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Hydrocarbon fluid inclusions and source rock parameters:A comparison from two dry wells in the western offshore,India

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Geoscience Frontiers 2023年第1期14卷 64-78页

作者： silpa Thankan V.Nandakumar S.Shivapriya National Facility for Geofluids Research and Raman Analysis National Centre for Earth Science StudiesMinistry of Earth SciencesGovernment of IndiaThiruvananthapuram 695011KeralaIndia Department of Geology University of KeralaThiruvananthapuram 695581KeralaIndia

Fluid inclusions represent the direct evidence of paleofluids and can provide valuable information on the evolution of sedimentary basins and oil-bearing *** fluid inclusion(s)(HCFIs)are the vestiges of oil from the geological *** paper delineates the paleotemperature(T_(h))/oil window,the oil quality of HCFIs and Raman peaks corresponding to hydrocarbon species of HCFIs using fluid inclusion techniques,and source rock potential of hydrocarbon generation,thermal maturity,the quantity of organic matter,and the kerogen types obtained through Rock-Eval pyrolysis data from two dry wells RV-1 well of Mumbai offshore and KKD-1A well of Kerala-Konkan *** present study compares the fluid inclusion parameters as well as the source rock geochemical characteristics of these two dry wells to address the scientific problem of the wells going ***,evaluated whether the results agree with an earlier finding from a case study of two wells named KK4C-Al(Kerala-Konkan basin)and RV-1 well where only a few parameters such as temperature of homogenization(T_(h))&API gravity were utilised,and the chances of getting oil in the nearby areas of these two wells were *** the present study,the fluid inclusion parameters such as the palaeotemperature(T_(h)),API Gravity and Raman spectra were obtained from micron sized fluid inclusions at different depths for a quick assessment of nature of oil inclusions within the two dry *** with fluid inclusion parameters,different source rock parameters obtained from Rock-Eval Pyrolysis analysis(secondary data)such as S1,S2,S3,(T_(max)),Hydrogen Index(HI),Oxygen Index(OI),Potential Yield(PY),Production Index(PI)and Total Organic Carbon Content(TOC)were also considered for a detailed source-rock evaluation of two wells(RV-1 and KKD-1A)and the results act as the supporting evidence to address the reason for the wells gone *** of homogenisation(T_(h))of hydrocarbon Fluid Inclusion Assemblages(F

关键词： Hydrocarbon fluid inclusions(HCFIs) Spectroscopic analysis Oil window API gravity Rock-Eval pyrolysis

Utility of fluid inclusion paleo-temperature in petroleum system modelling:A case study from western offshore,India

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Energy Geoscience 2024年第2期5卷 101-119页

作者： V.Nandakumar S.Shivapriya silpa Thankan National Facility for Geofluids Research and Raman Analysis National Centre for Earth Science StudiesMinistry of Earth SciencesGovernment of IndiaThiruvananthapuram695011KeralaIndia Department of Geology Kerala UniversityThiruvananthapuram695581KeralaIndia

The paleo-temperature(Th)data from fluid inclusions are utilized for thermal history modelling using PetroMod ***,bottom hole temperature(BHT)and vitrinite reflectance(Ro)measurements are widely used in petroleum system modelling(PSM)in the oil industry for calibration *** representing the minimum temperature of fluid entrapment estimated from fluid-inclusion study provides extra support to build the thermal models for *** inclusion parameters along with Rock-Eval pyrolysis analysis have been used to predict the maturity of oil in terms of API gravity as well as the maturity of source rocks *** exploratory wells RV-1(Mumbai Offshore Basin)and KK4C-A-1(Kerala-Konkan Offshore Basin),India were examined and the T_(h)from most of the fluid inclusions of wells RV-1 and KK4C-A-1 fell in the oil window range of 60-140℃suggesting thermal conditions favourable for oil generation in both of the wells.T_(h)of coeval aqueous inclusions along with the Hydrocarbon Fluid inclusions(HCFIs)was used to calibrate *** parameters show that source rocks of well RV-1 are mature and that of well KK4C-A-1 are *** sets of PSM are created in terms of generation and expulsion for the dry wells RV-1 and KK4C-A-1 and calibrated each well using fluid inclusion Th and *** the fluid inclusion analysis method,it is evident that hydrocarbon generation happened in both wells and the paleo-temperature indicates that the formations of both wells were subjected to temperatures in the oil window range,even though it was designated as dry wells in the present *** present study highlights the application of fluid inclusion paleo-temperature(Th)during calibration instead of commonly used *** could obtain desirable and accurate data output from PSM using T_(h) calibration.

