鄂尔多斯盆地丰富川姚251区长6储层特征研究

Characteristics of the Chang 6 Reservoir of the Fengfuchuan-Yao251 Area in Ordos Basin

以储层沉积为基础,结合岩石学多种分析测试资料,分析了鄂尔多斯盆地丰富川姚251区长6储层物性特征及影响因素。鄂尔多斯盆地丰富川姚251区长6主要为三角洲前缘沉积,其中水下分流河道是主要的油气储集层。储集层岩石类型以岩屑长石细砂岩为主,颗粒间多为线、点-线接触,孔隙-薄膜式胶结,具有成分成熟度低、结构成熟度高的特征。粒间孔和溶孔是主要的储集空间,其中以小孔和微孔为主,渗透率平均0.54×10^(-3)μm^2,为特低渗储层。结论:较强的压实作用、胶结作用是储层形成低孔低渗的主要因素,而溶蚀作用对储层物性有良好的改善作用。

Based on the reservoir sediment,the article uses a variety of analytical data on petrology to analyze the reservoir characteristics and influence factors as well.Delta front sediments are the main deposits in the Chang 6 Reservior of Yanchang Formation in Fengfuchuan Area of the Ordos Basin and subaquatic distributary channels are main reservoirs for the hydrocarbon.Fine arkose sandstone is main rock type of the Chang 6 Reservoir.They have line and point-line contact forms with pore and thin film cementation between rock grains.The Chang 6 reservoir is characterized by the low component maturity and high textural maturity;the main pore types are granular pore and secondary feldspar-dissolution pore which are mainly composed of small hole and micro-pore,Chang 6 Reservoir has ultra low permeability with the permeability of less than 0.54×10^(-3)μm^2;The strong compaction and cementation are the main factors which cause the low porosity and low permeability of the reservoir,while dissolution play the role of improving the physical property of the reservoir.