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Characteristics and Controlling Factors Analyze of Nearshore Subaqueous Fans in Langgu Depression(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2007年第02期
Page:
145-148,157
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics and Controlling Factors Analyze of Nearshore Subaqueous Fans in Langgu Depression
Author(s):
SONG Rong-cai1; ZHANG Shao-nan1; DONG Shu-yi2; ZHO U Wen1
1. School of Energy Resources, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. School of Geosciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China
Keywords:
Langgu Depression;  nearshore subaqueous fans;  sedimentary characteristics;  controlling factors;  sequence;  Daxing Fault
PACS:
P512.2;TE121.1
DOI:
-
Abstract:
More studies on the characteristics and controlling factors of the glutenites of nearshore subaqueous fans in Langgu depression are required due to the frequent migration in the vertical and landscape orientation, strong anisotropism, and exploration difficulty. After observing 541 m cores in 18 wells, establishing logging sequences of 156 wells, and recognizing 1 km× 1 km seismic phase, the sediment characteristic and controlling factors of this glutenite are analyzed. This glutenite lies in the dark mudstone and the positive circle of progressive sequence. It can be divided into five periods. From the bottom, the thickness reduces and the layer numbers becomes small. It is thought that the formation of nearshore subaqueous fans is under the control of many factors, such as sequence, Daxing faults, palaeotectonics, palaeoclimatologics, palaeotopography, matter supplementation, but the interaction of three factors is crucial function, that is the sequence development, the intense activity of Daxing faults and matter supplementation. The second and third fans are favorable objects in the next exploitation task.

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