Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 131-139.doi: 10.12108/yxyqc.20250612

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Discovery of seismic anomalies in Silurian reefs in Jiange area of northwestern Sichuan Basin and their geological significance for oil and gas

YANG Liu, ZHU Yadong, LIANG Hong, DIAO Yongbo, PENG Xin, SI Guoshuai, XU Jiao, SUN Qingli   

  1. Southwest Geophysical Research Institute, BGP, CNPC, Chengdu 610213, China
  • Received:2025-03-14 Revised:2025-04-12 Online:2025-11-01 Published:2025-11-07

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Abstract: Through the analysis of high-quality 3D seismic data of multiple blocks from northwestern Sichuan Basin, seismic reflection anomalous bodies of organic reefs were discovered at the bottom of Silurian. Combided with regional well-seismic calibration, seismic geological stratigraphy, curvature seismic attribute extraction, and paleogeomorphology characterization, the characteristics, distribution and sedimentary background of these anomalies were discussed. The results show that: (1) The Silurian reef anomalies in Jiange area of northwestern Sichuan Basin have a geometric shape resembling a reef mound on seismic profiles, belonging to Shiniulan Formation. They are widely distributed across Jiange area in varing size. (2) There are numerous near NS-NW direction basement faults developed in the underlying strata of Silurian organic reefs in the study area, mostly extending to Sinian-Cambrian, connecting the source rocks of Qiongzhusi Formation, Doushantuo Formation, and Longmaxi Formation. Source rocks of Qiongzhusi Formation and Longmaxi Formation, along with Silurian organic reef reservoirs, constitute a"lower-generation and upper-storage, lateral-source and side-storage"oil and gas accumulation model. The reef group mainly developed in northern part of Late Caledonian LeshanLongnvsi paleo-uplift in the enclosed slope area. During the sedimentary period of Shiniulan Formation, the enclosed area near the paleo-uplift source area was a mixed tidal flat deposit, with a large amount of terrigenous clastic, organic reefs are small scale, with severe erosion in the later stage, and few remnants. The central part of the enclosed slope area is a tidal flat edge/carbonate gentle slope deposit, reefs are large scale and often formed composite. The lower part of the enclosed slope area is composed of shallow water continental shelf sediments, with small scale anomalous bodies and mainly point reefs. (3) Jiange area is adjacent to Deyang-Anyue rift trough, and is the center of high-quality source rocks in Qiongzhusi Formation of Sichuan Basin. The organic reef reservoir of Shiniulan Formation is in direct contact with underlying Longmaxi Formation source rocks. The widely developed basement faults and associated faults in this area are conducive to oil and gas transportation. The overlying Liangshan Formation shale is a high-quality cap rock with superior reservoir conditions.

Key words: organic reef, seismic attribute, carbonate gentle slope, basement fault, Shiniulan Formation, Silurian, Jiange area, northwestern Sichuan Basin

CLC Number: 

  • TE122
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