摘要
燕山期是川西上三叠统源岩生烃高峰期，该期的构造演化对油气聚集有重要意义。根据构造背景和沉积特点的不同，燕山期川西的构造演化可分为振荡抬升、局部凹陷、统一湖盆、沉降萎缩四个阶段。沿龙泉山断裂一带的构造活动对该区的地质演化有重要作用。根据现今构造形迹展布和燕山期构造演化的特点，可将川西划分为东部隆升断褶带、南部斜坡断褶区、西部陡坡断褶带和中部凹陷四个区块。其中东部隆升断褶带最有利于油气聚集，应重点勘探。
Structural evolution in the Yanshah epoch was of great importance to oil and gas accumulation in west Sichuan,owing to hydrocarbon-generating peak of the source rock in the Yanshan epoch.On the basis of tectonic setting and sedimentation,the structural evolution in west Sichuan in the Yanshan epoch may be divided into four phases:oscillating uplift,partial depression,whole lake basin and subsidence contraction phases.Tectonism along the Longquanshan fracture zone played an important role in geologic history of this region.On the basis of existing structural features and structural evolution in the Yanshan epoch,west Sichuan region may be divided into uplifting fault-fold zone in east,gentle slope fault-fold zone in south,deep slope fault-fold zone in west and depression in centre.The uplifting fault-fold zone in east is favourable for oil and gas accumulation and,therefore,should be considered as a exploration target.
出处
《四川地质学报》
1994年第1期44-52,共9页
Acta Geologica Sichuan
关键词
构造演化
油气勘探
燕山期
川西
structural evolution,oil and gas exploration,Yanshan epoch,west Sichuan
