川中地区寒武系沧浪铺组沉积特征

doi:10.12108/yxyqc.20220602

Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 19-31.doi: 10.12108/yxyqc.20220602

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Sedimentary characteristics of Cambrian Canglangpu Formation in central Sichuan Basin

WANG Liang¹, SU Shute¹, MA Zike², PU Jing², YAO Linfang¹, LIU Yu¹, LUO Yang¹

1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
2. Central Sichuan Oil and Gas Mine, PetroChina Southwest Oil and Gas Field Company, Suining 629000, Sichuan, China

Received:2022-03-13 Revised:2022-05-04 Online:2022-11-01 Published:2022-11-09

Abstract

Abstract: Based on the regional structural characteristics，field outcrops，drilling and logging data，the sedimentary characteristics of Cambrian Canglangpu Formation in central Sichuan Basin were studied，the paleosedimentary environment was reconstructed，the lateral distribution characteristics of each sedimentary facies were defined， and the favorable reservoir development areas were predicted. The results show that：（1）Deep-water shelf facies are developed in Deyang-Anyue rift trough in central Sichuan Basin，mainly composed of clastic rocks. Shallowwater shelf facies are developed in the areas of Gaomo-Longnusi-north slope to the east of the rift trough，which can be divided into three sedimentary sub-facies. The lithologies of carbonate shallow-water shelf facies are mainly finely crystalline limestone and finely crystalline dolomite， followed by grainstone and granular dolomite. Archaeocyatha and brachiopods can be observed，and the gamma and resistivity logs are in a box shape. The lithologies of debris shallow-water shelf facies are mainly siltstone or sandy mudstone with the gamma and resistivity logs bell or funnel-shaped. The mixed shallow-water shelf is interbedded with sandy dolomite，sandy limestone and mudstone with the gamma and resistivity logs toothed.（2）The sedimentary palaeogeomorphology pattern of Canglangpu Formation is high in the west and low in the east. The water body gradually deepened from west to east，and the stratum thickness gradually increased. The lower sub-member of the first member of Canglangpu Formation in Gaomo-Longnvsi-north slope area is mainly mixed shallow-water shelf facies，the upper sub-member of the first member of Canglangpu Formation is mainly carbonate shallow-water shelf facies， and the second member of Canglangpu Formation is mainly debris shallow-water shelf facies.（3）The sedimentary facies of Canglangpu Formation in the study area control the development of high-quality reservoirs. The reservoir mainly develops in the carbonate shallow-water shelf of the upper sub-member of the first member of Canglangpu Formation. The granular shoal is the most favorable sedimentary microfacies，among which dolomite reservoir is the best， followed by limestone. On the plane, high-quality reservoirs mainly develop along the high part of the structure at the edge of Deyang-Anyue rift trough， showing a banded distribution.

Key words: Deyang-Anyue rift trough, shallow-water shelf, shoal, dolomite reservoir, sedimentary features, Canglangpu Formation, Cambrian, central Sichuan Basin

CLC Number:

TE122.2

WANG Liang, SU Shute, MA Zike, PU Jing, YAO Linfang, LIU Yu, LUO Yang. Sedimentary characteristics of Cambrian Canglangpu Formation in central Sichuan Basin[J].Lithologic Reservoirs, 2022, 34(6): 19-31.

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Sedimentary characteristics of Cambrian Canglangpu Formation in central Sichuan Basin

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