Application of geochemical logging technology in oil and gas exploration in the southeastern margin of Bozhong sag

The Bohai Oilfield has the feature ofdiversereservoir types, various crude oil properties, low exploration density, and few sample points.It is difficult to quickly and accurately identify the oil-bearing property of reservoirs by using conventional logging data during the exploration drilling process.In recent years, geochemical logging technology has been widely used as a major logging solution in oil and gas exploration in Bohai Oilfield, and has gradually shown great application effects and technical advantages.Based on the geochemical logging data of nearly 40 exploration wells in the southeast edge of Bozhong sag, the differences of geochemical logging parameters under different sampling conditions are proposed.Under this constraint, a three-step crude oil propertyidentification method is established by applying geochemistry map method, rendezvous plate method and regression formula method.A comprehensive method to evaluate the oil and gas possibility of the reservoir by using multiple logging series and vertical trend method is proposed.