Sedimentary facies study of the Lower Ordovician Penglaiba Formation in the southwest area of Tahe Oilfield
The Ordovician in the Tahe Oilfield is an important area for oil and gas exploration in recent years,but research on sedimentary facies types and distribution characteristics remains relatively weak,constraining further exploration efforts.Building upon previous understanding,this study combines sedimentary facies identification criteria to analyze sedimentary facies and their distribution characteristics in the study area.The results show that the Lower Ordovician Penglaihe Formation in the study area is characterized by restricted platform sedimentation,with three subfacies including tidal flats,inner-platform shoals,and lagoons,which can be further subdivided into five microfacies:cloudy tidal flat,gray cloudy tidal flat,gray argillaceous lagoon,cloudy-gray lagoon,and sandy shoal.Tidal flat sedimentation predominates in the overall study area,with lagoon sedimentation occurring in the upper part of the Penglaihe Formation.Inner-platform shoals are small in scale and isolated in distribution,longitudinally distributed in the upper part of the Penglaihe Formation,and gradually increasing in quantity from west to east in the planar direction.
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