摘要
在侏罗系油气藏地区划分和对大量分析资料(约8000有效孔隙度和粒间渗透率样品)分析的基础上,阐明了侏罗系粒状储集层的渗容特征,并查明了它们随埋藏深度而变化的规律。指出,侏罗系油藏储集层总的特点是具有中、低孔隙度和较低、低的渗透率。在区域性的油气藏中,牛津阶和巴统阶具有最大的渗容值,而阿林巴依奥斯阶和托阿尔阶的渗容值较低,普林斯巴赫和赫唐- 辛涅缪尔阶渗容值最低,而生产层Ю11- Ю14、Ю2、Ю3 层的特点是中等孔隙度和中等、较低的渗透率。油气藏储集层的渗容值取决于储集层的埋深,上侏罗统砂具有中等有效孔隙度和粒间渗透率,孔隙度由14.2%降至 11.2%,粒间渗透率由 19.62×10-3μm2,降至 236×10-3μm2,而下侏罗统在2750—3750m,有效孔隙由 14.8%降至7%,粒间渗透率由7.90×10-3μm2 降至 0.03×10-3μm2,4250m以下,侏罗系粒状储集层的分布空间有限,其含油气远景可能与欠压实次生作用和裂隙型储集层的发育带有关。随着储集层埋深的加大,渗容值降低,这主要与上覆地层压力作用下的压实作用有关。
The regional classification of Jurassic reservoirs and a great deal of data about porosity and permeability of 8000 samples are analyzed. It is pointed out that the Jurassic reservoirs are generally characterized by moderate-low porosity and lower permeability, where the Oxfordian and Bathonian stages are of the maximum values, while the Alinbayios and Toar stages the relatively low, and the Plinsbahe and Hettangian-Xinemuer stages the minimum. The pay zones Ю1^1-Ю1^4、Ю2、Ю3 are moderate in porosity and moderate-lower in permeability. How well the poroperm characteristics of these reservoirs depend upon the buried depths of them. The Upper Jurassic sands are moderate in effective porosity ranging from 14.2% to 11.2% and intergranular permeability from 19.62×10^-3μm^2 to 2.36×10^-3μm^2 ; the Lower Jurassic sands （in depth of 2 750-3 750 m） range from 14.8% to 7% and from 7.90×10^-3μm^2 to 0.03×10^-3μm^2, below depth of 4 250 m the granular reservoirs of Jurassic are in limited distribution, their petroleum potentials are possibly related to secondary undercompaction and fractured reservoirs development. It is concluded that the values of poroperm characteristics of Jurassic reservoirs in northern West Siberian province are decreased with the buried depth due to different compactions of the overburden pressures.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2006年第1期127-133,共7页
Xinjiang Petroleum Geology
关键词
油气藏
储集层
渗容特征
有效孔隙度
粒间渗透率
oil-gas pool
reservoir rock
poroperm characteristics
effective porosity
intergranular permeability
