复合水下分流河道砂体精细刻画在姬黄32区块长81^1油藏开发中的应用

Application of fine description of composite underwater distributary channel sand in the development of Yanchang group 81^1 reservoir,Jihuang 32 block

基于姬黄32区块长811储层水下分流河道内单砂体的垂向分期、侧向分界的测井相标志识别,总结了单砂体的叠置样式,分析了A/S值变化对单砂体叠置模式及单砂体间连通性的影响;利用密井网小井距资料建立的单砂体宽厚比定量预测模式,完善了单砂体展布的研究精度。研究表明该区长811油层纵向上4个单层内共发育31个单砂体,单砂体宽度180~650 m,厚度1.8~7 m,宽/厚比70~120,平面上呈北西-南东方向条带状展布。根据研究结果对“有注无采、有采无注”的井组注采井网配套后,取得明显的效果,指导同类油藏的精细注采管理。

Based on the identification of vertical stages and lateral boundary logging facies markers of single sand bodies in the underwater distributary channel of Chang 811 reservoir in Jihuang 32 block,the superimposition patterns of single sand bodies are summarized,and the influence of A/S value changes on the superimposition patterns of single sand bodies and the connectivity between single sand bodies is analyzed.The quantitative prediction model of width-thickness ratio of single sand bodies based on the small well spacing data of dense well pattern improves the research accuracy of the distribution of single sand bodies.The results show that there are 31 single sand bodies in the four single layers of Chang 811 reservoir in this area.The width of single sand bodies is 180-650 m,the thickness is 1.8-7 m,the width/thickness ratio is 70-120,and it is a ribbon in the direction of NW-SEE in the plane.According to the research results,obvious results have been achieved after matching the injection-production pattern of the well groups with or without injection,which can guide the fine injection-production management of the same kind of reservoirs.