饶阳凹陷蠡县斜坡三角洲前缘薄互层砂泥岩储层预测

Reservoir Prediction of Sand and Shale Interbedded Layers on Delta Front of Lixian Slope of Raoyang Sag

饶阳凹陷蠡县斜坡主要勘探目的层沙一段、沙二段以三角洲前缘薄互层砂泥岩沉积为主,具有较大的岩性油气藏勘探潜力,但是由于单砂层薄、岩性细,与泥岩围岩地球物理响应差别小,常规地震资料难以分辨,使得纵向识别薄砂层及横向描述砂体展布规律难度加大。通过综合分析与实际应用,在精确井震标定、精细地震解释的基础上,按点标定、线约束、体运算、分段描述的预测流程,应用谱白化拓频处理、拟声波模型反演、频谱分解等技术,开展了储层预测工作,提高了储层预测的精度,为该区岩性油气藏的勘探与发现亿吨级规模储量提供了重要技术支撑。

Es1 and Es2 are the main drilling target strata of Lixian slope of Raoyang sag. They are dominated by deposits of sand and shale interbedded layers on the delta front and have great potential in lithologic reservoir exploration. However, because the monoclinal stratum of sandstone is thin and fine, and its geophysical response is close with the nearby mudstone stratum, it gets hard to distinguish them, to vertically recognize thin sands and horizontally describe sand body shape only using conventional seismic data. Through comprehensive analysis and practical application, on the basis of accurate well-seismic correlation and delicate seismic interpretation, in accordance with the predicting flow of point correlation, thread restriction, cube calculation and segmental description, the spectrum- whitening and frequency-broadening processing technology, the pseudo-acoustic model inversion technology, the spectral decomposition technology and other technologies are used for reservoir prediction, which enhances the precision of prediction and provides important technological support for exploration of lithologic reservoirs and discovery of hundred-million-ton scale reserves.