石油实验地质2011，Vol.33Issue(1)：1-11,11.
中上扬子地区燕山运动及其对油气保存的影响
Yanshan Movement and its influence on petroleum preservation in middle-upper Yangtze region
摘要
Abstract
Based on systemic researches on unconformity, tectonic dating and deformation of Jurassic and Cretaceous in different locations of the middle- upper Yangtze region, the Yanshan Movement was divided into 4 stages: the end of Middle Jurassic ( Ⅰ ), the end of Late Jurassic to the beginning of Early Cretaceous ( Ⅱ ), the end of Early Cretaceous ( Ⅲ) and the Late Cretaceous ( Ⅳ ) , among which the stage Ⅱ was the main deformation stage. The Yanshan Movement was significant for tectonic transfor mations in the middle-upper Yangtze region. Tectonic movements during the early stages ( Ⅰ and Ⅱ )were characterized by multi- direction compression and thrusting, while those of the late stages (Ⅲ and Ⅳ) held the structural features of western compressing vs. eastern extending with differences in basin -mountain relationship, deformation pattern and geodynamic mechanism. Meanwhile, the stage Ⅱ had controlling effects on hydrocarbon preservation in the study area. It caused differences in uplifting-sub siding and marine facies hydrocarbon preservation, and further influenced exploration potential in diffe rent structural belts. For example, the Sichuan Basin which continued subsiding was favorable for hydro carbon preservation, and had experienced 3 accumulation stages: early reservoir, conversion from oil to gas, and late adjustment. The fold-thrust belt on the upper Yangtze margin which continued uplifting and eroding was unfavorable for hydrocarbon preservation, and had experienced 2 accumulation stages: early reservoir as well as late reconstruction and destruction. The middle Yangtze region developed to depositional system of tectonic rift within mainland after the stage Ⅱ . Its hydrocarbon preservation conditions lay in the sealing capacity of re-type continental caps and the accumulation was limited by the effectiveness of secondary hydrocarbon generation. The upper and lower combinations in the Sichuan Basin are the most potential exploration targets. On the margin of Central Guizhou Uplift and in the western Hunan and Hubei region to the east of Qiyueshan Fault, the lower combination below the Cambrian gypsum layers may have some exploration prospects. In the southern depression of the Jianghan Basin, conditions for secondary hydrocarbon generation, late accumulation and preservation may be good under continental covers.关键词
燕山运动/主变形期/构造格局/油气保存/勘探前景/中上扬子地区分类
能源科技引用本文复制引用
何治亮,汪新伟,李双建,沃玉进,周雁..中上扬子地区燕山运动及其对油气保存的影响[J].石油实验地质,2011,33(1):1-11,11.基金项目
国家科技重大专项项目(2008ZX05005)、国家自然科学基金项目(40739904,40739902)资助. （2008ZX05005）
