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通过对八面台油田北部青一段20号小层油藏分析,对其成藏条件及主控因素的由弱到强分为四个层级:一级为烃源岩油源供给充足。源于中央坳陷区广泛分布的青一段湖相泥岩生成的轻质原油向西高部位侧向运移进入青一段储层聚集成藏;二级为断层的控制作用。近南北向断层与渗透性砂体构成断层-岩性圈闭。断层控制了区域上原油分布范围,但对局部原油富集控制作用有限;三级为构造高点。从构造精细解释成果来看,单一因素的构造圈闭,分布面积十分有限,构造高点对油藏富集的控制作用不明显;四级为沉积微相砂体。本区对原油富集最有利的沉积微相为三角洲前缘河口沙坝、其次为水下分流河道砂体。
Based on the analysis of the small reservoir No.20 in the northern part of the Badiantai oilfield, the reservoir forming conditions and main control factors are divided into four levels from weak to strong: the first level is enough supply of oil source rocks. The light crude oil from the Qinglian lacustrine mudstone, which is widely distributed in the central depression area, migrates laterally to the western part of the upper reaches to accumulate and accumulate in the first member of the Qinghai Formation. The second stage is the fault control. Near north-south fault and permeable sand body constitute a fault-lithologic trap. The fault controlled the distribution range of crude oil in the area, but limited the control of local crude oil enrichment. The third grade is the structural high point. From the results of detailed interpretation of the structure, the structural traps and distribution areas of the single factor are very limited, and the control point of the structural high point on reservoir enrichment is insignificant. The fourth grade is the sedimentary microfacies sand body. The most favorable sedimentary microfacies for the enrichment of crude oil in this area are delta front sand bar, followed by underwater distributary channel sand body.