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The coupling of dynamics and permeability in the hydrocarbon accumulation period controls the oil-bearing potential of low permeability reservoirs:a case study of the low permeability turbidite reservoirs in the middle part of the third member of Shahejie

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Petroleum Science 2016年第2期13卷 204-224页

作者： Tian Yang Ying-Chang Cao Yan-Zhong Wang Henrik Friis beyene girma haile Ke-Lai Xi Hui-Na Zhang School of Geosciences China University of PetroleumQingdao 266580 Shandong China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071 China Department of Geoscience Aarhus University Hoegh-Guldbergs Gade 2 8000 Aarhus C Denmark Department of Geosciences University of OsloP.O. Box 1047 Blindern 0316 Oslo Norway

The relationships between permeability and dynamics in hydrocarbon accumulation determine oil- bearing potential （the potential oil charge） of low perme- ability reservoirs. The evolution of porosity and permeability of low permeability turbidite reservoirs of the middle part of the third member of the Shahejie Formation in the Dongying Sag has been investigated by detailed core descriptions, thin section analyses, fluid inclusion analyses, carbon and oxygen isotope analyses, mercury injection, porosity and permeability testing, and basin modeling. The cutoff values for the permeability of the reservoirs in the accumulation period were calculated after detailing the accumulation dynamics and reservoir pore structures, then the distribution pattern of the oil-bearing potential of reservoirs controlled by the matching relationship between dynamics and permeability during the accumulation period were summarized. On the basis of the observed diagenetic features and with regard to the paragenetic sequences, the reservoirs can be subdivided into four types of diagenetic facies. The reservoirs experienced two periods of hydro- carbon accumulation. In the early accumulation period, the reservoirs except for diagenetic facies A had middle to high permeability ranging from 10 × 10-3 gm2 to 4207 × 10-3 lain2. In the later accumulation period, the reservoirs except for diagenetic facies C had low permeability ranging from 0.015 × 10-3 gm2 to 62× 10-3 -3m2. In the early accumulation period, the fluid pressure increased by the hydrocarbon generation was 1.4-11.3 MPa with an average value of 5.1 MPa, and a surplus pressure of 1.8-12.6 MPa with an average value of 6.3 MPa. In the later accumulation period, the fluid pressure increased by the hydrocarbon generation process was 0.7-12.7 MPa with an average value of 5.36 MPa and a surplus pressure of 1.3-16.2 MPa with an average value of 6.5 MPa. Even though different types of reservoirs exist, all can form hydrocarbon accumulations i

关键词： Reservoir porosity and permeabilityevolution Accumulation dynamics Cutoff-values ofpermeability in the accumulation period Oil-bearingpotential Low permeability reservoir The third memberof the Shahejie Formation Dongying Sag

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Diagnostic significance of complete blood cell count and hemogramderived markers for neonatal sepsis at Southwest Public Hospitals,Ethiopia

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World Journal of Clinical Pediatrics 2024年第2期13卷 114-126页

作者： Dereje Abebe Regassa Rahel Shumi Nagaash Bisirat Fikadu Habtu Woyesa beyene haile Department of Medical Laboratory Sciences Wolkite UniversityWolkite 11330Ethiopia Department of Medical Laboratory Sciences Dire Dawa UniversityDire Dawa 3000Ethiopia

