陈家庄凸起北坡三角洲砂体储层描述及含油性分析

Description of delta sand body reservoir and oil-bearing analysis in north slope of Chengjiazhuang uplift

陈家庄凸起北坡沟谷内发育了东营组三角洲沉积。本文通过对古地貌、岩石电性特征、砂体地震反射特征和沉积相分析,认为东营纽砂体为三角洲前缘河口砂坝沉积。文中利用三维可视化技术,对三角洲前积砂体的空间展布进行了描述;解释发现15个前积砂体,由南向北依次呈叠瓦状排列。在此基础上通过聚类分析技术对砂体进行了含油性分析,认为:①三角洲前积砂体仅部分含油,油气主要聚集在砂体高部位;②砂体含油高度较小,灌满程度较低;⑨油藏主要受砂体岩性控制,古地貌对砂体含油也有一定影响;④沟谷两侧超覆带砂体含油性较好。

The Ed delta deposition is developed in the gulches and valleys of the north slope of Chengji-azhuang uplift. Through the analyses of paleogeo morphology, electric character of rock, seismic re flection feature of sand body and sedimentary fa-cies,the paper considered that Ed sand body is deposition of delta-front mouth bar. Using 3-D visualization technique, the paper conducted the de scription of spatial distribution of delta foreset sand body; 15 foreset sand bodies were discovered by interpretation, which is imbricate arrangement from south to north. On that basis,the oil-bearing analysis of the sand bodies was conducted by cluster analysis technique, which considered (1) there some parts of delta foreset sand bodies that are oil bearing sand bodies and oil-gas mainly accumulates in the high position of sand body; (2) the height of oil column of sand body is shorter and filling level is lower;(3)the reservoir is mainly controlled by the lithology of sand body and paleogeomorphology has some influence on oil-bearing characters of sand body; (4)the sand bodies in overlap belt on both sides of gulches and valleys have good oil bearing feature.