Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (4): 12-22.doi: 10.12108/yxyqc.20260402

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary models and fine characterization of subtle organic reefs in Permian Changxing Formation, Yuanba area, Sichuan Basin

WANG Zheng1(), XU Shoucheng1,2(), HU Xiuquan2, LING Hang1, TU Wenmao3, ZHOU Yue1, ZHANG Xiaoqing1, SUN Wenna4   

  1. 1 Exploration and Development Research Institute, Sinopec Southwest Oil & Gasfield Company, Chengdu 610041, China
    2 College of Energy (College of Modern Shale Gas Industry), Chengdu University of Technology, Chengdu 610059, China
    3 South Branch, Sinopec Geophysical Corporation, Chengdu 610213, China
    4 Yankuang Guohong Chemical Co., Ltd., Shandong Energy Group Co., Ltd., Jining 273500, Shandong, China
  • Received:2026-01-20 Revised:2026-03-16 Online:2026-07-01 Published:2026-07-06
  • Contact: XU Shoucheng E-mail:wz13151767275@163.com;xushoucheng2@163.com

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Abstract:

Based on drilling, logging, and seismic data, distribution patterns and enrichment mechanisms of uranium in the overlying uranium-rich layers of subtle organic reefs in Permian Changxing Formation of Yuanba area in Sichuan Basin，were systematically analyzed. An “anoxic sealed” sedimentary model for overlying uranium-rich layers of subtle organic reefs was established. Guided by the model, an integrated technical system of “seismic target processing-uranium-rich layer constraint-fine characterization” was constructed, which achieved the detailed characterization of such reefs and predicted favorable development areas. The results show that: （1） Based on the vertical distribution of uranium content, the upper Changxing Formation in Yuanba area can be divided into three types, such as stable, top-enriched, and overall-enriched, among which the top-enriched type is the key indicator for identifying subtle organic reefs. Under the guidance of “anoxic sealed” sedimentary model, during the late depositional stage of Changxing Formation， the barrier effect of the platform-margin reef belt generated restricted anoxic environment in its back-reef area, reefs growth ceased and reefs were subsequently capped by uranium-rich layers, forming the vertical architecture of “uranium-rich layer-subtle reef ”. （2） The integrated “seismic target processing-uranium-rich layer constraint-fine characterization” technical system improves imaging quality through geological target-driven seismic processing, uses uranium enrichment distribution to focus on target areas, and then establishes a subtle organic reef seismic identification model combined with forward modeling, achieving fine characterization of the spatial morphology of reefs. According to the plane distribution characteristics of subtle organic reefs characterized by the integrated technical system, subtle organic reefs are relatively concentrated and larger in scale in W104-W11 well area and north of well W123 on the landward side, with individual reef areas of 0.36-1.25 km2. In contrast, reefs are more scattered and smaller in scale towards the inner platform, with individual reef areas less than 0.40 km2. （3） For the first well W102-4H drilled on the subtle organic reefs in the uranium-rich overlayer of the study area, tested natural gas production reached 65.50×104 m3/d, with calculated open-flow capacity of 265.12×104 m3/d. The south of well W104 and well W11 are also favorable targets for subtle organic reefs, with an estimated gas production excee-ding 100.00×104 m3/d.

Key words: subtle organic reefs overlain by uranium-rich layers, platform-margin reefs, uranium enrichment, seismic processing, paleogeomorphology restoration, middle-late Changxing Formation, Permian, Yuanba area, Sichuan Basin

CLC Number: 

  • TE122.2

Fig. 1

Planar distribution of sedimentary facies (a), and comprehensive stratigraphic column (b) of Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 2

Correlation of uranium content curves across well-tie profiles and planar distribution of uranium content of Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 3

Well-tie correlation of sedimentary facies of Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 4

Depositional models of “anoxic sealed” subtle organic reefs in Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 5

Comparison of seismic data before (a) and after (b) processing and spectrum analysis of subtle organic reefs in Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 6

Typical seismic profiles of three types of vertical uranium distribution patterns of Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 7

Microphotos of typical lithologies from Permian Changxing Formation and the overlayer of Triassic Feixianguan Formation in Yuanba area, Sichuan Basin"

Fig. 8

Planar distribution of amplitude attributes of the top boundary of Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 9

Forward modeling of the geological model (a) and seismic profile (b) of subtle organic reefs in Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 10

Distribution of paleogeomorphology of subtle organic reefs in Permian Changxing Formation in Yuanba area, Sichuan Basin"

Fig. 11

Design drawing of the well trajectory of well W102-4H drilling through subtle organic reefs in Permian Changxing Formation, Yuanba area, Sichuan Basin"

Fig. 12

Distribution of favorable areas for subtle organic reefs in Permian Changxing Formation in Yuanba area, Sichuan Basin"

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