辽河小洼油田东营组沉积环境条件的研究

陆相盆地沉积作用主要受构造作用及古气候的控制，所以从区域构造背景出发，结合地层、古生物、沉积、地球化学等方面资料，对小洼油田东营组的沉积环境条件进行综合分析。确定了沉积物源来自北东方向的中央凸起，古气候属于半干旱—半潮湿的温带气候条件，水介质是弱还原性的淡水滨浅湖泊沉积环境。此时中央凸起上丰富的风化剥蚀产物经过河流的搬运和分异作用，进入湖盆中形成三角洲沉积体

SEDIMENTARY ENVIRONMENTS OF THE DONGYING FORMATION IN THE XIAOWA OIL FIELD,LIAOHE BASIN,LIAONING

Sedimentation in continental basins is generally controlled by tectonism and palaeoclimates.The present paper focuses on the sedimentary environments of the Dongying Formation in the Xiaowa oil field on the basis of the analysis of stratigraphic,palaeontological,sedimentary and geochemical data.The sediments are mainly derived from the central uplift in the northeast.The palaeoclimates are semiarid and semihumid temperate climates,and the water media indicate weakly reduced freshwater littoral and shallow lacustrine environments.The abundant weathering products were differentiated and transported by rivers into lakes to form the deltaic sedimentary bodies in the study area.