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以区域地质研究为基础,通过三维地震解释并利用有机地球化学分析等技术手段,综合分析了川西坳陷回龙构造雷口坡组天然气成藏条件及其勘探潜力。结果表明,回龙地区海相烃源岩发育,纵向上沟通雷口坡组和下伏二叠系海相层系的烃源断裂及横向上雷口坡组顶部不整合面可作为油气的良好运移疏导体系,天然气成藏具有“双源供烃”的良好气源条件,且雷口坡组优质储层发育,并具有良好的生储盖组合。回龙构造圈闭类型好、断鼻圈闭面积大,且雷口坡组顶面岩溶缝洞发育区域与高部位相叠合。该区的研究及突破对于扩大川西整个雷口坡组的勘探范围和勘探领域具有重要意义,是下一步部署风险探井的有利目标区域。
Based on the study of regional geology, the gas accumulation conditions and exploration potential of the Huikoupo Formation in the Huilong Formation of the western Sichuan depression were comprehensively analyzed through three-dimensional seismic interpretation and the use of organic geochemical techniques. The results show that the hydrocarbon source rocks in the Huilong area are developed longitudinally and the hydrocarbon source faults in the Leikoupo Formation and the underlying Permian marine system and the unconformity at the top of the Leikoupo Formation in the lateral direction can be regarded as oil and gas well Migration and drainage system. Natural gas reservoirs have good gas source conditions of “dual source hydrocarbon”, and the high-quality reservoirs of the Leikoupo Formation have good reservoir-cap assemblage. The Huilong structural trap type is good, the area of the broken nose ring is large, and the development zone of the top karst cave in the Leikoupo Formation is superposed with the high part. The research and breakthrough in this area is of great significance for expanding the exploration range and exploration area of the entire Leikoupo Formation in western Sichuan and is a favorable target area for deploying risk exploration wells in the next step.