Abstract：There are different opinions on how to classify the formations of Lower Cretaceous in the Juyanhai Depression in the Yin'e Basin. The abrupt change in vi-trinite reflectance is used to identify the unconformities. The Estherian fossils found in well Mengedi 1 is used to analyze the formations. The lithological and electrical characteristics shown in wells such as Tian1 prove that the Permian formation is characterized by low AC and high Rt. Finally,according to the unconformity on the seismic profiles,the Lower Cretaceous Bayingobi Formation identified by previous studies is classified into the Permian. This finding suggests a great oil and gas potential in the Permian exploration in the Juyanhai Depression.
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