Simulation study of secondary oil and gas reservoir detection using marine controlled source electromagnetic method
Marine controlled source electromagnetic method plays a unique role in offshore oil and gas develop-ment,which is often employed to identify the oil and gas reservoir and assist in its location.In offshore oil and gas exploration,there are often secondary oil and gas reservoirs near the main oil and gas reservoir,which is hard to distinguish during exploration.In oil and gas exploitation monitoring,the adoption of a time-lapse con-trolled source electromagnetic method to detect the existence of secondary oil and gas reservoirs can effectively reduce the cost and improve exploration efficiency.Firstly,the two-dimensional forward simulation of the ma-rine controlled source electromagnetic method is conducted to simulate various models with different thick-nesses of the secondary oil and gas reservoir,location and distance compared to the main oil and gas reservoir,and different buried depths of the main oil and gas reservoir.The forward electromagnetic response shows obvious electromagnetic differences.Then,according to the difference in normalized amplitudes,the influence of the secondary oil and gas reservoir on the electromagnetic response is analyzed.Finally,OCCAM inversion is employed to invert simple oil and gas models under different production conditions and complex geological conditions.The results show that with the development of the production process,the response of the seconda-ry oil and gas reservoir is increasingly clear,which provides reliable reference data for offshore oil and gas ex-ploitation monitoring.
oil and gas exploitation monitoringsimulationelectromagnetic fieldtwo-dimensional inversiontime-lapse electromagnetic
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