{
  "abstract": "The Triassic Baijiantan Formation in the Hefeng 3 block, Junggar Basin, hosts an unusual hydrocarbon accumulation characterized by the coexistence of conventional black oil and a condensate gas cap within a single reservoir. This study integrates geochemical data, PVT simulations, and fluid inclusion analysis to unravel its genesis. Results show that the reservoir is a medium-porosity, ultralow-permeability system. The black oil originated from mature Fengcheng Formation source rocks, whereas the gas cap comprises mixed-source kerogen-cracking gases from both the Fengcheng Formation and Carboniferous sources. We propose a two-stage charging model: early accumulation of Fengcheng-derived black oil, followed by late injection of highly mature Carboniferous-derived dry gas. Evaporative fractionation induced by gas invasion transformed the original volatile oil into the present-day black oil–condensate gas cap configuration. This model challenges conventional single-source interpretations and provides a new genetic framework for complex fluid-phase reservoirs in the Junggar Basin. Our findings offer practical exploration guidance for similar composite reservoirs in superimposed basins worldwide.",
  "abstract_shown": true,
  "affiliations": [
    "Chengdu University of Technology , , , ,",
    "PetroChina Xinjiang Oilfield Company , , , ,",
    "Yangtze University , , ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Xinyu Chen"
    },
    {
      "affs": [
        1
      ],
      "name": "Akedan Sikandier"
    },
    {
      "affs": [
        1
      ],
      "name": "Zhongchen Ba"
    },
    {
      "affs": [
        1
      ],
      "name": "Meirui Hua"
    },
    {
      "affs": [
        2
      ],
      "name": "Zhaolin Pu"
    },
    {
      "affs": [
        2
      ],
      "name": "Shaoyang Geng",
      "orcid": "0000-0002-8029-8956"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/439kfrk8hay4y.bib",
  "cited_by": 0,
  "doi": "10.1021/acsomega.6c06198",
  "fulltext_url": null,
  "id": "439kfrk8hay4y",
  "issns": [
    "2470-1343"
  ],
  "landing_url": "https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06198/5455822/Genesis-and-Geological-Significance-of-the-Black",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2211|Hydrocarbon exploration and reservoir analysis"
    ]
  ],
  "openalex": "W7223174558",
  "pdf_url": "https://pubs.acs.org/doi/pdf/10.1021/acsomega.6c06198",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/439kfrk8hay4y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:39Z",
      "native_id": "10.1021/acsomega.6c06198",
      "source": "crossref",
      "url": "https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c06198/5455822/Genesis-and-Geological-Significance-of-the-Black"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2470-1343",
      "subfield": "general"
    }
  ],
  "title": "Genesis and Geological Significance of the Black Oil Reservoir with a Condensate Gas Cap in the Baijiantan Formation of Hefeng 3 Block, Junggar Basin, NW China",
  "title_text": "Genesis and Geological Significance of the Black Oil Reservoir with a Condensate Gas Cap in the Baijiantan Formation of Hefeng 3 Block, Junggar Basin, NW China",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:39Z",
  "url": "https://research.draconitic.com/paper/439kfrk8hay4y",
  "venue": "ACS Omega",
  "versions": []
}