It is reported that the Upper Paleozoic coals are the major gas-source rocks in Ordosbasin, one of the most important oil-gas sedimentary basin in our country.
鄂尔多斯盆地是我国重要的含油气沉积盆地之一，上古生界煤是盆地内上古生界天然气藏的主要的气源岩。
A mineral consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major source of titanium.
一种含有二氧化钛的矿物，呈晶体状，见于变质岩和火成岩中，是钛的主要来源。
In the Ordos Basin, the major controlling factor for the Early Palaeozoic gas exploration is whether (effective) source rocks are developed.
鄂尔多斯盆地下古生界天然气勘探的制约因素是有效烃源岩的问题。
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