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周口盆地位于淮河流域上游,横跨豫、皖两省,广大地区均被第四系所覆盖。近几年来,随着石油普查和勘探工作的进展,盆地中第四系以下地层已有许多新的揭露和发现。1983年在周口盆地沈丘拗陷的钻探工作中,南2井和周参10井相继揭露了一套黑灰色地层,主要岩性为深灰色、黑灰色泥岩与浅灰色、灰色粉—细砂岩互层夹多层碳质页岩和煤线,厚约606米。在其中发现了丰富的孢粉化石,经笔者研究和鉴定,发现有47属,74种,其中有3个新种。该孢粉化石组合指示这组地层地质时代为早白垩世。周口盆地早白垩世黑灰色地层的发现,为石油和天然气的勘探开拓了新的领域。
Zhoukou basin is located in the upper reaches of the Huaihe River Basin, across Henan and Anhui provinces, the vast area covered by Quaternary. In recent years, with the progress of oil census and exploration, many new revelations and discoveries have been made in the basins below the Quaternary. In the drilling work of the Shenqiu depression in Zhoukou basin in 1983, a series of dark gray stratums were successively exposed from Well Nan 2 and Zhoushen 10, with the main lithologies of dark gray, dark gray mudstone and light gray, gray powder-fine sandstone Multi-layer interbed carbonaceous shale and coal line, about 606 meters thick. In the discovery of rich sporo-pollen fossils, the author of research and identification, found in 47 genera and 74 species, of which there are three new species. The sporopollen assemblages indicate that the stratigraphy of this group of geologic age was Early Cretaceous. The discovery of the Early Cretaceous dark-gray stratum in the Zhoukou basin opens up new fields for oil and gas exploration.