Abstract
The lower ordovician Yingying third member in Gucheng area developed the carbonate distal steepening gentle slope platform depositional system. There are four types of facies: inner gentle slope, inner shallow gentle slope, outer shallow gentle slope and deep gentle slope. On the basis of sequence stratigraphic correlation between single well and consecutive well, the third member of ordovician in the ancient city area is divided into three quaternary sequences from bottom to top, The interior of each quaternary sequence is composed of high-level and transgression system domains, respectively. The lithofacies paleogeographic layout of the three quaternary sequence periods of the ordovician third member in the Gucheng area is compiled. This paper describes the features of lithofacies paleogeography of the quaternary sequence of Yingsan and provides a foundation for the further exploration of oil and gas of the study area.
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