大型含油气带及其范围内的巨型油气藏比较少见。有利的水文地质条件对它们的形成,尤其对它们的长期保存是必不可少的。大型含油气带首先形成于那些生油气源岩有机质含量高的剖面中,并位于成油主带或下成气带温度段的沉积盆地中。在储集层流体重力分层和在地下与古地表之间很难进行水交换的条件下,有利于烃类聚集的聚油面积和有利的区域构造层面积应该足够大。正 Large-scale oil-bearing belts and giant gas reservoirs within their boundaries are relatively rare. Favorable hydrogeological conditions are essential for their formation, especially for their long-term conservation. Large-scale oil-bearing belts were first formed in the high-organic-matter-rich sections of the source rocks, and were located in the sedimentary basins where the oil-forming belts or gas belts were located. Under the conditions of fluid gravitational stratification in the reservoir and the difficulty of water exchange between underground and paleogeographical surfaces, the area of ​​oil-rich and favorable tectonic strata favoring hydrocarbon accumulation should be large enough. positive