中国地质2012，Vol.39Issue(1)：86-95,10.
鄂尔多斯台地靖边潜台南部中奥陶统马五21岩相古地理
Lithofacies Paleogeography of Middle Ordovician Ma521 in Jingbian tableland,Ordos platform
摘要
Abstract
The Middle Ordovician Majiagou Formation in Ordos basin was uplifted and eroded because of the Caledonian movement, forming favorable karst reservoirs. Therefore, the study of the sedimentary characteristics is of the key importance in oil-gas exploration. Based on the methods of single factor analysis (including analysis of stratigraphic thickness proportions of dolomite, limestone, gypsum and mudstone) in combination with detailed analysis and statistics of drilling core and logging data, the authors compiled and drew the lithofacies paleogeographic maps of Ma5(2/1) submembers. The results show that Ma5(2/1) was in a relative regression stage, and developed mainly gypsum -dolomitic flat, dolomitic flat, mud-dolomitic flat and mud-bearing dolomitic flat. According to lithofacies palaeogeographic maps in combination with stratigraphic thickness of Ma 5? , there may be a shallow depression in the middle of the study area, and hence the authors built the sedimentary model of Ma 5(2/1) in this area. On such a basis, the lithofacies palaeogeography of Ma5(2/1) can be summarized as "flats outside the lands, widespread dolomitic flats, depressions in flats, gypsum in depressions". According to the lithofacies paleogeography and regional geology of this area, the formation of favorable gas reservoirs has been discussed preliminarily in this paper.关键词
鄂尔多斯/马家沟组/碳酸盐岩/岩相古地理/靖边Key words
Ordos/Majiagou Formation/carbonate/lithofacies paleogeography/Jingbian分类
天文与地球科学引用本文复制引用
霍勇,罗顺社,庞秋维,金姗姗,罗军梅..鄂尔多斯台地靖边潜台南部中奥陶统马五21岩相古地理[J].中国地质,2012,39(1):86-95,10.基金项目
国家自然科学基金(41072086)资助. （41072086）
