Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 133-144.doi: 10.12108/yxyqc.20250512

• PETROLEUM EXPLORATION • Previous Articles    

Structural characteristics of Permian Wujiaping Formation，Nanya area， eastern Sichuan Basin and their hydrocarbon reservoir control mechanism

ZHAN Lin1,2, FAN Cunhui1,2, TANG Wen3, YANG Xiyan1,2, LIU Dongxi3, LI Bo4, YANG Xinrui3   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. Chongqing Gas Field, PetroChina Southwest Oil and Gas Field Company, Chongqing 401120, China;
    4. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China
  • Received:2025-05-12 Revised:2025-06-09 Published:2025-09-06

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Abstract: Permian Wujiaping Formation in Nanya area of eastern Sichuan Basin has obtained high-yield industrial gas flow，which shows great shale gas exploration potential in the study area. Based on the characteristics of regional tectonic evolution，combined with drilling，logging，and seismic data，the structural features and their control over the generation，storage，and preservation of shale gas were analyzed. The results show that：（1）Nanya syncline area in eastern Sichuan Basin has undergone three tectonic movements，shaping the current pattern of barriertype fold belts. Faults can be classified into 5 levels，level Ⅰ faults in NE-SW direction are the main ones，with a fzult space greater than 300 m. This type of fault has a significant destructive effect on shale gas preservation. （2）“Kaijiang-Liangping”trough，formed by extensional stress provides a favorable location for the formation of deep-water shelf facies shale in the study area. Tectonic movements cause uplift and subsidence of the strata， directly affecting the thermal evolution of organic matter within the shale. The primary hydrocarbon expulsion period occurred during Jurassic，while the main gas generation phase was the early period of Middle Jurassic-Early Cretaceous.（3）The micro-fractures and nano-scale pores formed by tectonic activity provide storage space for shale gas. The reticular fracture system matches the direction of the maximum horizontal principal stress，effectively improving the physical properties of shale and facilitating the migration and enrichment of shale gas. Faults are the main channels for the escape of shale gas，and the preservation of shale gas is mainly affected by level Ⅰ faults. The deployment of well locations should be at least 1.5 km away from level I faults.（4）Tectonic activity has an important impact on the generation，storage，and preservation of shale gas，and“moderate structural transformation，effective reticular fractures，and complete sealing system”are the key factors for shale gas reservoir formation. Nanya syncline area is a favorable area for shale gas exploration in eastern Sichuan Basin.

Key words: shale gas, structural control hydrocarbon accumulation, barrier-type fold belts, “Kaijiang-Liangping” trough, deep-water shelf facies, reticular fracture, Wujiaping Formation, Permian, Nanya area, eastern Sichuan Basin

CLC Number: 

  • TE122
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