摘要
准噶尔盆地玛湖凹陷东斜坡百口泉组砂砾岩储集层"甜点",具有侧向叠置严重、厚度较小、非均质性较强的特点,基于常规资料准确预测该类储集层的难度较大。而以方位各向异性分析为核心的OVT域叠前地震属性分析技术,能够充分利用叠前地震资料蕴含的地质信息和流体信息,可以更有效地进行储集层预测。但是由于原始OVT域道集受不稳定的能量、不均衡的密度以及较低信噪比的影响,其道集质量不稳定。因此,介绍了一种从道集评价及预处理开始,利用动态分析寻找优势的道集方位,并进行部分道集叠加提高地震资料的成像质量及分辨率的方法。利用处理后的地震资料,在玛东地区预测了"甜点"储集层的分布,预测"甜点"储集层发育区面积约140 km^2,为玛东地区井位部署和储量落实提供了依据。
The sweet spot of the sandy conglomerate reservoir in Baikouquan formation on the eastern slope of Mahu sag, Junggar basin ischaracterized by serious lateral superimposition, small thickness and strong heterogeneity. It is difficult to accurately predict this kind ofreservoir with conventional data. OVT-domain prestack seismic attribute analysis technology which takes azimuthal anisotropy analysis asthe core can fully use the geological and fluid information contained in prestack datasets and do reservoir prediction more efficiently. Butdue to the influences of unstable energy, unbalanced density and relatively low signal-noise ratio on original OVT-domain gathers, the gath-er quality is not very good. Therefore, the paper introduces a new method which can use dynamic analysis to find the advantageous azimuthof gathers, do stacking of partial gathers and finally improve imaging quality and resolution of seismic data. The processed seismic data isused to predict the sweet-spot reservoir distribution in the eastern Mahu area. The predicted area of the sweet-spot reservoir is about 140 km^2, which provides basis for well deployment and reserves estimation in the eastern Mahu area.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2018年第1期104-108,共5页
Xinjiang Petroleum Geology
基金
国家青年基金项目(41402127)
关键词
玛湖凹陷
百口泉组
砂砾岩储集层
“甜点”
OVT域
叠前反演
弹性参数
宽方位
Mahu Sag
Baikouquan formation
sandy conglomerate reservoir
sweet spot
OVT domain
prestack inversion
elastic parameter
wide azimuth
