物探与化探2024，Vol.48Issue(4)：954-961,8.DOI:10.11720/wtyht.2024.1423
东胜气田致密砂岩储层甜点预测关键技术与应用效果
Critical techniques for sweet spot prediction for tight sandstone reservoirs in the Dongsheng gas field and their application effects
摘要
Abstract
The Xinzhao gas zone of the Dongsheng gas field resides at the junction of three first-order tectonic units:Yishan slope,Yi-meng uplift,and Tianhuan depression.Due to the influence of paleogeomorphology and provenance,different channel sediments vary sig-nificantly in this zone.The main target layer is the first member of the Shihezi Formation,which hosts a braided river sedimentary sys-tem,with tight reservoirs characterized by typical low porosities and permeabilities.The effective sandstone reservoir exhibits a small thickness,pronounced heterogeneity in gas content,and low-resolution seismic data,complicating sweet spot prediction.Hence,this stud-y delved into the critical seismic prediction techniques for sweet spots in braided-river tight sandstone reservoirs.Firstly,the stratigraph-ic framework was established based on the three-dimensional seismic relative isochronous surface,characterizing the spatial distributions of channel sand bodies at different stages using the relative-spatial-resolution stratal slicing technique.Then,the seismic data were trans-formed from the time domain to the frequency domain using the wavelet transform time-frequency analysis technique.Based on the anal-ysis of instantaneous spectrum differences in seismic data of different channels,the qualitative gas content prediction was achieved using the low-frequency energy ratio and the ABV absorption attribute,effectively supporting well deployment.Finally,the facies-controlled geostatistical inversion in the depth domain combining logs and seismic data was conducted for quantitative reservoir prediction,guiding the accurate design and optimization of horizontal well trajectories.The application of these techniques has increased the probability of penetration of gas reservoirs in the study area by seven percentage points,demonstrating satisfactory application effects.关键词
致密砂岩/储层预测/含气性预测/水平井轨迹设计Key words
tight sandstone/reservoir prediction/gas content prediction/trajectory design of a horizontal well分类
天文与地球科学引用本文复制引用
曹绍贺,任凤茹,王霄霄..东胜气田致密砂岩储层甜点预测关键技术与应用效果[J].物探与化探,2024,48(4):954-961,8.基金项目
中国石化科研项目"致密砂岩储层甜点地球物理识别预测技术研究"(P21050-3) （P21050-3）
