A comprehensive lithology identification technology for the buried-hill reservoirs with complex lithology in the Bohai Sea

BZ19-6 structure is located in the southwest of Bozhong Sag, and its Archean buried-hill reservoir is mainly composed of igneous rock and metamorphic rocks, commonly including ganite and granite gneiss.Geological and logging data show that it is lithologically complex and different lithologies vary greatly in physical and chemical properties, which brings about challenges to the effective evaluation of the buried-hill reservoir.In order to identify the lithologies of the buried-hill reservoir, the response characteristics of the main lithologies in the buried-hill reservoir in conventional logging and electrical imaging logging were summarized in this paper.Then, based on RoqScan real-time wellsite mineral analysis technology, a set of lithology identification technology suitable for this study area was established.And its application to actual lithology identification in this area is satisfactory.