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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (5): 789-798.doi: 10.11764/j.issn.1672-1926.2022.01.011

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Tectonic fracture characteristics and formation stages of Longmaxi Formation in Shuanglong-Luochang areas， southern Sichuan Basin

Liqing CHEN1(),Qiuzi WU1,Cunhui FAN2(),Kesu ZHONG1,Xue YANG1,Liang HE1   

  1. 1.Shale Gas Institute of PetroChina Southwest Oil & Gasfield Company，Chengdu 610051，China
    2.School of Geoscience and Technology，Southwest Petroleum University，Chengdu 610500，China
  • Received:2021-08-06 Revised:2022-01-19 Online:2022-05-10 Published:2022-05-12
  • Contact: Cunhui FAN E-mail:chenlq28@petrochina.com.cn;fanchswpi@163.com
  • Supported by:
    The PetroChina Major Engineering Technology Field Test Project(2019F-31-01)

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Abstract:

Longmaxi Formation in Shuanglong-Luochang areas， southern Sichuan Basin is a key area for deep shale gas exploration and development. The development characteristics and formation stages of tectonic fractures have an important influence on shale gas bearing and productivity. By using core， FMI imaging logging， fracture filling fluid inclusion testing， rock acoustic emission experiments and burial thermal evolution history analysis， the development characteristics and formation period of shale structural fractures are comprehensively studied. The study results have shown that the tectonic fractures of Longmaxi Formation are mainly high angle fractures， vertical fractures and composite fractures of tectonic origin. The core fractures have the characteristics of large spacing， small density， large dip angle and high filling degree. The fracture dip angle of imaging logging is consistent with the core， and the extension orientation is mainly near EW， NNE and NWW directions， followed by NNW direction. The core fracture cutting relationship， fracture occurrence matching relationships of imaging logging， fracture filling fluid inclusion testing and rock acoustic emission experiment all confirm that the Longmaxi Formation structural fractures in Shuanglong-Luochang areas underwent more than three periods of tectonic movement transformation. Combined with the analysis of burial-thermal evolution history， it is determined that the formation periods of tectonic fractures are mid-late Yanshan Movement and early Himalayan Movement （78-56 Ma）， middle Himalayan Movement （56-29 Ma） and late Himalayan Movement- present （29-0 Ma）. The homogenization temperatures of the corresponding fluid inclusions are 165-198 ℃， 115-146 ℃ and 74-105 ℃， respectively. Based on the principle of structural geology， genetic mechanism of tectonic fractures in the Longmaxi Formation in Shuanglong-Luochang areas is established.

Key words: Tectonic fracture, Developmental characteristics, Formation stage, Shuanglong-Luochang areas

CLC Number: 

  • TE122.1

Fig.1

Geological map of Shuanglong-Luochang areas in southern Sichuan Basin"

Fig.2

Fault development characteristics and well location of Longmaxi Formation in the study area"

Fig.3

Shale core fracture types and development characteristics of Longmaxi Formation in Shuanglong-Luochang areas"

Fig.4

Fracture development characteristics of Longmaxi Formation shale cores in Shuanglong-Luochang areas"

Fig.5

Results of fracture occurrence identification based on FMI imaging logging"

Fig.6

Cross-cutting relationship of structural fractures in shale cores of Longmaxi Formation in Shuanglong-Luochang areas"

Fig.7

Homogenization temperature test of fluid inclusion in structural fracture filling of shale core of Longmaxi Formation in Shuanglong-Luochang areas"

Fig.8

Corresponding phases of homogenization temperature of filling fluid body inclusions in structural fractures of Longmaxi Formation shale cores in Shuanglong-Luochang areas"

Fig.9

Acoustic emission experiment results of Longmaxi Formation shale core samples from Well N221 in the research area"

Fig.10

Burial-thermal evolution history of Well X1 in the study area"

Fig.11

Structural fracture development model of Longmaxi Formation in Shuanglong-Luochang areas"

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