辽河坳陷西部凹陷发育 2套区域性异常流体超压封盖层 ,将凹陷分隔成上、中、下 3层各自独立的层状流体封存系统。因超压封盖层深度较固定 ,不随层位变化 ,将其称为“船舱式流体封存系统”。下舱的顶板深 2 90 0～ 3 3 0 0m ,是形成最早、演化程度最高的油气发生器 ,生成的油气最丰富 ,大部分已向上运移到中舱和上舱 ;中舱深度为 12 0 0～ 2 90 0m ,具有广泛分布的高孔渗优质储集层和良好的超压封盖层 ,并发育良好的圈闭 ,最有利于油气成藏 ;上舱为 12 0 0m以浅 ,是开放式油气赋存系统 ,其边缘开启带处于湖盆岸线附近 ,是上、中、下 3层舱泄漏油气的共同排放带 ,油气来源丰富 ,成为稠油富集带。西部凹陷应加强中舱的勘探 ,在继续加强构造油气藏勘探的同时 ,应以寻找岩性等隐蔽油气藏为主 ;在上舱 ,应注重寻找浅层气和稠油 ;下舱勘探以寻找各凹陷的低潜山油藏为主。图 3参 17 Two sets of regional over-pressure seal covers were developed in the western depression of Liaohe Depression, and the depression was divided into three independent layered fluid seal systems in upper, middle and lower layers. Due to overpressure cap layer depth is fixed, does not change with the horizon, it will be called “cabin fluid seal system.” The roof of the lower chamber is 2 90 0-3 300 m deep, forming the earliest and most evolutionarily developed oil and gas generator with the most abundant hydrocarbon generation and most of it has been transported upward to the middle and upper compartments; the mid-cabin depth is 12 0 0 ~ 2 90 0m, with widely distributed high porosity and high permeability reservoirs and good overpressure caprocks with well developed traps, which are most conducive to hydrocarbon accumulation; The open hydrocarbon reservoir system has an open margin at the edge of the lacustrine basin. It is a common discharge zone for oil and gas leakage in the upper, middle and lower 3-compartment reservoirs. It is rich in oil and gas and becomes a heavy oil-rich zone. In the western depression, the exploration of midcases should be strengthened. While further exploration of structural reservoirs should be strengthened, the subtle reservoirs such as lithology should be looked for. In the upper cabin, shallow gas and heavy oil should be paid attention to. The depression of the buried hill reservoir mainly. Figure 3 参 参