Origin and Petroleum Geological Significance of Carbonate Rock Concretes in Linxi Formation, Northeast of Inner Mongolia, China
详细信息
- 责任者：Ou Lihua (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Yi Haisheng
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(4)
- 关键词：碳酸盐岩 ; carbonate rocks ; 生烃潜力 ; hydrocarbon generating potential ; 结核 ; concretions ; 内蒙古 ; Inner Mongolia
- 页码：p.438-444
- 图表：3 illus., 2 tables, 21 refs.
- 分类号：1003
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
There develop a number of carbonate concretes in the black mud shale sediments on the deep outer continental shelf of Upper Permian Linxi Formation in the sum area of Harigentai village,Xi Ujimqin Qi,Inner Mongolia.These carbonate concretes show lentoid,concretionary and mound structures in the field,similar to the cold spring carbonate rocks formed on the ancient and modern ocean floor.The micro fabric,matter composition and carbon isotopic characteristics are researched in detail.Microscopic observations show that there are many vesicular structures,organisms and pyrite to aggregate in the carbonate concretes.The stable carbon-oxygen isotopic characteristics show that in the carbon isotope exist negative values,indicating the origin of the organic carbon.These features are similar to that of the cold spring carbonate rocks formed on the modern ocean floor because of natural gas seepage.Therefore,the paper infers that the carbonate concretes in study area are the cold spring carbonate rocks formed on the ancient ocean floor because of natural gas seepage.This suggests that during the deposition of Linxi Formation,there were gas hydrates on the ocean floor,which might be relative to the methane release from the deep grey-black mud shale deposited earlier.A potential analysis about hydrocarbon source rocks also show that the deep grey-black mud shale wide developed in study area have a certain hydrocarbon-generating potential,and the Linxi Formation has a relatively good potential for petroleum exploration.But because of the relatively old strata,and the influences of diagenesis and tectogenesis,the petroleum exploration is rather difficult in present.
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