鄂尔多斯盆地致密碎屑岩储层地震识别及预测

Seismic detection and prediction of tight gas reservoirs in the Ordos Basin

鄂尔多斯盆地北部已经发现了多个致密-低渗透岩性气田,主要含气层位自下而上为上石炭统太原组、下二叠统山西组和下石盒子组。针对岩性圈闭、致密-低渗透碎屑岩储层中存在的难点,在气田勘探开发过程中,开展了地震储层综合预测和描述技术研究,开发应用了岩石物理、属性优化,分频成像、随机模拟反演等技术,形成了以突出低孔、低渗、致密储层为目标的完整的储层预测预测技术系列,有效地提高了预测的精度,为产能建设的持续开展提供了可靠的技术支撑。

Several tight lithologic gas fields with low permeability have been found in the north of Ordos Basin. From bottom to top, their main gas-bearing strata are the Taiyuan Formation of the Upper Carboniferous, the Shanxi Formation and lower Shihezi Formation of the Lower Permian. In view of the characteristics of lithologic traps and tight elastic reservoirs with low-permeability, studies are performed on integrated seismic reservoir prediction and characterization techniques for exploration and production of these gas fields. Corresponding techniques ,including rock physics analysis, seismic attribute optimization, frequency decomposition and stochastic simulation inversion, are developed and applied. They form a complete series of reservoir prediction techniques that are suitable for tight clastic reservoirs with low porosity and low permeability, and can enhance the accuracy of reservoir prediction and promote the development process of tight gas fields in Ordos Basin.