Sequence Division of Shiqiantan Formation in Shiqiantan Sag on Eastern Uplift of Junggar Basin

doi:10.7657/XJPG20230302

Abstract

Abstract:

In order to establish a standard section of the Upper Carboniferous Shiqiantan formation in the Shiqiantan sag on the eastern uplift of the Junggar basin, and to provide a basis for the division and correlation of the subsurface strata and for the oil and gas exploration in the sag, field survey was carried out. By using geological coastean, and through comprehensive analysis on lithological characteristics, sedimentary formations, contact relationships, marker beds, and paleontological fossils, the sequence division, sedimentary facies restoration, and regional stratigraphic correlation were completed for the Shiqiantan formation. The Shiqiantan formation underwent the deposition of alluvial fan (fan delta), pre-fan lake and bay lagoon, forming three transgression-retrogradation sequences. The Shiqiantan formation can be divided into three members. The lower member is composed of conglomerate and sandy conglomerate intercalated with sandstone and siltstone in the lower part, medium-fine grained conglomerate, graywacke, and interbeds of mudstone and silty mudstone in the middle part, and silty mudstone and mudstone intercalated with sandstone and siltstone in the upper part. The middle member is composed of conglomerate, pebbly sandstone and sandstone intercalated with siltstone in the lower part, and calcareous silty mudstone, mudstone, siltstone and argillaceous limestone in the upper part. The upper member is composed of conglomerate, sandstone and interbeds of siltstone and silty mudstone in the lower part, purple-brown and brick-red mudstone and argillaceous siltstone intercalated with gravel-bearing gritstone and conglomerate in the middle part, and dark grey mudstone and silty mudstone intercalated with limestone in the upper part. Macroscopically, the lower member, middle member, and the upper part of the upper member are dark grey, and the lower part of the upper member is light brown to brick-red; all members are normally graded. The dark mudstones of pre-fan swamp-bay lagoon facies are favorable source rocks, while the sandstones and conglomerates of mid-fan and fan-apex facies are reservoir rocks. The good source-reservoir assemblage suggests favorable petroleum geology conditions.

Key words: Junggar basin, eastern uplift, Shiqiantan sag, Upper Carboniferous, Shiqiantan formation, stratigraphic sequence, sedimentary facies, stratigraphic division

CLC Number:

TE121.34

KANG Jilun, FU Guobin, HAN Cheng, LIANG Hui, MA Qiang, LIANG Guibin, CHEN Gaochao. Sequence Division of Shiqiantan Formation in Shiqiantan Sag on Eastern Uplift of Junggar Basin[J]. Xinjiang Petroleum Geology, 2023, 44(3): 265-276.

Figures/Tables 8

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