BACKGROUND Neonatal sepsis is defined as an infection-related condition characterized by signs and symptoms of bacteremia within the first month of *** is the leading cause of mortality and morbidity among *** several studies have been conducted in other parts of world to assess the usefulness of complete blood count parameters and hemogram-derived markers as early screening tools for neonatal sepsis,the associations between sepsis and its complications with these blood parameters are still being investigated in our setting and are not yet part of routine *** To evaluate the diagnostic significance of complete blood cell count hemogramderived novel markers for neonatal sepsis among neonates attending public hospitals in the southwest region of Oromia,Ethiopia,through a case control *** A case control study was conducted from October 2021 to October 2023 Sociodemographic,clinical history,and laboratory test results data were collected using structured *** collected data were entered into Epi-data 3.1 version and exported to SPSS-25 for ***-square,independent sample ttest,and receiver operator characteristics curve of curve were used for analysis.A P-value of less than 0.05 was considered statistically *** In this study,significant increases were observed in the following values in the case group compared to the control group:In white blood cell(WBC)count,neutrophils,monocyte,mean platelet volume(MPV),neutrophils to lymphocyte ratio,monocyte to lymphocyte ratio(MLR),red blood cell width to platelet count ratio(RPR),red blood width coefficient variation,MPV to RPR,and platelet to lymphocyte *** MLR,a cut-off value of≥0.26 was found,with a sensitivity of 68%,a specificity of 95%,a positive predictive value(PPV)of 93.2%,and a negative predictive value(NPV)of 74.8%.The area under the curve(AUC)was 0.828(P<0.001).For WBC,a cutoff value of≥11.42 was identified,with a sensitivity of 55%,a s

关键词： Complete blood count Hemogram-derived marker Neonate Sepsis Ethiopia

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Platelet indices as predictors of poor glucoregulation in type 2 diabetes mellitus adults at Bishoftu General Hospital,Ethiopia

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World Journal of Diabetes 2024年第9期15卷 1889-1902页

作者： Dereje Abebe Regassa Gebeyaw Arega Berihun Bisrat Fikadu Habtu Woyesa beyene haile Rahel Shumi Nagaash Girum Tesfaye Kiya Department of Medical Laboratory Sciences Wolkite UniversityWolkite 11330Ethiopia School of Medical Laboratory Sciences Jimma UniversityJimma 47Ethiopia Department of Medical Laboratory Sciences Dire Dawa UniversityDire Dawa 3000Ethiopia

BACKGROUND Diabetes is a chronic metabolic syndrome that has become a global public health problem with significant morbidity and *** is a pro-inflammatory and pro-thrombotic condition characterized by increased platelet activation and alterations in platelet ***,the use of platelet indices as predictors of poor glucoregulation has not been fully evaluated in this context,and evidence for their role as predictors of poor glycemic status in diabetic patients is *** To evaluate platelet indices and determine their prognostic significance in relation to inadequate glucoregulation among individuals diagnosed with type 2 diabetes at Bishoftu General Hospital in Ethiopia,from June 15 to August 12,*** A comparative cross-sectional study was conducted in 261 participants including 174 individuals with type 2 diabetes mellitus(T2DM)and 87 non-diabetic *** systematic random sampling technique was used to select *** were collected using structured questionnaires,physical measurements,checklists,and laboratory *** parameters and fasting blood glucose levels were determined from blood samples using Sysmex-XN550 and CobasC311 analyzers,*** hematology analyzer output was checked and participants were also screened for malaria parasites using a prepared blood *** data were entered into Epi-data version 3.1 and exported to SPSS version 25 for ***χ2 test,Mann-Whitney U test,Kruskal-Wallis test,post hoc test,Spearman correlation,and receiver operating characteristic curve were used for analysis.A P value<0.05 was considered statistically *** The results of our study indicate that diabetic patients have significantly higher levels of platelet distribution width(PDW),mean platelet volume(MPV),platelet large cell ratio(PLCR),and plateletcrit(PCT)compared to healthy individuals(P<0.001).Furthermore,these indices were found to be significantly elevated in individuals wi

关键词： Platelet indices Type 2 diabetes mellitus Controls Adult Ethiopia

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低渗透储集层成岩作用与孔渗演化——以准噶尔盆地中部1区侏罗系三工河组为例

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石油勘探与开发 2015年第4期42卷 434-443页

作者：葸克来操应长王艳忠 haile beyene girma 张响响张江华金杰华中国石油大学地球科学与技术学院挪威奥斯陆大学地球科学学院中国石油勘探开发研究院中国石化胜利油田分公司新春采油厂

