摘要
苏里格气田东区下石盒子组含水较高,流体赋存特征对致密砂岩气藏开采影响较大。通过岩矿鉴定、孔隙率以及渗透率分析等实验,结合核磁-离心技术,分析了孔隙率、渗透率、岩性、孔喉非均质性与连通性及其对流体赋存规律的影响。结果表明:①研究区致密砂岩储层孔隙的流动能力较差,束缚水饱和度较高,其流动能力与气体流动压差(离心力)密切相关。②填隙物对流动能力有关键的控制作用,丰富的高岭石含量代表着储层具有较好的连通性、较大的孔径,整体孔隙水流动能力较强;伊利石持水能力很强,容易造成毛管阻碍、限制流动能力。③气体流动压差(离心力)与储层孔隙水可流动的孔径具有较好的幂关系。④苏里格气田东区下石盒子组有效储集空间临界孔喉半径为0.089μm,可动水饱和度为23.95%。
The Lower Shihezi Formation in the eastern part of Sulige gas field has high water content,where the exploitation of tight sandstone gas reservoir is considerably affected by the characteristics of fluid occurrence.Specifically,this study analyzed the porosity,permeability,lithology,pore throat heter-ogeneity and connectivity and their effects on fluid occurrenceby rock and ore identification,porosity and permeability analysis and NMR centrifugation.Results show that:①the tight sandstone reservoir in the study area shows poor pore flow capacity,and bound water saturation.The flow capacity is closely related to the gas flow pressure difference(centrifugal force).②Intercalations play a key role in con-trolling flow capacity.Abundant kaolinite content indicates that the reservoir has better connectivity,lar-ger pore size and stronger overall pore water flow capacity.Illite has a strong water-holding capacity,which could easily cause capillary obstruction and limited flow capacity.③The gas flow pressure differ-ence(centrifugal force)is exponentially related to the pore diameter of reservoir pore water flow.④The critical pore throat radius of the effective reservoir space is 0.089μm,and the mobile water saturation is 23.95%in Xiashihezi Formation in the eastern part of Sulige gas field.
作者
张瀚澎
任大忠
张荣军
屈乐
李天
李启晖
Zhang Hanpeng;Ren Dazhong;Zhang Rongjun;Qu Le;Li Tian;Li Qihui(Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs,Xi’an Shiyou University,Xi’an Shaanxi 710065,China;Xi’an Key Laboratory of Tight Oil(Shale Oil)Development,Xi’an Shiyou University,Xi’an Shaanxi 710065,China)
出处
《矿业科学学报》
CSCD
2023年第6期744-757,共14页
Journal of Mining Science and Technology
基金
陕西省创新能力计划(2022PT-08)
陕西省教育厅青年创新团队科研计划(22JP063)
国家自然科学基金(52004223,51934005)。
关键词
致密砂岩气藏
核磁共振
渗吸
孔隙流体分布
tight sandstone gas reservoir
nuclear magnetic resonance
infiltration absorption
the movable fluid
pore fluid distribution
