综合地球物理勘探在桂中坳陷页岩气资源潜力调查中的应用研究

Application of comprehensive geophysical exploration in shale gas potential investigation in Guizhong depression

在多年的(非)常规油气勘探工作中,地震法一直是无可取代的技术手段之一,但对于类似广西地质条件复杂、地形条件恶劣的地区难以采集到高质量的地震资料,重磁电等非震方法技术则能够发挥重要作用.多年以来,在桂中坳陷针对页岩气开展的地球物理勘探工作程度很低,笔者以来宾地区较系统的重磁电工作为基础,通过联合反演与综合研究,有效减小了物探多解性、提高了推断解释的准确度和可靠性,系统查明了研究区中富有机质泥页岩目标层系的分布、埋深及厚度等特征,利用"厚深比"参数对研究区页岩气有利目标区带进行了圈定预测,为桂中坳陷地区下一步的页岩气资源潜力调查和优选靶区等工作提供了重要的基础和指导.

Seismic method has been one of the irreplaceable techniques in unconventional oil and gas exploration for many years. However, it is difficult to collect high-quality seismic data in areas with complex geological conditions and harsh topographic conditions, and non-seismic methods such as gravity, magnetism and electricity can play an important role. For many years, the geophysical exploration work for shale gas in Guizhong depression is very low. Based on the systematic gravity, magnetic and electric work in Laibin area, the author effectively reduces the multi solution of geophysical exploration, improves the accuracy and reliability of inference and interpretation, and systematically finds out the distribution and buried depth of organic rich shale target strata in the study area The "thickness depth ratio" parameter is used to delineate and predict the favorable target zones of shale gas in the study area, which provides an important basis and guidance for further shale gas resource potential investigation and target optimization in Central Guangxi depression.