Carboniferous strata and their oil and gas prospects from Wulungu depression to the north uplift in the Junggar Basin based on magnetotelluric technology

This paper is the result of oil and gas exploration engineering.

Objective In this paper, the sedimentary and distribution characteristics of Carboniferous strata are studied in the study area from Wulungu Depression to Wulungu North Uplift in Junggar Basin, which provides a basis and reference for the study of geological structure and oil and gas exploration in this area.

Methods Acquisition of magnetotelluric sounding data, combined with previous gravity, magnetic and electrical seismic data, using two-dimensional conjugate gradient inversion, optimization of electrical stratification technology to obtain the distribution characteristics of Carboniferous strata and fault structure, provides an effective method for the study of Carboniferous strata in igneous rock covered area.

Results Using magnetotelluric sounding technology combined with gravity, magnetic, electrical and seismic data to carry out comprehensive processing and analysis, the thickness map and burial depth map of the Carboniferous system in the study area were obtained, the interface between the upper and lower Carboniferous strata was preliminarily determined, and the distribution characteristics of the Carboniferous strata were identified. The Suosuoquan sag, Fuhai depression and Zhaheba depression are three subsidence centers of Carboniferous strata, which have good prospects for oil and gas exploration.

Conclsions In igneous rock covered area, the comprehensive processing and interpretation technology of magnetotelluric sounding and gravity-magnetic-electric-seismic provides effective technical support for the study of Carboniferous strata.