra,the distributing laws of the spontaneous-imbibition water of different types of the pores of the reservoirs and retained water after the gas-phase reverse discharge are presented,and furthermore the reasons that causes the differences of the water lock damage recovery are explained from the viewpoint of the microscope.The researches show that the water saturation of the cores from the volcanic gas reservoirs rises with the imbibition time;the more well-developed the large pores are,the higher their permeabilities will be,the larger proportion the micro-pores take,the lower their permeabilities will be;the poorer the pore-throat connectivity in the gas reservoir is,there exists severe reservoir heterogeneity,the lower amount of water adsorption for the cores during the spontaneous-imbibition process will be;The large pores with rather poorer connectivity are the main storage spaces for the residual gas;the water lock damage reduces with the rise of the reverse-discharged pore volumes （PVs） of the gas.

关 键 词：徐深气田 火山岩气藏 储层岩相 溶蚀和改造 储层伤害 水锁效应 

分 类 号：TE122.3[石油与天然气工程—油气勘探]