内蒙林西-吉林九台地区多处发现晚二叠世生物礁、海相灰岩和化石、及晚二叠世\早三叠世角度不整合。申请立项研究,对促进我国北方生物礁研究发展，重新认识研究区晚二叠世古地理环境和演变，及论证兴-蒙海槽闭合隆起均具有重要意义。本项研究强调以严格化石分带、系统同位素测年和精细地层划分对比为基础；突出研究代表性礁体和礁相地层的形态结构、群落生态和建造机制等基本特征；揭露隐伏礁体，确定生物礁链的生长发育和环境制约；利用生物礁的特殊指相优势，结合晚二叠世礁相地层的沉积相分析和海平面升降，恢复研究区古地理环境及演变；深入研究晚二叠世\早三叠世角度不整合，查明上覆/下伏地层的产状、分布和沉积归属，论证生物礁链时空分布与兴-蒙海槽闭合隆起的关系；以及系统研究晚二叠世地层的油气生储盖特性。申请者和项目成员长期从事相关学科研究，具有丰富的工作经验，项目前期工作基础坚实，研究实施能够达到预期目标。

Some important discovers, Late Permian organic reefs, marine limestone and fossils, and Permo-Triassic angle unconformities, have been firstly made in regions of the Linxi, Inner Mongolia - the Jiutai, Jilin. If they could be studied further, many progresses would be achieved for promoting forward the reef-study in North China, restoring palaeo-geographical conditions, and providing evidences to discuss about closing, folding and raising of the Xingan-Inner Mongolia sea-trough.Study of this project will be carried out based on accuratting fossil zones, measurring isotope-chronic specimens and refining stratigraphic division-correlations. Characteristic studies about reefs and reef-facies strata will be done carefully on build-categories, community ecologies, developments and condition-restrictions. And according to basal characters of reefs and the reef chain, the palaeo- geographical conditions and variations will be restored systematically by analysing sedimentary facies and sea-level elevations of the Upper Permian. Then Perrmo- Triassic angle unconformities will be investigated about occurrences, distributions and fasies of their overlayers and underlayers. Moreover, combining regional investigation and exposing hidden-reef bodies, a relationship will be discussed between space-distributions of the reef-chain and close-raising of the Xingan-Inner Mongolia sea-trough. Besides,the source-reservior-cover of oil-gas will be analysed for reef-facies strata in the Upper Permian. The applicant and his group have been worked on reefs and related researches for a long time, and accumulated with rich materials and experiences. And the study of project has reliable work-bases of the earlier stage and could arrieved at the expect objective.