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Marine Origin Petroleum Geology >

2025 , Vol. 30 >Issue 2: 157 - 166

DOI: https://doi.org/10.3969/j.issn.1672-9854.2025.02.006

The formation conditions and exploration fields of tight gas of Xujiahe Formation in Da'an exploration area, Sichuan Basin

  • LUO Yufeng , 1 ,
  • HOU Gangfu , 2 ,
  • LIU Zhanguo 2 ,
  • XIONG Jiabei 1 ,
  • WU Songlin 2 ,
  • RUI Yun 1 ,
  • CHEN Xingyu 2 ,
  • YUAN Xiaojun 1 ,
  • SONG Bing 2 ,
  • WU Jin 2 ,
  • LIU Shaozhi 2
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  • 1. Research Institute of Exploration and Development, PetroChina Zhejiang Oilfield Company
  • 2. PetroChina Hangzhou Research Institute of Geology
HOU Gangfu, MSc, Senior Engineer, mainly engaged in sedimentology-reservoir geology and oil and gas exploration. Add: No. 920 Xixi Rd., Xihu District, Hangzhou, Zhejiang 310023. E-mail：

LUO Yufeng, MSc, Engineer, mainly engaged in oil and gas exploration and research. Add: No. 9 Jingshanwan Rd., Yuhang District, Hangzhou, Zhejiang 311100, China. E-mail:

Received date: 2024-10-09

  Revised date: 2024-12-03

  Online published: 2025-05-13

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Abstract

In order to clarify the conditions for the formation of tight gas reservoirs in complex structural deformation zones and implement the next exploration areas, a systematic study is conducted on the hydrocarbon source rocks, sedimentary systems, tight sandstone reservoirs, and trap conditions of the Xujiahe Formation in Da'an exploration area of Sichuan Basin. The results show that: (1)The Xujiahe Formation in the Da'an exploration area has developed a shallow water delta sedimentary system, and the multi-stage sand bodies of the delta plain braided distributary channels in the 4th and 6th members are stacked and connected. Due to compaction and cementation, the reservoirs were generally dense, and later dissolution and fractures effectively improved the physical properties of the reservoirs. (2)The 3th and 5th members are the main source rock layers in the study area. The source rocks are thick, wide distribution in area, and have high organic matter content, mainly consisting of type Ⅲ and type Ⅱ2 kerogen. Currently, they are in the mature to high mature stage, laying a resource foundation for the formation of tight gas reservoirs in Da'an exploration area. (3)The tight sandstone reservoirs of the 4th and 6th members are interbedded with the source rocks of the 3th and 5th members in an uneven thickness in the vertical direction, forming a lower source-upper reservoir combination, which is conducive to the formation of structural gas reservoirs. The main source rock layers of the 3th and 5th members are developed with "mudstone wrapping sandstone" type meandering river channel sand bodies and tight sandstone reservoirs, forming a self generating and self storing combination, which is conducive to the formation of lens-shaped lithological gas reservoirs. The main part of Danfengchang anticline belt and the north, middle, and south wings of Linjiang syncline, as well as the east wing of Yunjin syncline are proposed as the key replacement areas of structural gas reservoir of the 4th and 6th members in Da'an exploration area. Of the Danfengchang anticline, the north of Laisu syncline, and the central part of Linjiang depression, the 3th and 5th members are integrated with source and reservoir, which is conducive to the formation of a "mudstone wrapping sandstone" type structural-lithological gas reservoir and is a potential exploration area for tight gas reservoirs in the next step.

Key words： shallow water delta; tight sandstone gas; accumulation model; exploration field; Xujiahe Formation; Da'an exploration area; Sichuan Basin

Cite this article

LUO Yufeng , HOU Gangfu , LIU Zhanguo , XIONG Jiabei , WU Songlin , RUI Yun , CHEN Xingyu , YUAN Xiaojun , SONG Bing , WU Jin , LIU Shaozhi . The formation conditions and exploration fields of tight gas of Xujiahe Formation in Da'an exploration area, Sichuan Basin[J]. Marine Origin Petroleum Geology, 2025 , 30(2) : 157 -166 . DOI: 10.3969/j.issn.1672-9854.2025.02.006

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