Trilobites were rapidly evolving forms and are of widespread use in biostratigraphic studies . 三叶虫是进化迅速的种型，并广泛用在生物地层学的研究上。
2.
Biostratigraphic zonation and mark - fossil erection should be based on restoring evolutionary pedigrees or occurrence sequences , and the boundary should be confirmed at the horizon of their " first appearance " 生物地层学研究一定要以恢复演化谱系或发生序列为基础，界线化石标志应该选在其“首现”层位。
3.
Guided by the theory of sequence stratigraphy and petroleum system using cores , lithologic log or well - logging , biostratigraphic and seismic data , adopting seismic inversion constrained to well data , digital analysis technology , basin modeling , test method and so on , and adopting an integrated study technology , aiming at lower exploration in chagan depression , this work put forward a new research thoughtfulness , technic flow and method system that is an integrated study by " looked upon sequence stratigraphy as a base , looked upon petroleum system as a integer , combing with each other closely " and tie in qualitative analysis and quantitative analysis and applied synthetically new theory , new technology and new method 以层序地层理论和含油气系统思想为指导，利用岩心、钻/测井、古生物以及地震资料，采用井约束下的地震资料反演技术、计算机技术、盆地模拟技术和各种分析实验手段等综合分析方法，针对查干凹陷勘探程度低的特点，提出了断陷盆地“以层序地层分析为基础、含油气系统为整体(系统)和二者紧密结合”以及定性与定量相结合，综合应用新理论、新技术和新方法的研究思路、技术路线和方法体系。
