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在岩心观察、薄片鉴定及地震分析基础上,开展马家沟组岩溶地质及其地球物理响应分析,综合运用印模法和残余厚度法恢复马家沟组顶部岩溶古地貌形态。研究表明研究区马家沟组顶部发育岩溶洼地、岩溶斜坡及岩溶高地3种古地貌单元,马家沟组岩溶古地貌具有“一高地、两斜坡、两洼地”的特点,岩溶洼地地层保存基本完整,岩溶高地普遍缺失马五_3段及以上地层,而岩溶斜坡的地层缺失情况介于岩溶洼地和岩溶高地之间。
On the basis of core observation, slice identification and seismic analysis, karst geology and geophysical response analysis of Majiagou Formation are carried out. The top of karst paleogeomorphology of Majiagou Formation is restored by means of imprint method and residual thickness method. The study shows that there are three kinds of palaeogeomorphic units on the top of the Majiagou Formation in the study area, such as karst depressions, karst slopes and karst highlands. The karst paleogeomorphology of the Majiagou Formation has the characteristics of “one high ground, two slopes and two depressions” Preservation of the basic integrity of the karst highlands generally missing Ma5_3 and above strata, and karst slopes of the lack of strata between karst depression and karst highlands.