应用褶积模型预测滴西14井区火山岩储集层  

Application of Convolution Model for Prediction of Volcanic Rocks Distribution in Dixi-14 Well Area in Kelameili Gas Field, Junggar Basin

作　　者：杜庆祥 沈晓丽[2] 李道清[3] 王彬[3] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]山东科技大学地质科学与工程学院,山东青岛266590 [3]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2014年第3期282-286,共5页Xinjiang Petroleum Geology

基　　金：中石油科技重大专项(2012E-34-10)

摘　　要：当地震子波在时间和空间上变化不大,储集层单层厚度大于地震分辨率,且盖层的波阻抗变化也不大时,通过对褶积模型的推导,得到地震振幅与纵波波阻抗之间的正相关关系公式。结合振幅、频率或波形等地震属性特征,纵向上按距离石炭系顶的反射时间,对克拉美丽气田滴西14井区的爆发相复合火山岩体进行了较为详细的剖分,完成滴西14井区复合火山岩体的岩性分布预测。滴西14井区储集层为石炭系火山岩,以爆发相火山角砾岩和凝灰岩为主,边部为溢流相玄武岩和流纹岩,岩体鞍部为凝灰质砂砾岩。随着波阻抗变大,凝灰质砂砾岩、火山角砾岩、凝灰岩、流纹岩、英安岩和玄武岩等地震振幅依次增强。研究表明该区可能存在多个火山口,火山口除了正向构造,可能还存在负向构造(即破火山口)。应用类似方法,建立了克拉美丽气田火山岩的空间喷发模式。When the seismic wavelet has little temporal and spatial changes, single reservoir time thickeness is much more than 1/4k, and the wave impedance＇s change of caprock is not large, we can get a positive correlation formula between seismic amplitude and P-wave impedance through the convolution model＇s derivation. This paper makes a more detailed subdivision to composite volcanic rocks and the lithology distribution prediction in Dixi-14 well area in Kelameili gas field by combining with the seismic attributes such as amplitute, frequency, waveform, as well as the reflection time to the top of the Carboniferous in longitudinal. Dixi-14 well area＇s reservoir belongs to Carboniferous volcanic rocks dominated by volcanic breccia and tuff, which is mainly effusive basalt and rhyolite in the rim and tuffaceous sandy conglomerate in the middle. With the wave impedance becoming larger, from tuffaceous sandy conglomerate to volcanic breccia, tuff, and then rhyolite, dacite or basalt, the seismic amplitudes enhance successively. The study suggests that there may exist many craters in the area, which include positive structure and negative structure like caldera. In the same way, this paper develops the volcanic spatial eruption modle for Kelameili gas field.

关 键 词：准噶尔盆地 克拉美丽气田 褶积模型 火山岩 爆发相 溢流相 破火山口 

分 类 号：P631.445.91[天文地球—地质矿产勘探]