Seismic prediction of favorable limestone reservoirs in the fourth member of Shahejie Formation in YD high density 3D area
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摘要: YD断裂带油气富集,新近系岩性体勘探空间大,但是勘探程度较低,制约勘探效率的主要原因是储层非均质性强,分布规律复杂,同时受地震资料及常规地震预测技术的限制,岩性体有利储层地震预测难度大。基于YD地区高密度三维方位地震资料,开展了沙四段灰岩有利储层地震预测研究工作,首先利用方位地震属性的差异性,预测储层裂缝分布;然后利用基于各向异性参数反演的储层预测技术,描述储层的各向异性特征;最后联合两种地震预测技术结果,以储层裂缝分布预测为主,以储层各向异性特征作约束,综合描述研究区沙四段灰岩储层裂缝发育程度,提高了沙四段灰岩有利储层地震预测精度。Abstract: Yidong fault zone is rich in oil and gas,and the exploration space of the tertiary lithology body is large,but the exploration degree is low.The main reason restricting the exploration efficiency is that the reservoir heterogeneity is strong and the distribution rule is complex.At the same time,due to the limitation of seismic data and conventional seismic prediction technology,the favorable reservoir seismic prediction of lithologic body is difficult.Based on the high density three-dimensional azimuth seismic data of YD area,the authors carried out the research on the favorable reservoir seismic prediction of the fourth member of Shahejie Formation.Firstly,the difference of azimuth seismic properties was used to predict the distribution of fractures in the reservoir.Then the anisotropic reservoir prediction technique based on anisotropic parameter inversion was used to describe the anisotropic characteristics of the reservoir.Finally,combined with the results of two kinds of seismic prediction techniques,with the fracture distribution as the main predicted object and the reservoir anisotropy characteristic as the restricted condition,the authors described the fracture development degree of the limestone reservoir in the fourth member of Shahejie Formation comprehensively and improved the prediction accuracy of the favorable limestone reservoir in the fourth member of Shahejie Formation.
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Key words:
- high density 3D /
- favorable reservoir /
- seismic prediction /
- YD fault zone
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