合肥盆地安参1超深井钻遇的基底时代问题讨论

A Discussion on the Basement Time in the Deep Drill Ancan-1,Hefei Basin,Southern Margin of the North China Plate

安参1井是南华北地区唯一的一口超深井,正确认识其钻遇的前中生界地层,具有重要的理论和找矿意义。由于钻井岩芯目前尚未发现可靠的古生物等可供定年的标志,本文只能依据钻遇岩层的地质构造、地球物理、地球化学等指标进行对比分析,证明安参1井钻遇的在印支期剥蚀面以下暗色泥质岩类地层与邻近出露的新元古界青白口系具有相似性;而与石炭系—二叠系不同。

The Drill Ancan-1 is the only ultra deep Drill in the Hefei basin, Southern margin of the North China Plate. To confirm the pre-Mesozoic strata under the Hefei basin is very useful for the study of tectonics and oil--gas prospecting. Reliable fossils to determine stratigraphic time have not been found in drill samples. Based on the geotectonic, geophysic and geochemical data, and the correlation of lithological natures, thicknesses, geophysic and geochemical indicators, writers consider that the dark colored claystone in Drill Ancan-1, below the exposure level of Indosinian movement, is similar to the Neoproterozoic Qingbaikouan System, rather than the Permo--Carboniferous.