Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 4: 33 - 40

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.04.004

Geologic Exploration

Exploration breakthrough and enlightenment of the Yacheng Formation in the Yacheng 13-1 Low Uplift, Qiongdongnan Basin

  • REN Lijuan ,
  • HE Xiaohu ,
  • ZHANG Yazhen ,
  • XIE Chao ,
  • WANG Lifeng ,
  • CAI Quansheng
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  • 1. China National Offshore Oil (China) Co., Ltd., Hainan Company, Haikou, Hainan 570100, China;
    2. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China

Received date: 2024-08-27

  Revised date: 2025-05-25

  Online published: 2025-09-03

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Abstract

In recent years, significant breakthroughs have been made in natural gas exploration of the Yacheng Formation in the Yacheng 13-1 Gasfield. To further summarize geological understanding of Yacheng Formation accumulation and promote field expansion and reserve growth, based on new drilling, seismic, and analytical test data, the geological conditions for accumulation in the Yacheng Formation of the Yacheng 13-1 Gasfield were systematically analyzed. The results indicate that the Yacheng Formation reservoirs in the Yacheng 13-1 Gasfield are mainly braided river delta channel sandstones and conglomerates, with large-scale sand body development and good physical properties. The structural top is covered by Meishan Formation mudstone, and the updip direction of the flank is segmented by mudstone barriers, forming a good reservoir-seal combination, representing a typical structural-stratigraphic trap. Since the trap is located at the structural high of the Yacheng Formation, it benefits from dual hydrocarbon supply from source rocks in the Yanan Sag and the Yinggehai Basin, providing excellent conditions for hydrocarbon migration and accumulation. The breakthrough of Yacheng Formation natural gas in Well YC13-10-C also confirms the characteristics of differential enrichment and three-dimensional accumulation of the Yacheng Formation in the Yacheng 13-1 Gasfield. Therefore, around existing gas-bearing structures or gas reservoirs, conducting three-dimensional exploration research on structural-stratigraphic traps from high to low positions will be an important direction for the next step of rolling natural gas exploration within this area and similar gas reservoirs. This understanding has certain guiding significance for the next step of exploration in the Yacheng 13-1 Gasfield.

Key words： exploration breakthrough; Yacheng Formation; structural-stratigraphic trap; Yacheng 13-1 Gasfield; Qiongdongnan Basin

Cite this article

REN Lijuan , HE Xiaohu , ZHANG Yazhen , XIE Chao , WANG Lifeng , CAI Quansheng . Exploration breakthrough and enlightenment of the Yacheng Formation in the Yacheng 13-1 Low Uplift, Qiongdongnan Basin[J]. Special Oil & Gas Reservoirs, 2025 , 32(4) : 33 -40 . DOI: 10.3969/j.issn.1006-6535.2025.04.004

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