Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 56-64.doi: 10.12108/yxyqc.20260205

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Main controlling factors of hydrocarbon accumulation and exploration directions of the second member of Triassic Jialingjiang Formation, southern Sichuan Basin

GU Wen1(), CHEN Hui1, ZHU Yadong1, WU Furong1, ZHAO Zhou1, WANG Shuyan1, WANG Wei2   

  1. 1 Research Institute, BGP, CNPC, Chengdu 610213, China
    2 Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
  • Received:2025-09-01 Revised:2025-11-26 Published:2026-02-06 Online:2026-03-01

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Abstract:

Natural gas exploration and development of Triassic Jialingjiang Formation in Sichuan Basin have a long history, with cumulative proven reserves exceeding 100 billion cubic meters. Based on the latest drilling, logging, 2D and 3D seismic data, a systematic study of hydrocarbon accumulation conditions of the second member of Jialingjiang Formation in Sichuan Basin was conducted, focusing on sedimentary reservoirs, paleostructural evolution, and source-reservoir matching, and favorable exploration zones were indentified.The results show that: （1） Gas reservoirs of Triassic Jialingjiang Formation in southern Sichuan Basin are characte-rized by strong reservoir heterogeneity and long-distance hydrocarbon accumulation. Fault systems provide critical migration pathways and storage spaces, while paleostructural highs are essential for hydrocarbon accumulation. （2） Jialingjiang Formation in southern Sichuan Basin possesses favorable hydrocarbon accumulation conditions, such as multiple hydrocarbon sources, large-scale development of high-quality beach facies reservoirs, location in paleo and present structural highs, and effective connectivity to source rocks via source-connecting faults. The hydrocarbon accumulation model is “paleo-reservoir controlling scale, paleo-uplift controlling storage, faults connecting sources, and fractures controlling enrichment”. （3） Structural synclines and slope areas in southern and eastern Sichuan Basin, characterized by shallow burial depth and great exploration potential, are favorable targets for further exploration of Jialingjiang Formation in Sichuan Basin.

Key words: carbonate reservoir, beach facies, multiple hydrocarbon sources supply, source-connecting fault, Luzhou paleo-uplift, the second member of Jialingjiang Formation, Triassic, southern Sichuan Basin, Sichuan Basin

CLC Number: 

  • TE121

Fig. 1

Distribution of paleo-uplift and low steep structures of Luzhou (a) and comprehensive stratigraphic column of Triassic Jialingjiang Formation (b) in southern Sichuan Basin"

Fig. 2

Hydrocarbon accumulation characteristics of Triassic Jialingjiang Formation in southern Sichuan Basin"

Fig. 3

Thickness distribution features of Silurian source rock (a) and Upper Permian source rock (b), Sichuan Basin"

Fig. 4

Geomorphological seismic sections of the early deposition of Triassic Jialingjiang Formation, Sichuan Basin"

Fig. 5

Paleogeomorphology distribution of the early deposition of Triassic Jialingjiang Formation, Sichuan Basin"

Fig. 6

Strong and weak seismic amplitude variation of the bottom boundary of the second member of Triassic Jialingjiang Formation, southern Sichuan Basin"

Fig. 7

Paleotectonic features of Triassic Jialingjiang Formation in Caledonian paleo-uplift and its northern flank during late Indosinian to early Yanshanian, Sichuan Basin"

Fig. 8

Schematic diagram of formation and transformation of paleo-oil reservoirs in Permian Maokou Formation and Triassic Jialingjiang Formation of Luzhou paleo-uplift, southern Sichuan Basin"

Fig. 9

Classification of fault systems and hydrocarbon source rock connecting features in southern Sichuan Basin"

Fig. 10

Sedimentary facies and favorable plays of the second member of Triassic Jialingjiang Formation, Sichuan Basin"

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