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Experimental Study of the Main Influencing Factors in Mechanical Properties of Conglomerate

Earthquake Research in China 2020年第3期34卷 430-451页

作者： ZHOU Bo GE Hongkui ZHOU Wei WANG Jianbo HAO Hongyong WANG Xiaoqiong LIU Pengyu Research Institute of Experiment and Detection of Xinjiang Oilfield Company Karamay 834000China Xinjiang Laboratory of Petroleum Reserve in Conglomerate Karamay 834000China Unconventional Oil and Gas Technology Research Institute China University of PetroleumBeijing 102249China China University of Petroleum-Beijing At Karamay Karamay 834000China

In recent years,with the success of exploration and development of conglomerate reservoirs in Mahu Depression,Junggar Basin,China,it is urgent to study the mechanical properties and its influencing factors of conglomerate which is considered as a new oil and gas *** on the investigations of petrologic characteristics,heterogeneity and mechanical properties of conglomerate in Baikouquan formation,the content and geometric characteristics of gravel in conglomerate,the main factors in heterogeneity and the mechanical behavior in the triaxial compression experiment of conglomerate are analyzed in this *** results show that the size and content of gravel in conglomerate varies greatly,and conglomerate has strong heterogeneity under the influence of gravel content and *** analysis of mechanical properties of conglomerate shows that conglomerate is characterized by ***,the sphericity is negatively correlated to the gravel content,while the heterogeneity increases with the increase of conglomerate *** to the existence of heterogeneous gravel,local stress may concentrate in conglomerate when the stress is ***,a large number of micro-cracks appear at the edge of gravel,demonstrating the strong plasticity of *** paper is of referential significance to the study of rock mechanical properties and the evaluation of engineering properties in conglomerate development.

关键词： Conglomerate petrological characteristics Heterogeneity Mechanical properties Plasticity

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Study on Reservoir Geological characteristics and Potential Damage Mechanism of FIOC Oilfield in Sargiz

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Open Journal of Yangtze Oil and Gas 2020年第1期5卷 26-34页

作者： Dichen Tan Zhu Zhu Huaiyuan Long Song Wang Haoren Wang College of Chemistry and Environmental Engineering Yangtze University Jingzhou China Sinopec Four Machines and Seiwa Co. Ltd. Jingzhou China

With the in-depth development of the Sargiz oilfield in Kazakhstan, oil layer protection plays an extremely important role in the development process. The petrological characteristics and pore types of the reservoir were analyzed by X-ray diffraction and electron microscopy. The average face ratio of the reservoir was 19.30%. The main pore type was intergranular pore and the face rate was 17.52%. The total amount of clay minerals in the reservoir core is 7% - 10%, and the clay minerals are mainly illite, Yimeng, kaolinite and chlorite;the shale content of the main oil-bearing layer is about 3% - 10%. Refer to relevant industry standards for speed, water, stress, acid, and alkali sensitivity experiments to study the potential damage mechanism of the reservoir. According to the above experiments, the oilfield reservoirs have no speed-sensitive damage and are weakly water-sensitive reservoirs;the reservoirs are highly stress-sensitive and easy to produce sand when the stress changes;they have moderately weak acid sensitivity and weak-medium weak alkaline.

关键词： Sargizblock petrological characteristics Pore characteristics Damage Mechanism Analysis

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A petrological, Geochemical, and Geochronological Study of Shuikou Ultrabasic Rock Mass in Wuding County, Yunnan Province, China

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Open Journal of Geology 2022年第8期12卷 587-612页

作者： Bin Yang Zizheng Wang Qing Zhou Xiaoliang Cui Shengwei Wang Chengdu Center China Geological Survey Chengdu China

Geotectonically, the Shuikou ultrabasic-basic rock mass is located on the western margin of the Yangtze Platform. As revealed by field geological surveys, the Shuikou rock mass intrudes into the quartz sandstones of the Sinian Chengjiang Formation (Zac). It is dominated by pyroxenites and can be roughly divided into four lithofacies zones, namely gabbros at the outermost periphery and fine-, medium-, and coarse-grained pyroxenites from margin to center. With the transition from pyroxenites to gabbros, the Shuikou rock mass features gradual enrichment in silica and alkali overall, an increase in ΣREE and (La/Yb)N ratio, and a decrease in δEu values and Eu/Sm ratio, indicating that the Shuikou rock mass was formed from the continuous differentiation and crystallization of consanguineous magma and that low-degree partial melting occurred meanwhile. According to the U-Pb baddeleyite geochronology, the crystallization age of the Shuikou rock mass is 210.7 ± 3 Ma (MSWD = 1.01). Based on this, as well as the analysis of geochemical characteristics, the Shuikou rock mass occurred in a continental intraplate tensional environment, this is closely related to the activities of the Emeishan mantle plume during the same period.

关键词： Shuikou Rock Mass petrological characteristics Geochemical characteristics Geochronology Wuding County Yunnan Province

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Evolution of pore fluid of low porosity and permeability reservoir in Qinnan Sag:a case study of 29-2 structurein Qinhuangdao area

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Global Geology 2017年第2期20卷 80-88页

作者： XU Simeng PENG Xiaolei LIU Na LIU Li WANG Qingbin LIU Xiaojian JIN Xiaoyan College of Earth Sciences Jilin UniversityChangchun 130061China Tianjin Branch of CNOOC Ltd. Tianjin 300452China

The southeast depression of Qinnan Sag is a potential oil-gas exploration region in the Bohai Sea area. With the analysis of large quantity of rock thin sections,scanning electron microscope and the physical property data of reservoir,the authors studied the petrological characteristics and the evolution of pore and fluid of sandstone in the deeper strata in 29-2 structure in Qinhuangdao area. The results show that the evolutionary tendency of Paleogene sandstone reservoir porous fluid in research area is changed from alkaline porous fluid to acidic porous fluid,and back to alkaline porous fluid. There are three stages of reservoir porous evolution in Qinhuangdao area,namely sharp decrease in porosity due to mechanical compaction,increase in porosity because of corrosion and dissolution,and remarkable reduction owing to carbonate cementation.

关键词： Qinnan Sag Paleogene reservoir petrological characteristics evolution pore fluid

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