综合利用岩心观察、薄片鉴定、阴极发光分析、扫描电镜观察、流体包裹体分析、碳氧同位素组成分析、压汞分析及孔渗测试等技术方法,结合埋藏演化史、有机质热演化史和油气充注史,研究准噶尔盆地中部1区侏罗系三工河组低渗透储集层成岩... 详细信息

综合利用岩心观察、薄片鉴定、阴极发光分析、扫描电镜观察、流体包裹体分析、碳氧同位素组成分析、压汞分析及孔渗测试等技术方法,结合埋藏演化史、有机质热演化史和油气充注史,研究准噶尔盆地中部1区侏罗系三工河组低渗透储集层成岩作用与孔渗演化,并分析孔渗演化史与油气成藏史的匹配关系。该区低渗透储集层成岩环境经历了早期碱性、中期酸性和晚期碱性的演化过程,主要的胶结溶解序列为:绿泥石膜沉淀,早期方解石胶结,长石溶蚀、石英次生加大、自生高岭石充填,硬石膏胶结,晚期铁方解石胶结、晚期铁白云石胶结,少量黄铁矿胶结,其中压实作用贯穿于整个埋藏演化过程。孔渗演化史与成藏史匹配关系表明,三工河组存在3种成因类型的低渗透储集层:"先成藏后致密"型,勘探潜力最大;"边成藏边致密"型,勘探潜力中等;"先致密后成藏"型,勘探潜力较差。

关键词：低渗透储集层成岩作用孔渗演化史油气成藏史准噶尔盆地

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Hydrothermally induced diagenesis: Evidence from shallow marinedeltaic sediments, WilhelmØya, Svalbard

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Geoscience Frontiers 2019年第2期10卷 629-649页

作者： beyene G.haile Urszula Czarniecka Kelai Xi Aleksandra Smyrak-Sikora Jens Jahren Alvar Braathen Helge Hellevang Department of Geosciences University of Oslo Institute of Geological Sciences Polish Academy of Sciences School of Geosciences China University of Petroleum The University Centre in Svalbard (UNIS)

Sedimentary basins containing igneous intrusions within sedimentary reservoir units represent an important risk in petroleum exploration. The Upper Triassic to Lower Jurassic sediments at Wilhelm?ya(Svalbard) contains reservoir heterogeneity as a result of sill emplacement and represent a unique case study to better understand the effect of magmatic intrusions on the general burial diagenesis of siliciclastic sediments. Sills develop contact metamorphic aureoles by conduction as presented in many earlier studies. However, there is significant impact of localized hydrothermal circulation systems affecting reservoir sediments at considerable distance from the sill intrusions. Dolerite sill intrusions in the studied area are of limited vertical extent(～12 m thick), but created localized hydrothermal convection cells affecting sediments at considerable distance(more than five times the thickness of the sill)from the intrusions. We present evidence that the sedimentary sequence can be divided into two units:(1) the bulk poorly lithified sediment with a maximum burial temperature much lower than 60-70 ℃,and(2) thinner intervals outside the contact zone that have experienced hydrothermal temperatures(around 140 ℃). The main diagenetic alteration associated with normal burial diagenesis is minor mechanical plastic deformation of ductile grains such as mica. Mineral grain contacts show no evidence of pressure dissolution and the vitrinite reflectance suggests a maximum temperature of ～40 ℃. Contrary to this, part of the sediment, preferentially along calcite cemented flow baffles, show evidence of hydrothermal alteration. These hydrothermally altered sediment sections are characterized by recrystallized carbonate cemented intervals. Further, the hydrothermal solutions have resulted in localized sericitization(illitization) of feldspars, albitization of both K-feldspar and plagioclase and the formation of fibrous illite nucleated on kaolinite. These observations suggest hydro

关键词： Diagenesis Sill intrusions Hydrothermal convection cells Carbonate cement Sericitization of feldspars

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