摘要
通过对鄂尔多斯盆地延X井山西组、石盒子组沉积特征、岩石学特征、储层物性、孔隙结构等进行研究,分析影响储层物性的因素,与研究区其他天然气探井资料进行对比,并结合鄂尔多斯盆地区域沉积演化背景进行综合分析,认为储层总体以低孔低渗为特征,山西组物性最好,石盒子组次之;孔隙结构类型有粒间孔、粒间溶孔、长石溶孔、岩屑溶孔、沸石溶孔和晶间孔;上古生界碎屑岩储层主要分为4类,Ⅰ类和Ⅱ类储层主要分布在山西组和石盒子组,Ⅲ类和Ⅳ类较差的储层主要分布在石盒子组;影响储层物性的主要因素包括成岩作用和构造作用,构造破裂产生的微裂缝亦对储层起到一定的改善作用。
Based on the study of sedimentary features,lithologic characteristics,reservoir quality and pore structure of Shanxi and Lower Shihezi Formation,it analyzes the factors affecting reservoir.Compared with other gas wells,and in combination with regional sedimentary evolvement of Ordos Basin,it is considered that Shanxi Formation mainly develops meandering river delta and Lower Shihezi Formation mainly develops braided river sedimentary system.The front delta underwater distributary channel sandbodies of Shanxi and Lower Shihezi Formation are the main reservoirs for Neopaleozoic natural gas.Reservoir is totally characterized by low porosity and low permeability,Shanxi Formation is best,Shihezi Formation follows.Pore structural type includes intergranular pore,intergranular dissolved pore,feldspar dissolved pore,clastic debris dissolved pore,zeolite dissolved pore and intercrystal pore.Neopaleozoic clastic reservoir can be divided into 4 types,type I and II reservoirs mainly develop in Shanxi and Shihezi Formation while type Ⅲ and Ⅳ reservoirs mainly develops in Shihezi Formation.The main factors affecting reservoir features are diagenesis and tectonization.Microfracture appearing owning to tectonic disruption can improve reservoir somewhat.
出处
《长江大学学报（自然科学版）》
CAS
2011年第12期33-35,12,共3页
Journal of Yangtze University(Natural Science Edition)
