کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4681778 1348873 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Upper Paleozoic coal measures and unconventional natural gas systems of the Ordos Basin, China
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Upper Paleozoic coal measures and unconventional natural gas systems of the Ordos Basin, China
چکیده انگلیسی

Upper Paleozoic coal measures in the Ordos Basin consist of dark mudstone and coal beds and are important source rocks for gas generation. Gas accumulations include coal-bed methane (CBM), tight gas and conventional gas in different structural areas. CBM accumulations are mainly distributed in the marginal area of the Ordos Basin, and are estimated at 3.5 × 1012 m3. Tight gas accumulations exist in the middle part of the Yishan Slope area, previously regarded as the basin-centered gas system and now considered as stratigraphic lithologic gas reservoirs. This paper reviews the characteristics of tight gas accumulations: poor physical properties (porosity < 8%, permeability < 0.85 × 10−3 μm2), abnormal pressure and the absence of well-defined gas water contacts. CBM is a self-generation and self-reservoir, while gas derived from coal measures migrates only for a short distance to accumulate in a tight reservoir and is termed near-generation and near-reservoir. Both CBM and tight gas systems require source rocks with a strong gas generation ability that extends together over wide area. However, the producing area of the two systems may be significantly different.

Figure optionsDownload as PowerPoint slideHighlights
► Coal measure of the Ordos Basin as source rocks for both CBM and tight gas.
► Tight gas has typical characteristics of a modified basin-centered gas model.
► CBM is a self-generation-reservoir whereas tight gas is near-generation-reservoir.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoscience Frontiers - Volume 3, Issue 6, November 2012, Pages 863–873
نویسندگان
, , , ,