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川东W地区多口井在二叠系茅口组具有不同程度的油气显示,测试产能较高。前人的研究成果认为茅口组属于裂缝型储层,未对白云岩发育层段的特征进行详细研究。根据大量的钻井地质资料,分析总结了茅二a亚段白云岩储层的地质特征,利用90°相移技术在薄地层和岩性解释上的优势,采用川东W地区近年采集的三维地震资料进行不同角度的相移尝试,使地震反射同相轴与岩层相对应,大大提高了储层预测成果的精确度。通过对比实际钻井成果,讨论了不同角度相移对储层预测的影响,并分析了90°相移技术与道积分技术的差异,最终认为90°相移技术适用于川东地区的薄储层解释。
Many wells in the eastern Sichuan W area show varying degrees of oil and gas in the Maokou Formation in the Permian, indicating higher test productivity. The predecessor’s research results show that the Maokou Formation belongs to the fractured reservoirs, and the characteristics of the dolomite developmental stages have not been studied in detail. Based on a large number of drilling geological data, the geological characteristics of dolomite reservoirs in Mao’e-a sub-region are analyzed and summarized. Taking advantage of the 90 ° phase-shift technique in thin stratigraphy and lithology interpretation, the 3D seismic data acquired in recent years in W Data from different angles of phase shift attempt, so that the seismic reflection events and rock strata corresponding to greatly improve the accuracy of reservoir prediction results. By comparing actual drilling results, the influence of phase shift at different angles on reservoir prediction is discussed, and the difference between 90 ° phase shift technique and channel integration technique is analyzed. Finally, the 90 ° phase shift technique is applied to the thin reservoirs in eastern Sichuan Explanation.