石油实验地质2016，Vol.38Issue(3)：303-310,8.DOI:10.11781/sysydz201603303
川西坳陷陆相脉冲式波动"二元"层序特征研究
LST and T?HST featured by impulse in continental sequences in the Western Sichuan Depression
摘要
Abstract
According to the basic concepts of sequence stratigraphy and the controlling factors of compressional basins, the continental sequences in the Western Sichuan Depression were studied, based on field outcrops, well cores and logging and seismic data. The episodic compressions of surrounding mountains controlled the sequence stratigraphy and sedimentary infill pattern in the western Sichuan foreland basins. Stress accumulated slowly for a long time, and released instantly. Lake?level ( basal level) and accommodation space changed in response to pe?riodic compression and relaxation, resulting in LST ( Lowstand System Tract) and T?HST ( Transgressive?High?stand System Tract) . Coarse?grained sedimentary bodies such as braided river and delta are dominant in LST, while T?HST in the upper part of the sequence is composed of fine?grained semi?deep lacustrine sediments. Verti?cally, delta facies sand bodies are interbedded with lacustrine mudstones, favorable for hydrocarbon generation, accumulation, preservation and trap formation. Lithologic reservoirs and lithologic-tectonic reservoirs formed by coarse grains at the bottom of the sequence are important exploration targets. Meanwhile, lithologic reservoirs in the upper part of the sequence on the basin margin provide additional opportunities.关键词
陆相层系/脉冲式波动/层序二元结构/演化模式/压性盆地/川西坳陷Key words
continental sequence/impulse/LST and T?HST/evolution pattern/compressional basin/Western Sichuan Depression分类
能源科技引用本文复制引用
张庄,叶素娟,杨克明,朱宏权,杨映涛,李旻,张世华..川西坳陷陆相脉冲式波动"二元"层序特征研究[J].石油实验地质,2016,38(3):303-310,8.基金项目
国家科技重大专项"四川盆地碎屑岩层系大中型油气田形成规律与勘探方向(二期)"(2011ZX05002-004)资助. （二期）
