中国地质2011，Vol.38Issue(5)：1263-1273,11.
潜江凹陷东部地区新沟咀组下段浅水三角洲沉积模式
Shallow water delta depositional model of the lower segment of the Xingouzui Formation in eastern Qianjiang depression
摘要
Abstract
The lower segment of the Xingouzui Formation in eastern Qianjiang depression is an important horizon for finding lithologic hydrocarbon reservoir in the future. Based on a synthetic analysis of core description as well as thin section and logging data in combination with sedimentary marks of lithology.paleoclimate, sedimentary structure,and the depositional background of weak tectonic movement and flattened palaeotopography.the authors hold that the lower segment of the Xingouzui Formation is of a shallow water delta depositional system. The shallow water delta has the following characteristics: ①there exist well-developed underwater distributary channel microfacies, underdeveloped mouth bar,extensive sand sheet,and frequently alternate pre-delta and front deposition; ②various fades belts are smoothly connected with each other without apparent slope gradient; ③depositional model has no three-layer structures like "Gilber delta". During the depositional evolution,the shallow water delta deposition was affected by such factors as palaeoclimate,density contrast of stream and salt lake, fluviatile action and lake surface fluctuation., and the shape and the development extent of the underwater distributary channel were especially apparently controlled by these factors, forming strong or weak reformed front sand. Favorable allocation for generating reservoirs and cap rocks in the lower segment of the Xingouzui Formation was favorable for forming lithologic hydrocarbon reservoirs.关键词
潜江凹陷东部/新沟咀组下段/浅水三角洲/沉积模式Key words
eastern Qianjiang depression/lower segment of Xingouzui Formation/shallow water delta/depositional model分类
天文与地球科学引用本文复制引用
胡忠贵,胡明毅,胡九珍,刘冬梅..潜江凹陷东部地区新沟咀组下段浅水三角洲沉积模式[J].中国地质,2011,38(5):1263-1273,11.基金项目
国家重大专项子课题"大面积砂岩、台缘礁滩沉积机理与有利储集体展布"(2008ZX05007-002-001)资助. （2008ZX05007-002-001）
