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Textural Characteristics and Depositional Environment of Ngrayong Sandstone (Middle Miocene) from Rembang Area, Northeast Java, Indonesia

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Open Journal of Geology 2022年第12期12卷 1102-1119页

作者： San Yee Khaing Yuichi Sugai Myo Min Tun Sugeng Sapto Surjono jarot setyowiyoto Department of Geology Kyaing Tong University Kyaing Tong Myanmar Department of Earth Resource Engineering Faculty of Engineering Kyushu University Fukuoka Japan Ministry of Education Office No. 13 Nay Pyi Taw Myanmar Department of Geological Engineering Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia

Granulometric analysis of Ngrayong sandstone samples from Rembang area of NE Java (Indonesia) has been carried out to examine the textural characteristics and elucidate depositional environment. The result data from the grain size analysis indicates that the Ngrayong sediments are classified as sand or muddy sands. They are very fine- to medium-grained (phi values: 1.67 to 3.35), moderately- to well-sorted (standard deviation: 0.19 to 0.57), strongly fine-skewed to strongly coarse-skewed (skewness values: 4.82 to −5.97), and very platykurtic to very leptokurtic (kurtosis values: 0.36 to 2.41). Sandstone samples show unimodal grain size distribution. The sediments are interpreted to be transported in all three modes-traction, saltation and suspension, however, suspension and rolling are the major processes during transportation. Discriminant functions indicate diversity in the depositional environment for the sandstones. However, shallow marine is regarded as the dominant depositional environment. The preponderance of fine-grained sediments and lack of coarse sands suggest low to moderate energy conditions during deposition of Ngrayong sediments.

关键词： Granulometric Analysis Ngrayong Sandstone Rembang Textural Characteristics Depositional Environment

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Facies and Reservoir Characteristics of the Ngrayong Sandstone in the Rembang Area, Northeast Java (Indonesia)

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Open Journal of Geology 2017年第5期7卷 608-620页

作者： San Yee Khaing Sugeng Sapto Surjono jarot setyowiyoto Yuichi Sugai Department of Earth Resource Engineering Faculty of Engineering Kyushu University Fukuoka Japan Geological Engineering Department Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia

The Rembang area is a well-known prospective region for oil and gas exploration in Northeast Java, Indonesia. In this study, the reservoir characteristics of the Ngrayong Sandstone were investigated based on outcrops in the Rembang area. Petrological, mineralogical, petrophysical and sedimentological facies analyses were conducted. These sandstones are grain- and matrix-supported, and composed of very fine to medium, sub-angular to poorly-rounded, moderately- to very well-sorted sand grains. These sandstones are mainly composed of quartz, orthoclase, plagioclase, and micas with minor amounts of clay minerals, and therefore are predominantly classified as sub-lithic arenite and sub-felds pathicarenite. Petrographic observations and grain size data indicate that these sandstones are texturally quite mature, based on their good-sorting and the occurrence of minor amounts of matrix clays. Common clays in the samples include illite, smectite, kaolinite, and gibbsite. The porosity of the Ngrayong sandstones ranges from 25.97% to 40.21%, and the permeability ranges from 94.6 to 3385 millidarcies. Thus, these sandstones exhibit well to excellent reservoir qualities. Eight lithofacies were identified from five measured stratigraphic sections, and are dominated by foreshore and tide-dominated shoreface facies. The Ngrayong sequence shows a single transgressive-regressive cycle. Cross-bedded sandstone and massive sandstone are identified as the most promising potential reservoir facies based on their characteristics in outcrops, their lateral and vertical distributions, their sedimentological characteristics and their petrophysical properties.

关键词： Reservoir Characteristics Facies Analysis Permeability Hydrocarbon Exploration

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Glycemic management in critically ill patients

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World Journal of Surgical Procedures 2016年第3期6卷 30-39页

作者： Eden A Nohra jarot J Guerra Grant V Bochicchio Section of Acute and Critical Care Surgery Department of SurgeryWashington University in St.Louis

Hyperglycemia associated with critical illness,also called "stress hyperglycemia" or "stress diabetes",is a consequence of many pathophysiologic hormonal responses including increased catecholamines,cortisol,glucagon,and growth *** in multiple biochemical pathways result in increased hepatic and peripheral insulin resistance with an uncontrolled activation of gluconeogenesis and *** has a negative impact on the function of the immune system,on the host response to illness or injury,and on infectious and overall *** degree of glucose elevation is associated with increased disease *** randomized controlled trials including the Van den Berghe study,the NICE-SUGAR trial,VISEP and GLUCONTROL have shown that the control of glucose levels in critically ill patients has implications on outcome and that both hyperglycemia and hypoglycemia are detrimental and should be *** variability has also been shown to be *** glucose control strategies have changed due to the concerns of hypoglycemia and therefore intermediate target glucose control strategies are most often *** patient populations may vary with regards to optimal glucose targets,timing and approach for glucose control,and with regards to the prognostic significance of glucose excursions and ***,surgical,and trauma patients may benefit at different rates from glucose control and the approach may need to be adapted to various medical settings and to correspond to the workflow of health *** modifiers for the success of insulin therapy for hyperglycemia include the methods of nutritional supplementation and exogenous glucose *** research is required to improve insulin protocols for glucose control,to further define glucose targets,and to enhance the accuracy of glucose measuring technologies.

关键词： Hyperglycemia Hypoglycemia Critically ill Intensive care unit Glucose control

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