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0 20260303

DOI: https://doi.org/10.11698/PED.20250510

Hydrocarbon accumulation characteristics and exploration progress of the Triassic Jiucaiyuan Formation in the eastern Fukang Sag, Junggar Basin, NW China

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  • 1. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Engineering, China University of Petroleum (Beijing), Beijing 102249, China;
    3. PetroChina Tuha Oilfield Company, Hami 839009, China

Received date: 2025-09-18

  Revised date: 2026-03-24

  Online published: 2026-01-12

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Abstract

Based on data from drilling, logging, seismic surveys and tests, a systematic study was conducted on the petroleum geological characteristics and hydrocarbon accumulation features/models of the Triassic Jiucaiyuan Formation in the eastern Fukang Sag of the Junggar Basin. The favorable exploration targets were identified. First, the highly mature, high-quality saline lacustrine source rocks developed in the Permian Lucaogou Formation in the eastern Fukang Sag are characterized by continuous and efficient hydrocarbon expulsion over multiple stages, providing a critical material foundation for large-scale hydrocarbon accumulation in the Jiucaiyuan Formation. Second, the Jiucaiyuan Formation, a dual source/sink system, represents a distal, large-scale braided river delta sedimentary system originated from Karamaili, with well-preserved intergranular pores and fractures, providing good reservoir conditions. Third, the middle and upper parts of the Jiucaiyuan Formation contain thick, high-quality mudstone caprocks. Source-connected faults and associated fracture systems serve as effective pathways for hydrocarbon migration and accumulation. The continuous hydrocarbon generation and pressurization conditions are favorable for the formation of ultra-high-pressure oil and gas reservoirs. Fourth, the effective spatial configuration of various accumulation elements contributes a hydrocarbon accumulation model characterized by “lower generation, upper accumulation, fault transportation, sandbody-fracture storage, and overpressure-driven enrichment”, resulting in the current structural-lithologic reservoirs within the Jiucaiyuan Formation. Fifth, the most favorable exploration targets are areas adjacent to the hydrocarbon generation center of the Lucaogou Formation, with superior structural settings and well-developed faults and sandbodies, corresponding to the prospective trap area of 263 km2 and the possible resources amounting to 1.68×108 t. Sixth, the zones with efficient coupling of five elements (source, fault, sandbody, fracture, and pressure) are recommended as preferential targets for seeking additional large-scale petroleum discoveries in the Jiucaiyuan Formation. The renewed major breakthrough in the Triassic petroleum exploration in the Fukang Sag, represented by a high flow rate of 56.16 m3/d at Well Fukang-2 during test, has underscored its significant potential and promising prospects for large-scale exploration. The resulting study is expected to promote a stacked multi-layer exploration pattern in the eastern part of the Junggar Basin and have an important strategic significance for oil and gas exploration in the Triassic across the basin.

Key words： Junggar Basin; Fukang Sag; Triassic; Jiucaiyuan Formation; structural-lithologic trap; hydrocarbon accumulation condition; Well Fukang-2

Cite this article

KANG Jilun, LI Shilin, WANG Lilong, GAO Gang, ZHANG Wei, MA Qiang, JIA Guoqiang, YU Haiyue, ZHANG Qi, YU Xiaohua, FU Guobin, QING Zhong . Hydrocarbon accumulation characteristics and exploration progress of the Triassic Jiucaiyuan Formation in the eastern Fukang Sag, Junggar Basin, NW China[J]. Petroleum Exploration and Development, 0 : 20260303 . DOI: 10.11698/PED.20250510

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