摘要
塔里木盆地阳霞凹陷侏罗系阿合组为大型辫状河三角洲沉积,辫状河道形成的厚层砂体在纵向上交错叠置,横向上交错连片,以低孔、低渗为特征的储集层在空间上大面积分布。野外及岩心观察、镜下鉴定以及成像测井均表明,阿合组砂岩裂缝十分发育,迪北气藏具有典型的裂缝性致密砂岩气藏特征。裂缝的发育对致密砂岩天然气的成藏具有十分重要的控制作用,主要表现为:降低起始充注压力,形成优势充注;形成网络充注通道,提高天然气充注效率;提高致密砂岩渗透率,增加含气饱和度;增加了孔隙空间,扩大了储量规模。
Ahe formation of Jurassic is a large braided river delta deposit in Yangxia sag in Tarim basin.The thick sand bodies of braided river channel occur in shape of longitudinal overlapping and lateral cross connecting,and the low-porosity and low-permeability reservoir is extensively distributed in this area.The field survey,core observation,microscopic identification and imaging logging show that the fractures in the Ahe sandstone are well-developed.Dibei gas reservoir in this sag has the characteristics of a typical fractured tight sandstone gas reservoir.The fracture development has very important controlling effect on such a gas accumulation,including reducing initial charging pressure,forming advantageous charging,shaping network charging channels,improving the efficiency of gas charging,enhancing tight sandstone permeabiltty,increasing gas saturation and pore space as well as enlarging the size of the reserves.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2014年第1期49-51,共3页
Xinjiang Petroleum Geology
关键词
塔里木盆地
阳霞凹陷
阿合组
裂缝型致密砂岩气藏
网络充注通道
优势充注
Tarim basin
Yangxia sag
Ahe formation
fractured tight sandstone gas reservoir
network charging channels
advantageous charging
