Sedimentary Pattern of the Shaofanggou Formation in the North Santai High Area of the Eastern Junggar Basin and its Control on Reservoir Development

doi:10.3969/j.issn.1006-6535.2023.03.002

Abstract

Abstract: To understand the sedimentary characteristics and sedimentary patterns of the Triassic Shaofanggou Formation in the North Santai High area of the eastern Junggar Basin and clarify the constraints on reservoir development, a study on the sedimentary patterns of the Shaofanggou Formation and its control on reservoir development was carried out on the basis of sedimentology and in combination with the data such as core, thin section, grain size and conventional physical properties. The study shows that there are nine typical petrographic types developed in the Shaofanggou Formation, namely channeled interlaminated conglomerate phase, platy interlaminated conglomerate phase, massive laminated conglomerate phase, channeled interlaminated sandstone phase, platy interlaminated sandstone phase, massive laminated sandstone phase, wave-formed sand laminated sandstone phase, parallel laminated siltstone phase and massive laminated mudstone phase; the Shaofanggou Formation is mainly dominated by braided river delta phase, and the sedimentary microphases include 10 types such as floodplain, abovewater braided river channel, channel bar, natural dike, underwater braided river channel, interdistributary area, underwater natural dike, estuary bar, prodelta mud and beach bar, among which, underwater braided river channel, estuary bar and beach bar reservoirs have the best physical properties, with average porosity of 17.31%, 20.66% and 21.81%, and average permeability of 6.89, 7.05 and 12.98 mD, respectively. The reservoir properties in this area are mainly controlled by sedimentation, and the high-quality reservoirs are mainly developed in underwater braided channels, estuary bar and beach bar microphase. The study can provide a theoretical basis for further fine exploration and development of oil and gas within the study area.

Key words: sedimentary pattern, braided river delta, sedimentary characteristics, Shaofanggou Formation, eastern Junggar Basin

CLC Number:

TE121

Luo Liang, Hu Chenlin, Tang Ya'ni, Dan Shunhua, Han Changcheng, Liu Ziming. Sedimentary Pattern of the Shaofanggou Formation in the North Santai High Area of the Eastern Junggar Basin and its Control on Reservoir Development[J]. Special Oil & Gas Reservoirs, 2023, 30(3): 9-18.

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