川东北元坝地区上三叠统飞仙关组沉积特征

根据元坝地区内岩石学特征、沉积构造、古生物类型,结合测井、地震等地球物理标志综合分析,认为研究区的飞仙关组一段为海侵期开阔台地——陆棚沉积;飞仙关组二段为海退期产物,以台内、台缘鲕粒滩沉积为特征;在飞仙关组三段为海侵期开阔台地;飞仙关组四段为海退期蒸发台地。在研究区沉积相研究的基础上,本文指出有利储集相带主要为台内、台缘鲕粒滩,应为主要的勘探靶区。

The comprehensive analysis which was according to the rock characteristics,sedimentary structures,palaeontological types and the geophysical signs such as logging and seismic in Yuanba area,showed that the first section of Feixianguan in the study area is transgression sediments of open platform - shelf;the second section is the product of regression,characterized by the sediments of platform and platform margin oolitic beach;the third section is open platform of the transgression;the fourth section is evaporation platform of the regression.The article pointed out that platform,platform margin oolitic beach were the main favorable reservoir,and they should be the main exploration target.