کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8908958 | 1637129 | 2018 | 43 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geochemical and geological characterization of marine-continental transitional shales from Longtan Formation in Yangtze area, South China
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کلمات کلیدی
Gas chromatograph–mass spectrometryFE-SEMHydrocarbon indexTOCillite/smectiteOEPtmaxCPILongtan FormationGC–MS - GC-MSflame ionization detector - آشکارساز یونیزاسیون شعلهEnergy information administration - اداره اطلاعات انرژیI/S - استHIC - اینEIA - اینVitrinite reflectance - بازتاب ویترونیFormation - تشکیلIntraparticle - داخل قطعهFID - درPristane - سرزمینCarbon preference index - شاخص اولویت کربنHydrogen index - شاخص هیدروژنPhytane - فیتانorganic matter - ماده آلیField emission scanning electron microscopy - میکروسکوپ الکترونی منتشر کننده انتشار میدانX–ray diffraction - پراش اشعه ایکسXRD - پراش اشعه ایکسOrganic geochemistry - ژئوشیمی ارگانیکTotal organic carbon - کل کربن آلیShale gas - گاز شیل
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Although previous research has provided useful insights into unconventional shale gas resources in recent years, the geochemical and geological characteristics of marine-continental transitional shale have not been studied systematically. During the Late Permian, Longtan Formation shales were widely deposited in the Yangtze area of South China. These shales clearly indicate the need to deepen our understanding of marine-continental transitional shales. This study describes the various characteristics of black shales from the Longtan Formation in this area on the basis of a field investigation and relevant laboratory analyses. Longtan shale reservoirs, with a thickness and burial depth range of 20-650 and 800-2400â¯m, respectively, are usually interbedded with coal and compact sandstone reservoirs due to their special sedimentary environment. Geochemical analysis of the samples of Longtan shales from seven wells in the Yangtze area indicates the presence of high organic matters (OMs), with a total organic carbon content in the range of 0.85%-35.7% (average of 7.33%) but low hydrocarbon genetic potential (S2) with a value below 3â¯mg HC/g rock. The analysis of carbon isotopes and organic macerals demonstrates that the investigated samples mainly contain type III kerogen. Data from gas chromatography and gas chromatography-mass spectrometry analyses illustrate a weakly oxidizing to a weakly reducing environment, with most organic materials originating from algal-bacterial organisms and terrestrial plants. The terrestrial plants contribute significantly to the OM. The Longtan shales are thermally over-matured, and they have entered the dry-gas generation window according to Ro, production index data, and biomarker maturity ratios. X-ray diffraction analyses show that the content of brittle minerals of the Longtan shales is generally lower than that of marine shales in North America. The Longtan shales show a high clay content averaging 60.32â¯wt% and low calcite mineral content averaging 3.73â¯wt%. Field emission scanning electron microscopy shows that various types of nanometer-to micrometer-scale pores, including interparticle and intraparticle pores, OM pores, and microfractures, are well developed in the shales. Generally, high OM abundance, thermal evolution degree, clay mineral content, and pore space (porosity of 0.56%-10.6%) positively influence shale gas content (1.0%-3.8%). However, high clay content and variable reservoir thickness hinder the successful production of shale gas.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine and Petroleum Geology - Volume 96, September 2018, Pages 1-15
Journal: Marine and Petroleum Geology - Volume 96, September 2018, Pages 1-15
نویسندگان
Jizhen Zhang, Xianqing Li, Xueqing Zhang, Min Zhang, Gangshi Cong, Guangwu Zhang, Feiyu Wang,