摘要
鄂尔多斯盆地奥陶纪时为稳定的克拉通内凹陷盆地.其马家沟组为一套古风化壳的岩溶地貌,蕴藏着丰富的天然气资源。靖边潜台南部马五_1时总体上为局限台地环境,主要岩石类型为泥-细粉晶白云岩及含硬石膏结核溶模孔白云岩.由于储集层储集类型为风化壳岩溶型,针对这一特点从微观和宏观两方面阐述了储集空间类型及特征,并对马五_1各小层之间的物性特征进行了分析比较.得出马五_1储层总体具有低孔低渗的特点。通过从沉积和储层两方面特征的研究揭示了影响储层储集性能的控制因素为岩性与沉积微相、古岩溶地貌和成岩作用。
Ordos basin was a stable kratogenic inner depressed ba- sin in the Ordovician period.Majiagou Formation in Ordos basin is a karst palaeogeomorphology,with abundant natural gas resources.Majiagou 51 sub-member belongs to re- stricted platform setting,its main rock types are mud-thin crystal powder dolomite and nodwlar anhydrite dolomite.In view of the reservoir as a weathering crust karst0 the micro- scopic and microcosmic types and the characteristics of reser- voir spaces are elaborated,and the physical properties of ho- rizons in Majiagou 51 sub-member are analyzed compara- bly.It is concluded that Majiagou 51 sub-member is char- acterized by low porosity and low permeability.The above studies on characteristics of sedimentation and reservoir sug- gest that the factors controlling reservoir's storage and pres- ervation ability are lithologyo sedimentary microfacies,karst palaeogeomorphology and diagenesis.
出处
《石油地质与工程》
CAS
2008年第5期41-43,共3页
Petroleum Geology and Engineering
关键词
鄂尔多斯盆地
马家沟组
古岩溶
碳酸盐岩
白云岩
储层
控制因素
Ordos basin
Majiagou Formation
palaeokarst
carbonate rock
dolomite
reservoir
controlling factor
