Application of Reservoir Seismic Inversion at Damintun Sag in Liaohe Oilfield
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摘要: 针对大民屯凹陷构造复杂、薄互层储层横向变化快等特殊地质条件, 在叠前时间偏移和叠后高分辨处理的地震资料基础上, 利用以已知地质规律和测井资料为约束的储层地震反演新技术, 对地下岩层空间结构和物理性质进行反演、综合岩性解释、定量预测和描述储层空间分布及变化规律.通过叠前高分辨地震资料波阻抗反演、测井多属性反演方法的研究和应用, 提高了该区储层预测的纵向分辨率, 加强了对薄互层砂体的识别能力, 提高了储层预测的可靠性, 落实了有利的岩性圈闭, 获得了较好的地质效果, 为该区隐蔽油气藏的勘探做了有意义的探索.Abstract: According to the special geological conditions at Damintun sag in Liaohe basin, such as complex structures and rapid lateral change of thin and interbedded reservoirs, the technique of logging constrained seismic inversion based on pre-stack high-resolution seismic data was used to describe oil-gas reservoirs. In combination with lithologic interpretation, reservoir seismic inversion can effectively identify underground complex geologic structures and seismic anomalous reflection volume and quantitatively predict the distribution of sandstones in space and the law of their variation. The paper studies the method for reservoir prediction by using logging-restrained inversion technique based on the restriction of geological conditions and log to find out the rule of reservoir distribution in this region and fix prospective lithologic traps. And we have obtained satisfactory results in the exploration and development of the oilfield.
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Key words:
- reservoir inversion /
- wave impedance /
- log restriction
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图 1 沈229井、沈628井合成记录相关对比成果图
Fig. 1. The correlation of synthetic seismogram in Wells Shen229 and Shen628
图 2 过沈232和沈635井波阻抗反演低频模型
Fig. 2. The lower frequency model of impedance inversion through Wells Shen232 and Shen635
图 3 沈223—沈635井连井线波阻抗反演剖面
Fig. 3. The impedance inversion profile from Wells Shen223 to Shen635
图 4 过沈232和沈635井高分辨资料波阻抗低频模型
Fig. 4. The lower frequency impedance model of high resolution data through Wells Shen232 and Shen635
图 5 沈223—沈635井连井线高分辨资料波阻抗反演剖面
Fig. 5. The impedance inversion profile of high resolution data from Wells Shen223 to Shen635
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