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Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

International Journal of Geosciences 2012年第4期3卷 780-789页

作者： Pouyon Dieudonné Epada Ganno Sylvestre Tabod Charles Tabod University of Yaoundé I University of Yaounde I National Civil Engineering Laboratory

Geophysical and geotechnical surveys were conducted in the Western Cameroon (Kekem area) following a landslide on argillaceous material in order to understand the triggering processes and mechanisms of this landslide and to assess the stability of the slope. The geophysical soundings consisting of vertical electrical soundings with the Schlumberger electrode array configuration were carried out to monitor the behaviour of electrical resistivity in the landslide. Geoelectrical data showed a zone of low resistivity values identified as a clayey sand-filled aquifer. This aquifer played an important role in the triggering process of the landslide. Geotechnical soundings showed that the aquifer had a thickness of 7.0 m. The depth from the landslide crest level to the failure surface reached 3.0 m and 20.6 m. Laboratory tests were then carried out in order to evaluate the cohesion of the soil and the angle of internal friction, and to calculate the safety factor in view of making a stability analysis. The laboratory results exhibited a soil with low consistency, almost doughy. The mean value of the safety factor (1.4) been lower than the slope stability coefficient (1.5), revealed that the slope is unstable, likely to know at any moment a reactivation of the slide. This study showed that electrical soundings coupled with geotechnical surveys are useful tools for the characterization of landslides.

关键词： Landslide Resistivity argillaceous Material Basal Undercutting Kekem Cameroon

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A Fine Investigation on Geological Conditions for Oil Accumulation in the Paleogene Intersalt Shale Series in the Qianjiang Depression

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Open Journal of Yangtze Oil and Gas 2019年第4期4卷 301-312页

作者： Xiaolong Ju Junjun Shen Shourui Zhong Weihao Zhang Jiaqi Liu Fansong Wei College of Geophysics and Petroleum Resources Yangtze UniversityWuhanChina Hubei Cooperative Innovation Center of Unconventional Oil and Gas of Yangtze University WuhanChina

This study dealt with the rhythmic Qian 3410 of the intersalt shale series in the Qianjiang Depression,in which the geological condition for oil accumulation in the rhythmic shale was investigated by using the basic drilling,core and well logging data,as well as data obtained from the thin section identification,SEM,mercury injection,X-ray diffraction and rock freezing heat *** study result indicated that:1)the intersalt shale series are characterized by TOC in a range of 0.35%-6.38%(averaging 3.19%),Types I and II1 organic matter,and from immature to mature oil,indicative of a potential for generating a great volume of immature oil;2)in the target layer,mineral compositions are complicated,which can divide into argillaceous dolomite facies,argillaceous limestone facies,dolomitic mudstone facies,and calcium-mirabilite-filling dolomitic mudstone facies;and 3)of them,the argillaceous dolomite facies is the most contributory,with reservoir spaces consisting of intergranular pores as dominant,as well as rare dissolution pores and *** is characterized by high organic abundance(4.23%-6.38%),high content of brittle mineral(50%-71%),low content of clay mineral(18%-33%),high porosity(10.8%-26.3%)and good oil-bearing properties(S1 distributed in 3.48-5.64 mg/g,and S1/TOC value in a range of 348-564 oil mg/g).Therefore,the argillaceous dolomite facies was considered the key target series to be explored for the intersalt shale oil in the study area in the coming days.

关键词： Qianjiang Depression Intersalt Shale Series Geological Conditions for Hydrocarbon Accumulation Unmature Oil argillaceous Dolomite Source Rock Target Series

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Seismic event, sequence and tectonic significance in Canglangpu Stage in Paleo-Tanlu Fault Zone

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Science China Earth Sciences 2002年第9期45卷 781-791页

作者：乔秀夫高林志彭阳李海兵 Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China School of Earth and Space Sciences Peking University Beijing 100871 China

The Canglangpu Stage of Lower Cambrian Series is widely distributed along both sides of the Tanlu (Tancheng-Lujiang) Fault Zone in the Jiao-Liao-Xu-Huai regions. In the Liaodong Peninsula, the Canglangpu Stage consists of three formations, i.e. Gejiatun, Dalinzi and Jianchang formations in ascending order (lying on the eastern side of the Tanlu Fault Zone). The Dalinzi Formation, developing in a littoral Sabkha environment, is full of catastrophic event records of violent seism, such as liquefied muddy-sandy veins, hydroplastic folds, hydroplastic micro-faults (three forming an organic whole), liquefied crinkled deformations, liquefied breccia and sandy dikes. Based on such records, the seismic liquified sequence of argillaceous rocks in Sabkha is built up. In northern Jiangsu and Anhui provinces, however, there hardly observe seismic records in the Canglangpu Stage, which consists of Jinshanzhai and lower Gouhou and upper Gouhou formations (lying on the western side of the Tanlu Fault Zone). Even if the Gouhou Formation, developing in a lagoon-dry environment, is in the same climate zone as the Dalinzi Formation, and 4 depositional sequences have been identified in the Canglangpu Stage in Northern Jiangsu and Anhui provinces, however, in the same stage in the Liaodong Peninsula, there exist only 3 ones. Therefore, it is not supported by the above mentioned evidence (such as catastrophic events, sequences stratigraphy and lithologic correlation of formations) that the Canglangpu Stage in the Liaodong Peninsula came from northern Jiangsu and Anhui provinces through a long-distance, about hundreds kilometers, left-hand displacement of the Tanlu Fault in the Mesozoic era.

关键词： Canglangpu Stage, Dalinzi Formation, Tanlu Fault Zone, catastrophic event of seism, liquefied muddy vein, hydroplastic fold, seismic-liquefied sequence in Sabkha argillaceous rocks.

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A Sand Control System for Light Oil Reservoir

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China Oil & Gas 1996年第1期3卷 42-42页

作者： Xiang Yuzhang(Xinjiang Petroleum Administration) Xinjiang Petroleum Administration

ＡＳａｎｄＣｏｎｔｒｏｌＳｙｓｔｅｍｆｏｒＬｉｇｈｔＯｉｌＲｅｓｅｒｖｏｉｒＸｉａｎｇＹｕｚｈａｎｇ（ＸｉｎｊｉａｎｇＰｅｔｒｏｌｅｕｍＡｄｍｉｎｉｓｔｒａｔｉｏｎ）Ｋｅｙｗｏｒｄｓ：Ｓａｎｄｃｏｎｔｒｏｌ，Ｌｉｇｈ... 详细信息

ＡＳａｎｄＣｏｎｔｒｏｌＳｙｓｔｅｍｆｏｒＬｉｇｈｔＯｉｌＲｅｓｅｒｖｏｉｒＸｉａｎｇＹｕｚｈａｎｇ（ＸｉｎｊｉａｎｇＰｅｔｒｏｌｅｕｍＡｄｍｉｎｉｓｔｒａｔｉｏｎ）Ｋｅｙｗｏｒｄｓ：Ｓａｎｄｃｏｎｔｒｏｌ，Ｌｉｇｈｔｃｒｕｄｅｏｉｌ，Ｓａｎｄｓｔｏ...

关键词： Sand control Light crude oil Sandstone argillaceous cement

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