关键词： Paleo-temperature(T_(h)) Hydrocarbon fluid inclusion Petroleum system modelling Petroleum generation and expulsion Western offshore basin

Risk factors for endophthalmitis after cataract surgery in diabetic patients: a case control study

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 417-423页

作者： Sukhum silpa-archa Apichaya Papirachnart Panisa Singhanetr Janine M Preble Department of Ophthalmology Faculty of Medicine Rajavithi Hospital Rangsit University Wayne State University School of Medicine

AIM: To identify risk factors associated with post-cataract surgery endophthalmitis(PCE) in type 2 diabetic ***: A hospital-based retrospective case-control study was conducted on 194 type 2 diabetic patients undergoing cataract surgery in Rajavithi Hospital from January 2007 to December 2015. Fifteen patients with PCE were included as the case group and 179 patients without PCE were included as the control group. Potential factors associated with PCE among both groups including demographics, pre-operative characteristics, surgical settings and complications, were statistically analyzed using Chi-square testing and a logistic regression ***: Within the case group, 53% were females and the median age was 68 y. Univariate analysis of pre-operative characteristics, surgical settings and complications revealed that recent pre-operative fasting plasma glucose, insulin therapy, presence of diabetic retinopathy, and severe non-proliferative or proliferative diabetic retinopathy were significantly associated with PCE. In a multivariate analysis adjusting for blood glucose level, insulin treatment was the only significant factor associated with an increased risk of PCE(OR 3.9, 95%CI 1.0-15.0, P=0.04) compared to patients without insulin treatment. The most common causative organisms were gram-positive bacteria(89%). Staphylococcus species represented the most common group(67%). Median best corrected visual acuity at 1-month and 3-month follow-up was equal at 0.7 logMAR(20/100).CONCLUSION: The authors identify insulin treatment as the only risk factor associated with endophthalmitis after cataract surgery in type 2 diabetic patients. Further studies with serum levels of pre-operative glycated hemoglobin(HbA_(1c)) and post-operative fasting plasma glucose level are essential to truly demonstrate the role of peri-operative glycemic markers as a risk factor for PCE.

关键词： endophthalmitis cataract surgery diabetic patients insulin fasting plasma glucose

Poor prognostic factors in post-traumatic endophthalmitis following open globe injury

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International Journal of Ophthalmology(English edition) 2020年第12期13卷 1968-1975页

作者： Sukhum silpa-archa Akkaranisorn Dejkong Kwanchanoke Kumsiang Peranut Chotcomwongse Janine M Preble C.Stephen Foster Department of Ophthalmology Faculty of MedicineRajavithi HospitalRangsit UniversityBangkok 10400Thailand Department of Ophthalmology Kresge Eye Institute Wayne State University School of MedicineDetroitMichigan 48201USA Massachusetts Eye Research and Surgery Institution Massachusetts 02451USA Ocular Immunology&Uveitis Foundation WalthamMassachusetts 02451USA Harvard Medical School BostonMassachusetts 02115USAWalthamMassachusetts 02451USABostonMassachusetts 02115USA

AIM:To demonstrate prognostic factors for poor visual outcome in patients with post-traumatic endophthalmitis(PTE)following open globe ***:A retrospective study was conducted on 66 patients(66 eyes)with PTE following open globe injury from 2005 to *** factors accounting for good and poor visual outcome were statistically analyzed by Chisquare test and Logistic regression ***:In 66 cases,39 cases(59%)had a poor visual *** and multivariate Logistic regression analysis identified retained intraocular foreign body(IOFB)as the only factor significantly associated with poor visual outcome[adjusted odds ratio,4.62;95%confidence interval(1.04-20.53);P=0.04].The most common causative agents were gram-positive organisms(83%),of which Bacillus cereus(33%),was the most common *** cases received intravitreal antibiotic *** ciprofloxacin was the most used systemic antibiotic(33%).Pars plana vitrectomy was performed in 83%(55/66)of *** 6 mo follow-up,mean BCVA was 1.74±0.72 log MAR ***:In patients with PTE following open globe injury,the only predictor of poor visual outcome is the presence of *** cereus is the most isolated microorganism.

关键词： post-traumatic endophthalmitis open globe injury intraocular foreign body