Ordovician

1.This character differs from other Ordovician source rocks elsewhere in the world such as Kukersite Kerogen in Estonia and Guttenburgen type source rocks in USA.

其成主要有底栖宏观藻类、线叶植、隐孢子、疑源类和几丁虫等。

2.It's a residual mountain(unaka) which were a set of thrust blocks under the erosion unconformity.It's reservoir pore space is a fracture-vug-pore system of Ordovician carbonate karst.

该气藏的构造为道冲构造侵蚀而成的残丘山,储集体为系碳酸盐岩溶蚀缝洞孔体系,流体呈层状分布(集中分布于系峰峰和马家段)。

3.From 2003 to 2004, we collected a large amount of Nautiloid and Graptolite fossils in upper metamorphic formations of Mayigangri area and determined the age to be middle and Late Ordovician-Silurian.

在羌塘南部地区发现有可靠化石依据的早古生代地层存在尚属首次。