摘要
兴隆台油层储层微观非均质性以上、下层系的成分与结构差异明显为特点 ,上层系岩石相组合以不含砾砂岩为主 ,主要为长石岩屑砂岩 ;下层系岩石相组合以含砾砂岩为主 ,主要为岩屑砂岩 ,较上层系分选性差、颗粒粗。宏观非均质性以储层砂体发育不均及物性变化大为特点。垂向上 ,上层系单砂层厚度小、砂层频率高、砂岩密度小 ;下层系单砂层厚度大、砂层频率低、砂岩密度大。平面上 ,上层系分东、西两个砂体 ,且东砂体相对发育 ,向上逐渐连为一体 ;下层系砂体分布开阔 ,但向上面积逐渐缩小 ,且东厚西薄。上层系的储层物性较下层系好。层间、层内及平面非均质性明显 ,且层间非均质性较层内非均质性强 ,层内非均质性自下而上逐渐增强。引起储层非均质性的主要原因是沉积环境和构造环境。
Xinglongtai oil reservoir is characterized, in terms of micro heterogeneity, by obvious distinctions on component and structure of rock between underlayer series and upper one. Rock assemblage in upperlayer series mostly consists of sandstones without gravel which are mainly feldspar rock-fragment ones, whereas rock assemblage in underlayer series is chiefly composed of sandstone with gravel which are mainly feldspar rock fragments. The sorting of sandstone grains is poorer in underlayer series than that in upper one. The particle size in underlayer series is thicker than that in upper one. Macro heterogeneity shows uneven growth of sand body and obvious variations of porosity and permeability.Vertically,the thickness of single sand body and the frequency of sand body as well as the density of sand rock are all smaller in upperlayer series than that in under one.Horizontally, the sand body in the upperlayer series is divided into two parts locating in the east and west which gradually join together upwards. The distribution of sand bodies in the underlayer series is wide. Whereas the distribuition area gradually decreases upwards. Inter-layer, internal and plane heterogeneity of porosity and permeability is obvious, moreover the inter-layer heterogeneity is intense than internal heterogeneity which gradually gather head from bottom to top.Primary reasons leading to reservoir heterogeneity are sedimentary environment and tectonism.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2002年第4期382-386,共5页
Oil & Gas Geology
基金
辽河油田科研项目"辽河油田曙一区杜 84块兴隆台油层超稠油藏地质研究"成果之一
