Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (9): 1324-1333.doi: 10.11764/j.issn.1672-1926.2021.03.011

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Lithofacies and paleogeography of the lower Canglangpu Formation of the Lower Cambrian in Sichuan Basin and its periphery

Shiyu MA(),Wuren XIE,Wei YANG,Shufu DUAN,Zecheng WANG,Saijun WU,Nan SU,Cuiguo HAO,Xiaodan WANG   

  1. Research Institute of Petroleum Exploration and Development,Beijing 100083,China
  • Received:2020-12-09 Revised:2021-03-16 Online:2021-09-10 Published:2021-09-14
  • Supported by:
    The National Science and Technology Major Projects of China(2016ZX05004-001)

Abstract:

Risk exploration Wells JT1,PT1 and CS1 in the center-north of Sichuan Basin encountered thick oolitic dolomite in the Lower Cambrian Canglangpu Formation,and the logging interpretation of the gas reservoir was up to 17 m,which proves that the Canglangpu Formation in the basin has high-quality beach facies dolomite reservoir and can form gas reservoir. In order to determine the distribution of granular beach, it is necessary to study the strata and the lithofacies-paleogeography of Canglangpu Formation,particular the lower part. Based on the data statistics of drilling, field section and regional geological survey, the systematic single factor maps are compiled. The lower segment deposition is partially affected by Deyang-Anyue rift subsidence.There are six sedimentary facies in the lower part of Canglangpu Formation,which are delta facies,clastic tidal flat facies, platform depression facies,carbonate plateau facies,slope facies and basin facies.The most favorable reservoir facies belt in the lower part is the high energy grain beach subfacies in the carbonate plateau facies, which are mainly developed in the north-center of Sichuan Basin.Through the early and late Caledonian movement, the north-center of Sichuan Basin is the most favorable exploration area with the conditions to form high-quality reservoir.

Key words: Sichuan Basin, Lower Cambrian, Lower Canglangpu Formation, Lithofacies and paleogeography

CLC Number: 

  • TE121.3+4

Fig.1

Residual thickness contour map of Canglangpu Formation for Sichuan Basin and its periphery"

Fig.2

Profile of Canglangpu Formation cross Wells ZY1-GS17-GS1?MX11-GT2-WT1-LT1"

Fig.3

Thickness contour map of carbonate rock of lower Canglangpu Formation for Sichuan Basin and its periphery"

Fig.4

Typical lithofacies paleogeographic characteristics of the lower Canglangpu Formation in Sichuan Basin"

Fig.5

Thickness contour map of clastic rock of lower Canglangpu Formation for Sichuan Basin and its periphery表1 四川盆地沧浪铺组下段岩相古地理单因素定量分析"

"

岩相单因素三角洲相碎屑潮坪相台洼碳酸盐岩台地斜坡盆地
地层厚度100~175 m>125 m<125 m
砂砾岩>5%
碎屑岩>95%>80%,>75 m>80%20%~60%0~60%100%
碳酸盐岩<20%<20%,<25 m40%~80%,>25 m<40%0%
鲕粒灰岩0~60 m
白云岩0~60 m
泥晶灰岩0~100 m0~60 m

Fig.6

Contour map of carbonate rocks content of Lower Canglangpu Formation for Sichuan Basin and its periphery"

Fig.7

Thickness contour map of olitic limestone of lower Canglangpu Formation for Sichuan Basin and its periphery"

Fig.8

Thickness contour map of dolomite of lower Canglangpu Formation for Sichuan Basin and its periphery"

Fig.9

Lithofacies-paleogeographic map of lower Canglangpu Formation for Sichuan Basin and its periphery"

Fig.10

Pre-depositional palaeogeomorphic map of lower Canglangpu Formation for Sichuan Basin"

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