辫状河三角洲沉积体单井地质模型优选研究  

OPTIMIZATION OF SINGLE WELL GEOLOGICAL MODEL OF BRAIDED RIVER DELTAIC DEPOSIT BODY

作　　者：徐文[1] 王东旭[2] 何丽萍[2] 

机构地区：[1]西北大学地质学系 [2]中国石油长庆油田分公司勘探开发研究院

出　　处：《天然气工业》2005年第4期45-46,共2页Natural Gas Industry

摘　　要：鄂尔多斯盆地上古生界盒8段和山2段储层是受河流作用控制为主的辫状河三角洲沉积体系,河道侧向摆动频繁、迁移改道明显,河道间相互叠置交错普遍,传统的径向模型往往难以取得满意拟合效果。文章针对辫状河沉积体系砂体特征,结合储层沉积背景,辫状河心滩、分流河道和边滩等微相不同的空间展布形态,建立了包括充分大砂体多层非均质模型和透镜状砂体多层非均质模型在内的多个单井地质概念模型;结合单井数值模拟对生产动态资料进行拟合,修正了储层参数,得到了能够反映储层真实情况的精细地质模型,评价了单井控制范围、控制储量、分析储层非均质性,深化了地质认识。研究认为,考虑物性网状低渗带分布的透镜状砂体多层非均质模型更适合辫状河沉积储层的特点,通过多模型对比评价,在油气藏开发评价初期不失为一种行之有效的方法。The P1-2 s8 (the member of Shihezi Formation, Permian) and P1 s2 (the second member of Shanxi Formation, Lower Permian) reservoirs in E'erduosi Basin belong in the braided river deltaic deposit system mainly controlled by fluviation with frequent lateral sway, obvious channel change and commonly-existing channel superposition and interlacing, so that it was difficult to achieve a satisfactory simulation result by use of the conventional radial model. In light of the sandbody features of the braided river deltaic deposit system and in combination with the sedimentary environment of reservoirs, several single well geological concept models including the adequately-great sandbody multilayer heterogeneity model and the lenticular sandbody multilayer heterogeneity model were set up in consideration of the spatial distributions of the microfacies as braided river channel bar, distributary channel and point bar. Through fitting the production performance data by single well numerical simulation to correct the reservoir parameters, a fine geological model reflecting the real situations of reservoir might be obtained, by which the control area and reserves of single well were valuated and the reservoir heterogeneity was analyzed, thus deepening geologic-knowledge. The research results indicated that, in consideration of the fact that the lenticular sandbody multilayer heterogeneity model of reticular low-permeability distribution was more suitable to the braided river deposit reservoirs, this, after all, was one effective way of utilizing the multiple model contrast assessment in the early stage of oil and gas reservoir development evaluation.

关 键 词：三角洲沉积 地质模型 数值模拟 鄂尔多斯盆地 晚古生代 油气藏开发 评价方法 储层特征 

分 类 号：P618.13[天文地球—矿床学]