Stratigraphic Division and Exploration Potential Analysis of Lower Carboniferous in Chepaizi Uplift, Northwestern Junggar Basin

doi:10.11885/j.issn.1674-5086.2021.04.20.01

Abstract

Abstract: This study uses field outcrops, earthquakes, and the latest drilling and logging data to subdivide the Lower Carboniferous strata in the Chepaizi Uplift, and to conduct exploration potential analysis. Our research indicates that the lower Carboniferous strata in the Chepaizi Uplift have obvious three-division characteristics. From bottom to top, there are volcanic rocks of the Tailegula Formation, interbedded volcanic rocks and sedimentary rocks of the Baogutu Formation, sedimentary rocks of the Xibekulas Formation, and three sets of strata in the rock. There are obvious differences in characteristics, logging response, and seismic reflection. In horizontal direction, the Tailgula Formation is distributed throughout the region, with north-south concave and uplifts alternating. The Baogutu Formation and the Xibekulas Formation spread out in a north-south direction, eroding and pinching east to west. In general, volcanic reservoirs are better than sand-conglomerate reservoirs, and volcanic breccias have better physical properties than andesite. The explosive facies and intermediate-basic overflow facies of the Tailegula Formation are the dominant lithofacies for reservoir development, especially the explosive facies development area in the southeast, which is located in the range of medium magnetic anomalies with wide distribution and great exploration potential.

Key words: Chepaizi Uplift, Lower Carboniferous, stratigraphic division, volcanic facies, exploration potential

CLC Number:

TE122

BIAN Baoli, HU Xiuquan, WANG Xueyong, LIU Hailei, CHENG Jinxiang. Stratigraphic Division and Exploration Potential Analysis of Lower Carboniferous in Chepaizi Uplift, Northwestern Junggar Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(3): 49-60.

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