Discovery of Ultra-Deep Rift Basin and Its Petroleum Exploration Significance in Sikeshu Sag, Junggar Basin

doi:10.7657/XJPG20200103

Abstract

Abstract:

A major breakthrough in petroleum exploration has been made in the Sikeshu sag of the southern margin of Junggar basin and the deep geological structures, basin framework and prototype basin in the sag have attracted much attention. Based on the latest 2D seismic data, this paper analyzes the seismic reflection and structural characteristics of the deep strata in the Sikeshu sag, determines the prototype basin and restores the tectonic evolution process of the Sikeshu sag. The study results show that the Carboniferous-Cenozoic strata are widely developed in the Sikeshu sag and their thickness centers are inherited. The Sikeshu sag has a fault depression-depression structure. Taking the bottom of the Jurassic as the boundary, the structure under the boundary is a fault depression characterized by thick volcanic-clastic deposits with noted boundary faults of the prototype basin, whereas the structure above the boundary is a depression filled with terrestrial debris deposits of Jurassic-Cretaceous, which is characterized by undeveloped faults, wide distribution range and thin sedimentary thickness. Combined with regional tectonic evolution and local geological structure, the evolution of the Sikeshu sag can be divided into two stages, namely rift and depression. The Sikeshu sag might have a relatively independent tectonic-sedimentary evolution during the rift stage, and was connected with Junggar basin during the depression stage. This paper believes that the syndepositional Gaoquan fault as one of the boundary faults of the rift basin, was an active normal fault and reversed to a thrust fault in the late stage. The Permian-Triassic shales and Jurassic coal seams controlled by the rift basin are the main source rocks of the ultra-deep strata in the Sikeshu sag and have great petroleum exploration potenital.

Key words: Junggar basin, Sikeshu sag, Paleozoic, Mesozoic, Triassic, Jurassic, rift basin, lower reservoir-forming combination, source rock

CLC Number:

TE121.12

LIANG Zeliang, PANG Zhichao, JI Dongsheng, FENG Xingqiang, WU Lin, SHI Hui. Discovery of Ultra-Deep Rift Basin and Its Petroleum Exploration Significance in Sikeshu Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 18-24.

Figures/Tables 5

References 20

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