摘要
针对陕北子洲地区山西组是否受海水影响的争议,对该组岩石进行了微量元素测试。结果显示山西组的古环境以淡水为主,但间或受海水的影响。根据野外露头和岩心观测,依据沉积旋回、岩电特征、沉积构造等,识别出研究区山西组为曲流河三角洲,发育三角洲前缘,以水下分流河道广泛发育为特征,并构成研究区天然气的主要储集砂体,可进一步划分为水下分流河道、分流间湾、间湾沼泽等微相;论述了山23段沉积微相的平面展布。
Aimed at the discussion that the paleo-environment was or not influenced by seawater when Shanxi Formation was deposited, microelement testing is analyzed. And the result shows that the water in paleo-environment mainly was freshwater, but periodly influenced by seawater. Applied with field outcrop and core description, combining with sedimentary cycle, the character of hthology and electromotive curve, sedimentary structure etc, the front delta in meandering delta of Shanxi Formation are identified in study area, in which subaqueous distributary channels were developed widely and was the main sand body for gas accumulation. Furthermore, sub-aqueous distributary channel, inter-distributary bay, inter-distributary swamp etc are main micro-facies in front delta. The sedimentary microfacies of Shah2^3 in plane are discussed.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2006年第5期5-8,共4页
Coal Geology & Exploration
基金
国家重点基金研究发展计划(973)项目(2003CB214602)
关键词
山西组
三角洲
古盐度
沉积微相
陕北子洲地区
Sbanxi Formation
delta
paleosalinity
sedimentary micro-facies
Zizhou region
