川西地区雷四段潮坪相白云岩储层预测技术与攻关方向

Dolomite Reservoir Prediction Technical and Research Direction of the Fourth Member of Leikoupo Formation in Western Sichuan

摘要: 近年来，川西在雷四段潮坪相白云岩领域取得一系列油气发现。研究表明，该储层具有“层控”、“相控”、“非均质性”等特征。针对川西雷四段潮坪相白云岩储层成因机制与特征，通过生产实践，总结了一套适用于川西该类储层的预测技术，该技术采用分步预测，总体评价的思路展开，预测结果有力支撑了川西海相勘探。该技术具体包括：应用地震相分析技术预测雷四3亚段地层展布，应用高分辨地震地层分析技术预测白云岩展布，应用高分辨率处理与反演相结合识别薄储层，应用正演模拟与多属性相结合判别储层多解性的方法技术系列。同时认为，如果能在连片、高保真及提高分辨率处理技术与叠前弹性参数反演技术这两方面取得突破，将大大提高储层预测的精度，这也是本区下一步储层预测技术研究的攻关方向。

Abstract: In recent years, we obtained a series of oil and gas discoveries in the dolomite field of the fourth member of Leikoupo Formation tidal-flat facies in Western Sichuan. Researches show that, the reservoir has the characteristics of “strata control”, “facies control” and “heterogeneity” and so on. For the genesis mechanism and the characteristic of the reservoir, through practice, this paper summarized a set of prediction techniques, which is applicable to such reservoirs in Western Sichuan. Using step-by-step prediction and overall evaluation method, the technology is carried on reservoir prediction, and the results supported the marine exploration in Western Sichuan powerfully. The technology specifically includes: predicting strata distribution, dolomite distribution, thin reservoir, reservoir effectiveness by seismic facies analysis techniques, high resolution seismic analysis techniques, high-resolution processing combined with inversion, forward simulation combined with multiple attributes respectively. If we can achieve breakthroughs in joint processing, high-fidelity, resolution-enhancing technologies and pre-stack elastic parameter inversion techniques, the accuracy of reservoir prediction will be improved greatly. Of course, they are the key research fields for the reservoir prediction technology in the future.