中扬子地区二叠纪生态地层学及古地理特征

PERMIAN ECOSTRATIGRAPHY AND PALEOGEOGRAPHIC CHARACTERISTICS OF MIDDLE YANGTZE AREA

中扬子地区二叠纪１９个群落生境型的分析及各时期群落的横向展布，揭示了中扬子地区二叠纪海平面和古地理演变特征及其与生油条件的关系，并将二叠纪生态体系演化划分为１０个阶段，阐述了各阶段的生油和储靠性能。通过对中扬子地区二叠纪生态地学研究，首次建立了其生态地层系统，其中包括１９个群落带、１０个群落组和６个群落群，并阐述了各生态地层单位的分布、组成、顶底界线及其生态环境与油气生储条件的关系。

Based on the analysis of the habitat type of Permian nineteen communities of middleYangtze area and the crosswise extension of communities of every age , Permian characteris-tics of the evolution of sea level and paleogeography and the relation to oil-generating condi-tions are revealed in this paper, and the Permian ecologic system is divided into ten evolutionstages , and the potential ability of oil-generating and storaging of every stage are expoundedalso in this paper. Based on a study of Permian ecostratigraphy of middle Yangtze area, theauthors have established the Permian ecostratigraphic system of middle. Yangtze area for thefirst time, which inchdes nineteen community zones, ten community formations, six cornmu-nity gatherings, And their distributions,compositions , top and bottom boundary lines, ecolog-ic environments and the relation to the conditions of oil-generating and storaging are ex-pounded also.