但在海槽相区上二叠统不发育生物礁，飞仙关组缺乏鲕粒岩。
But no organic reefs were developed in the Upper Permian and the Feixianguan Formation is lack of oolite.
盘龙洞生物礁是目前所发现的川东北地区最具特色的长兴组二叠系生物礁，其生物礁古油藏是此类型古油气藏的典型代表。
Panlongdong organic reefs is the most typical Permian reefs of Changxing Formation in northeastern Sichuan, and its paleo-reservoir is the typical representation of this kind of reservoirs.
贵州紫云石头寨二叠系生物礁型古油藏是滇黔桂地区上古生界生物礁型古油藏的典型代表。
The Shitouzhai Permian paleo-oil reservoir in Guizhou province is a typical example of numerous Upper Paleozoic reef-type paleo-oil reservoirs in the Yunnan, Guizhou and Guangxi region.
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