Research On Identification Technology Of Electromagnetic Seismic Reservoir Of The Carboniferous In Chepaizi Area

After several years of hard work,the Carboniferous in Chepaizi Area reported a controlled reserve of 61.01 million tons,with a forecast of 54.56 million tons,showing huge exploration potential.However,the lithologic facies of igneous rocks in this area changed rapidly,and the distribution rules are complex.In addition to this,the inside of the Carboniferous system is blank and disorderly,and the seismic phase is highly solvable.It is difficult to identify the favorable reservoirs of igneous rocks.In order to solve this problem,this paper learned from the advantage of electromagnetic ability to identify igneous rocks,combined with the high seismic resolution and the ability to better describe the igneous rocks,to identify the spatial distribution of igneous rocks.Firstly,comprehensive statistical analysis is carried out on field data,drilling core,logging data and test data to obtain reservoir electrical,magnetic and seismic property identification templates.The forward modeling is used to obtain the characteristics of the igneous rocks' gravity and magnetic anomaly response,and combined with the identification template to carry out the magnetic weak anomaly reservoir identification and extraction technology,the electromagnetic frequency division high resolution and the polarizability reservoir identification technology,and the seismic energy absorption reservoir identification technology respectively.Igneous rocks plane spread is obtained through the above.Secondly,the lithology-sensitive magnetic susceptibility curve and the electrical curve that can accurately reflect the laws of igneous reservoirs are reconstructed.Based on the finely interpreted seismic data,the seismic wave impedance model is constrained by the reconstruction curves,and the random co-simulation inversion is carried out to obtain high-resolution magnetic anomaly and electrical data.Finally,magnetic and seismic is combined to identify the igneous rocks,development zone,and the electric and seismic is combined to identify the oil and gas zone.Associated with the fracture system and structural framework,multi-factor fusion identifies the spatial distribution of igneous rocks in Chepaizi area,and divides the favorable reservoir development zone of the Carboniferous in the Pai1 area to guide the well location deployment.The analysis of the profile and plane distribution of igneous reservoirs in the study area shows that the Carboniferous igneous reservoirs are mainly developed in the middle and lower layers of the Carboniferous and the southeast of the 60-665 wells.