东辛地区沙河街组三段中部砂体沉积特征及控制因素

描述和分析了东辛地区沙河街组三段中部砂体的沉积与发育特点，进而说明该砂体发育的地区性控制因素。认为，在沙三段中部沉积时期东辛地区位于东营凹陷东部三角洲前缘和前三角洲深肖相带，由于三角洲前缘多次滑塌，形成了一系列沙三中滑塌浊积扇体。根据砂体同生变形构造发育，粒序层理与鲍马序列少见的特点判断，砂体的浊积类型主要是由碎屑流形成的滑动浊积岩。

SAND BODY SEDIMENTARY CHARACTERISTICS AND CONTROL FACTORS IN THE MIDDLE THIRD MEMBER OF SHAHEJIE FORMATION IN DONGXIN REGION

In the middle 3rd member of Shahejie Formation, a series of fan turbidities, originated from the slumps of sediments in deltafront, developed in Dengxin region which are located in the delta-front and predelta facies of Dongying delta, east Dengvingdepression. Based on the characteristics of well-developed de formation structure and less-developed grain grading and Boumasequence, the sand bodies are classified as the slumped turbidite resulted from detrital nows. The development characteristicsof sand bodies are determined by the palaeotopography of the basin deposited. The small sags provided stable channels fordetrital and turbidity flows, which were beneficial to the accumulation and superposition of sediments- So the large-sized sandbodies formed there- Those are clearly different from the sand bodies developed in open Niuzhuang sag.