CHARACTERISTICS OF VALLEY-SLOPE BREAK ZONE IN THE WESTERN CIRCLE OF THE BOZHONG DEPRESSION AND ITS CONTROL OVER RESERVOIR DISTRIBUTION

2011 ◽  
Vol 31 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Shengbing HUANG ◽  
Jiaren YE ◽  
Hongtao ZHU ◽  
Xianghua YANG ◽  
Gang WEI
Keyword(s):  
Valley Slope ◽  
Break Zone ◽  
Bozhong Depression

scholarly journals The Sedimentary Facies and Evolution Characteristics of the Middle and Deep Strata in the Nanpu No. 3 Structural Area

2021 ◽  
Vol 9 ◽  
Author(s):  
Hui Zhang ◽  
Zhiqin Lan ◽  
Xiaoyan Li ◽  
Xinglong Huang
Keyword(s):  
Shallow Lake ◽  
Oil And Gas ◽  
Sedimentary Facies ◽  
Seismic Profile ◽  
Tectonic Activity ◽  
Lake Basin ◽  
Braided River ◽  
Break Zone ◽  
Sedimentary System ◽  
Deep Strata

In this study, due to the inconsistencies in the understanding of the sedimentary types in the second section of the Dongying Formation (Ed2) and the third section of the Shahejie Formation (Es3) in the middle and deep strata of Nanpu No. 3 structural area, the depositional characteristics of the deep braided river delta, fan delta, deep-water slump turbidite fan, and coastal and shallow lake in the Nanpu No. 3 structural area were examined in-depth. The investigations were begun based on the descriptions and observations of core samples obtained from eight cored wells in the study area, in combination with seismic, well logging, and rock ore data. The results revealed that the sources of the material in the study area originated from the Shaleitian salient in the southwest direction. It was determined that the fan deltas and the shallow lake sedimentary system had developed during the SQ1 sequence and SQ2 sequence periods. The braided river deltas and the shallow lake and turbidite sedimentary system with multi-stage superposition had developed during the SQ3 to SQ7 sequence periods, and their distribution range had been controlled by the structural background of the gentle slope zone of the lake basin. On that basis, a sequence deposition filling model controlled by a slope break zone in the middle and deep strata of the Nanpu No. 3 structural area was established in this study starting from the typical seismic profile, in which such factors as the tectonic activity characteristics, lake basin boundary shape, water depths, and so on, were comprehensively considered. The goal of this research investigation was to provide beneficial information for oil and gas explorations in similar areas.

scholarly journals Original Sedimentary Pattern of an Inverted Basin: A Case Study from the Bozhong Depression, Offshore Bohai Bay Basin

2016 ◽  
Vol 90 (6) ◽  
pp. 2163-2181 ◽  
Author(s):  
Junfeng ZHAO ◽  
Chiyang LIU ◽  
Lei HUANG ◽  
Nigel MOUNTNEY ◽  
Shaojia HAN ◽  
...  
Keyword(s):  
Bohai Bay ◽  
Bohai Bay Basin ◽  
Bozhong Depression

scholarly journals Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Gang Luo ◽  
Yutian Zhong ◽  
Yuanxiang Yang
Keyword(s):  
Failure Mechanism ◽  
Power Transmission ◽  
Heavy Precipitation ◽  
Mitigation Strategies ◽  
Mitigation Measures ◽  
Hydropower Station ◽  
Residual Soil ◽  
Valley Slope ◽  
Jinping I Hydropower Station ◽  
The Stability

On August 29 and 30, 2012, local extreme rainfalls struck the construction area of the Jinping I Hydropower Station, Xichang, China, and triggered many geohazards. The upper region of the left valley slope 200 m downstream of the dam failed and slid, exposing the D-pile of the G1002 electricity pylon and threatening the entire power transmission line. Therefore, guaranteeing the stability of the residual soil masses in the rear area of the main scarp and the safety of the G1002 electricity pylon became a primary emergency task. Geological field surveys, topographical mapping, study of the failure mechanisms, and stability evaluations were carried out from October 12, 2012, to November 7, 2013. It is revealed that the failure mechanism of the G1002 electricity pylon landslide is flood-induced tractive sliding along the interlayer between the colluvium and the bedrock, significantly influenced by heavy precipitation and frequent blasting activities during the dam construction. The residual soil masses around the G1002 electricity pylon foundation are unstable under rainfall conditions. In order to ensure the stability of the residual soil masses and pylon foundation, a mitigation measure of the anchor cables combined with lattice frame beams was proposed and applied in practice. This paper provides insights into the problems associated with the selection of the locations of electricity pylons in ravine regions as well as mitigation strategies for similar landslides.

