龙门山式推覆及其在油气勘探中的意义

本文重点研究龙门山地区的构造发展史和沉积发展史,认为该区存在早晚有别、方向相反的两期推覆,即在晚三叠世—早侏罗世初曾一度向西推覆,而从晚第三纪之后改为由西向东的推覆,称为龙门山式推覆。推覆体之下是寻找油气的有利地区,早期推覆体下则更为优越。

NAPPING OF LONGMENSHAN TYPE AND ITS SIGNIFICANCE IN PETROLEUM EXPLORATION

The cavalcades of tectonics and sedimentation in Longmenshan area are discussed. There exist nappes of different times and in opposite directions, i.e: during late Triassic-early Jurassic, the area used to undergo a westward napping; while from the late period of late Tertiary until recent time, an eastward napping are predominant. Here we call this eastward type of nappes Longmenshan type. Areas favourable for petroleum exploration can be found under the eastward nappes, and still more promising areas are those beneath early formed nappes.