关于开江-梁平海槽的认识

前人认为开江-梁平地区在晚二叠世长兴期-早三叠世印支早期为海槽沉积区,并称为“开江-梁平海槽”。由于对该区沉积格局的认识和确定直接涉及川东北地区的油气勘探部署。因此,在沉积学研究的基础上,利用钻井、地震资料获得的新成果,从区域构造背景、海槽的概念和沉积等角度,进一步系统阐述了开江-梁平地区长兴期-早三叠世早期不是海槽沉积环境,而是碳酸盐台地中水体相对较深的台棚环境,且以沉积泥晶灰岩为主,并有高能滩沉积。

A discussion on Kaijiang-Liangping ocean trough

It is previously believed that Kaijiang-Liangping area was an ocean trough during Changxing age of Late Permian-Early Indo-Chinese epoch in Early Triassic,and was called "Kaijiang-Liangping ocean trough".The understanding and definition of the sedimentary framework in this area are directly related with exploration deployment in the northeastern part of Sichuan basin.Based on sedimentological study and the new understan-(dings) obtained from drilling and seismic data,it is demonstrated,in respects of tectonic setting and the concept and sedimentation of ocean trough,that Kaijiang-Liangping area was not an ocean trough during Changxing age of Late Permian-early Early Triassic,but a platform-shelf with relatively deep water within a carbonate platform,and the sediment was dominated by micrite with some high energy shoal deposits.