宽频地震数据碳酸盐岩叠前储层预测——以滨里海盆地东缘B区块为例

Carbonate reservoir prediction with broadband seismic data:A case study from the East Block B of Pre-Caspian Basin

碳酸盐岩储层预测是困扰业界多年的难题.结合滨里海盆地东缘B区块宽频带采集处理的地震资料,运用宽频带储层预测方法,开展了碳酸盐岩叠前储层预测研究.首先对研究区已钻井资料进行岩石物理分析,优选出储层敏感参数,然后细分宽频带地震数据,研究每一段频率成分对岩性的响应,确定地震信息与测井信息复合的低频模型;在此基础上,应用叠前弹性参数反演预测储层含油气性空间分布规律,同时利用井震联合协同模拟定性半定量预测薄储层物性,结合综合研究成果,最终确定有利储层发育带,部署预探井位,并获得了高产油气流.研究表明,宽频地震数据能够大幅度提高储层识别精度,特别是低频地震信息的应用有效改善了储层横向识别能力,降低了储层预测中的多解性,从而证实了宽频地震数据储层预测技术的可靠性和实用性,为碳酸盐岩储层预测提供了有效的预测手段.

The prediction of carbonate reservoir is a challenging task in seismic exploration for many years.Taking the Block B of eastern margin of the Pre-Caspian Basin as an example,a prestack Carbonate reservoir prediction method using broadband seismic data was presented.First,petrophysical analysis was performed on drilled wells within the work area to select reservoir sensitive parameters.Second,broadband seismic data was segmented to study the response of each band of frequency component to the lithology,to obtain a low-frequency model that combines seismic information with log information.On that basis,the spatial distribution of oil-gas bearing properties in the reservoir was predicted through prestack elastic parameter inversion,and the physical properties of thin reservoir were predicted qualitatively or semi-quantitatively using log-seismic co-simulation method.Finally,various study results were combined to define the development belt of favorable reservoirs,and to design the location of preliminary exploration wells.The results showed that the broadband seismic data can greatly improve the accuracy of reservoir identification,the low-frequency seismic information could improve the reservoir lateral recognition and reduce the multi-solution of reservoir prediction.The abundant oil and gas flows provided by these wells have proved the reliability and practicability of carbonate reservoir prediction using broadband seismic data.