Study on Slope Instability Disciplinarian on the Condition of Rainfall

2013 ◽  
Vol 353-356 ◽  
pp. 654-658
Author(s):  
Nan Tong Zhang ◽  
Xiao Chun Zhang ◽  
Hua Rong Wang ◽  
Chen Yan
Keyword(s):  
Slope Stability ◽  
Tensile Stress ◽  
Rainfall Intensity ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Road Construction ◽  
Slope Instability ◽  
Slope Surface ◽  
Large Area ◽  
Break Zone

Slope stability is one of the problems of road construction which should be faced with and solve. Rainfall can reduce the shear strength of slope soil and raise the underground water level which can lead to increase slope soil pore water pressure. The influence of rainfall infiltration on slop is mainly to change the slope seepage field, increase dynamic and hydrostatic water load on the slope soil and decrease of soil shear parameters. More abundant rainfall of typhoon area could make the road slope stability more fragile. Based on Matoushan Mountain along 104 state roads in Taizhou city, Zhejiang province, slope instability disciplinarian on the condition of rainfall is studied using the method of numerical simulation in this paper. As the results, when the rainfall intensity was 0.006 m/h and continuous rain was in 24 hours, the slope surface compressive stress tends to zero which began to appear tensile stress area on the condition of self-weight. And when the rainfall intensity was 0.01 m/h and continuous rain was in 24 hours, the large area of the slope surface was tensile stress area which means to appear break zone in slope surface and likely to landslide at the same time.

scholarly journals Some constraints on the severity of landslide penetration in sensitive deposits

2011 ◽  
Vol 35 (3) ◽  
pp. 301-316 ◽  
Author(s):  
M. A. Carson ◽  
Ginette Lajoie
Keyword(s):  
Case Studies ◽  
Muddy Sediment ◽  
Valley Slope ◽  
Slide Mass ◽  
Topographic Attributes ◽  
Undrained Strength ◽  
First Time ◽  
Theoretical Considerations ◽  
Landslide Retrogression

Theoretical considerations and case-studies are presented to show that, in many cases, the severity of retrogression of an unstable valley slope, in areas of sensitive muddy sediment, is controlled by the topography of the valley. A formula is offered to predict the distance of retrogression from topographic attributes of valleys. It is suggested that most retrogressive landslides in sensitive sediments involve only limited liquefaction of the spoil, and it is for this reason that retrogression is controlled by this topographic constraint. Those situations in which retrogression stops before this limit is reached are also discussed: one important factor which can determine whether or not such aborted retrogression will occur appears to be the nature of the first-time slide. Those situations in which retrogression can exceed this topographic limit are briefly examined as well: attention is focussed on the importance of spoil liquefaction as a prerequisite for such excess landslide retrogression. Data are presented which indicate that the initial undrained strength of the sediment exerts a major control on the degree of spoil liquefaction. Finally the possibility is considered that some assumed retrogressive failures were in fact flake slides in which the slide mass disintegrated after failure. Such 'retrogressive facsimiles' are considered to be rare.

Structural Style in Gentle Slope and its Control Action for Sedimentary and Reservoir Formation of Chenjiazhuang Area in Jiyang Depression for Case

2011 ◽  
Vol 187 ◽  
pp. 84-91
Author(s):  
Zhen Feng Fan ◽  
Jin Liang Zhang ◽  
Xiao Lin Liu ◽  
Jin Kai Wang
Keyword(s):  
Large Scale ◽  
Controlling Factors ◽  
Control Action ◽  
Jiyang Depression ◽  
Gentle Slope ◽  
Structural Style ◽  
Break Zone ◽  
Combining Methods

Haft-graben fault basin often have large-scale gentle slope, and the zone of structural style, sedimentary types and forming factor has its unique characteristics. This paper takes Chenjiazhuang area in Jiyang depression for example. By constructing, deposition and accumulation of combining methods Chenjiazhuang area can be divided into three major tectonic units, witch are upliftt zone, slope zone and structural slope-break zone. Different tectonic units develop different sedimentary and reservoir types, and the accumulation controlling factors are also larger differences.

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