摘要
准噶尔盆地西北缘侏罗系主要发育一套河流 -湖泊沉积体系 ,沉积相对储层物性的控制作用是第一性的 ,沉积相变可以导致储集物性由储层向非渗透层的突变 ,成岩作用对储集物性的改造作用也很明显 ,但仅能造成在同一沉积相带内储集物性的明显差异 ,同沉积相对储层物性的控制作用相比是第二性的。沉积相通过控制储集岩的颗粒粒度及泥质含量来控制储集物性 ,而成岩作用对储集物性的控制则表现为随储层埋藏深度不同 ,储层所遭受的成岩作用类型和强度均存在明显的差异 ,从而导致储集物性具有垂向分带的特征。通过在输入参数组合中增加受沉积相控制的岩性参数 ,可以在很大程度上改善测井反演孔隙度的精度。通过沉积相分布图和构造图 ,可以综合沉积和成岩两大地质控制因素进行储层物性平面分布的预测 ,这比单一地质因素预测方法具有更高的精度。
A Jurassic fluvial lacustrine sedimentary system develops on the north west edge of Junggar Basin. Sedimentary facies is the most important factor controlling reservoir properties. It can lead to an abrupt change from reservoir rock to nonpermeable rock. Diagenesis is another key factor modifying reservoir properties, but its efficiency is secondary relatively to sedimentary facies for it can only cause obvious diversity in the same sedimentary facies. Sedimentary facies controls reservoir properties by influencing the grain size and shale content, while the control of diagenesis on reservoir properties shows vertical zonation characteristics of reservoir properties because the types and intensity of diagenesis change with the buried depth. Sedimentary and diagenesis factors can be combined to predict the distribution of reservoir properties by using a sedimentary facies map and tectonic map. This has higher accuracy compared with other predicting methods based on a single geological factor.
出处
《成都理工学院学报》
CSCD
北大核心
2002年第2期152-156,共5页
Journal of Chengdu University of Technology
