叠前地质统计学反演技术在复杂储层量化预测中的应用

doi:10.11743/ogg20130618

摘要/Abstract

摘要： 地震确定性反演、叠后地质统计学反演是目前致密碎屑岩气藏普遍采用的储层预测技术，但针对复杂岩性结构和复杂波阻抗特征的薄储层，这些反演方法的适应性有限。叠前同时反演与地质统计学反演技术的结合是此类储层量化预测的有效方法，不仅可提高纵、横向分辨率，还可解决储层与围岩波阻抗叠置情况下有效储层的识别问题。叠前同时反演技术可以得到纵波阻抗体、横波阻抗体、纵横波速度比体和密度体，能够解决复杂波阻抗储层的识别问题，但反演受地震频带限制，纵向分辨率有限。基于随机建模技术的叠前地质统计学反演方法，能有效地综合地质、测井和三维地震数据，极大地提高预测结果的纵、横向分辨率，实现储层的精细描述，在叠前确定性反演的基础上可以更好地识别薄层及薄互层储层，为陆相致密碎屑岩气藏储层描述提供了重要技术支撑，在川西新场须四气藏储层预测应用效果明显。

关键词: 分辨率, 确定性反演, 随机模拟, 叠前地质统计学反演, 复杂储层, 储层量化预测

Abstract: The deterministic inversion technology and the post-stack geo-statistics inversion technology have been widely adopted in prediction of tight clastic reservoirs.However,they are not very effective in prediction of thin reservoirs with complex lithologic structure and wave impedance.The combination of the simultaneous inversion technology and the pre-stack geo-statistics inversion technology is effectively applied in the quantitative prediction of such reservoirs.The application of these technologies can not only improve the vertical and horizontal resolution but also can recognize effective re-servoirs even when the impedances of surrounding rocks and reservoirs are overlapped.Although the pre-stack simulta-neous inversion technology can extract P-wave impedance,S-wave impedance,v_P/v_S and density,and can recognize reservoirs with complex impedance,it has limited vertical resolution due to the limitation of frequency band.Stochastic mode-ling-based pre-stack geo-statistics inversion technology can effectively integrate geological,logging and 3D seismic data,greatly improve both vertical and lateral resolutions,thus can realize fine description of reservoirs.Based on deterministic pre-stack inversion,this technology can effectively identify thin reservoirs and thin interbedded reservoirs.It has been successfully applied to the prediction of reservoirs in the 4^th Member of Xujiahe Fm in Xinchang gas field of western Sichuan Basin, a continental tight clastic gas field.

Key words: resolution, deterministic inversion, stochastic simulation, pre-stack geo-statistics inversion, complex reservoir, quantitative prediction of reservoirs

中图分类号:

TE122.2

钱玉贵,叶泰然,张世华,等. 叠前地质统计学反演技术在复杂储层量化预测中的应用[J]. 石油与天然气地质, 2013, 34(6): 834-840. doi: 10.11743/ogg20130618 Qian Yugui,Ye Tairan,Zhang Shihua,et al. Application of pre-stack geo-statistics inversion technology in quantitative prediction of complex reservoirs[J]. Oil & Gas Geology, 2013, 34(6): 834-840. doi: 10.11743/ogg20130618

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