【摘要】 基于沉积、构造综合分析,利用露头、钻井、测井及地震资料,研究四川盆地震旦系威远—安岳拉张侵蚀槽的平面、剖面特征,并根据地层、岩性、构造及区域演化等特征对震旦系进行剥蚀恢复,再现桐湾运动时期拉张侵蚀槽各阶段发育演化及其改造过程。威远—安岳拉张侵蚀槽沿蓬莱—安岳—荣昌一线呈北西向展布,具有东陡西缓的特征。研究横跨拉张侵蚀槽中部的威远—龙女寺地震剖面发现,威远—安岳拉张侵蚀槽是震旦纪期间基底断裂多幕堑垒式活动导致灯影组地层差异抬升、差异侵蚀和差异溶蚀等多种地质过程综合作用的结果,其形成可分为早、中、晚3个阶段。通过剖面剥蚀恢复,定量测算了拉张侵蚀槽侵蚀、溶蚀量,最大可达600 m。图11参28更多还原

【Abstract】 Based on comprehensive analysis of deposition and structure, the horizontal and vertical characteristics of the Weiyuan-Anyue extension-erosion groove have been studied by outcrop, drilling, well logging and seismic data. According to the strata, lithology, structure and regional evolution, Sinian system before the erosion has been reconstructed to show the development and transformation of the erosion-extension groove in the Tongwan movement. The Weiyuan-Anyue extension-erosion groove is distributed along the Penglai-Anyue-Rongchang in NW direction, with the east area steeper than the west in groove. According to the study of the Weiyuan-Longnüsi seismic profile across the middle area of extension-erosion groove, the formation of the Weiyuan-Anyue extension-erosion groove is the synthetic result of different geological processes from differential uplift, differential erosion and dissolution in the Dengying Formation caused by the multiple-phase episode grabon or horst movement of the basement fault in Sinian. The formation of the Weiyuan-Anyue extension-erosion groove can be divided into three stages, and the erosion and dissolution can be calculated quantitatively by denudation recovery profile, its maximum can reach 600 m.更多还原