四川盆地大安探区须家河组致密气成藏条件与勘探领域

罗瑀峰; 厚刚福; 刘占国; 熊加贝; 伍松林; 芮昀; 陈星渝; 袁晓俊; 宋兵; 伍劲; 刘少治

doi:10.3969/j.issn.1672-9854.2025.02.006

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海相油气地质 ›› 2025, Vol. 30 ›› Issue (2) : 157-166. DOI: 10.3969/j.issn.1672-9854.2025.02.006

勘探评价

四川盆地大安探区须家河组致密气成藏条件与勘探领域

罗瑀峰 ¹ ,
厚刚福 ² ,
刘占国 ² ,
熊加贝 ¹ ,
伍松林 ² ,
芮昀 ¹ ,
陈星渝 ² ,
袁晓俊 ¹ ,
宋兵 ² ,
伍劲 ² ,
刘少治 ²

作者信息 +

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

Author information +

文章历史 +

摘要

四川盆地大安探区为复杂构造变形区，为了厘清须家河组致密气成藏条件，落实下一步勘探领域，对其烃源岩、沉积体系、致密砂岩储层和圈闭条件开展系统研究。结果表明：①大安探区须家河组发育浅水三角洲沉积体系，须四段和须六段发育多期三角洲平原亚相辫状分流河道，砂体叠置连片分布，受压实作用和胶结作用的影响，储层普遍致密，后期溶蚀作用和裂缝有效改善了储层物性。②须三段和须五段为研究区主力烃源岩层，烃源岩厚度大、面积广、有机质丰度高，以Ⅲ型和Ⅱ₂型干酪根为主，目前处于成熟—高成熟阶段，为大安探区致密气成藏奠定了资源基础。③须四段和须六段致密砂岩储层在垂向上与须三段和须五段烃源岩成不等厚互层，构成下生上储式源储组合，有利于形成构造气藏；须三段和须五段主力烃源岩层内部发育“泥包砂”型曲流河河道致密砂岩储层，源储一体，构成自生自储式源储组合，有利于形成透镜状构造-岩性气藏。提出了丹凤场构造带背斜主体部位和临江向斜北、临江向斜中、临江向斜南、云锦向斜东等构造翼部的须四段和须六段为下一步构造气藏重点接替领域；丹凤场背斜、来苏向斜北和临江向斜中部的须三段和须五段源储一体，有利于形成“泥包砂”型构造-岩性气藏，为下一步致密气的潜在探索领域。

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.

导出引用

罗瑀峰, 厚刚福, 刘占国, 等. 四川盆地大安探区须家河组致密气成藏条件与勘探领域[J]. 海相油气地质. 2025, 30(2): 157-166 https://doi.org/10.3969/j.issn.1672-9854.2025.02.006

LUO Yufeng, HOU Gangfu, LIU Zhanguo, et al. 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 https://doi.org/10.3969/j.issn.1672-9854.2025.02.006

中图分类号： TE122.1

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Xujiahe Formation in central Sichuan Basin is characterized by large-area gas-bearing,low-degree charging,local-enrichment high-yield and complicated water-gas distribution.To verify the characteristics and the main controlling factors of natural-gas accumulation in Xujiahe Formation,comprehensive analyses have been carried out including the component and carbon isotope of natural gas,the light hydrocarbon of source rock adsorbed gas,the distribution of source rock,the physical property of reservoirs,the structural amplitude and the abnormal pressure.The results showed that natural gas in Xujiahe Formation was coal-derived gas featured with near-source and interbedded-accumulation.The source rocks owned large thickness in total but thin layer in single,and they were interbedded with sandstone which had low gas intensity and weak gas charging ability.Abnormal pressure provided charging dynamics for natural gas migration.Natural gas preferred to migrate into good-property sandbodies when gas-source was insufficient and the physical property took control of the charging degree of gas reservoirs.Local low-amplitude structure controlled the distribution pattern of gas reservoirs under slow structural background,and the higher the structure was,the more full the gas-water differentiation would be,and the easier the pure gas reservoir would develop.Overall,sandbodies inside source in Xujiahe Formation had a wonderful exploration prospect,and the northwestern,3<sup>rd</sup> member in the southwestern and 5<sup>th  </sup>member in the central of Sichuan Basin were the favorable exploration target of gas reservoirs inside source.

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