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在充分认识含油气盆地的基本石油地质条件的前提下,油气成藏的模式是寻找油气勘探切入点的关键。潜江凹陷周返断裂带大多数岩性油藏主要分布在周返地区与断层配置的构造斜坡带上。其中潜三、四段烃源岩厚度最大,生油指标高、成熟度好、生油潜力大,是主要的油源层段;三角洲前缘沉积体系为油气成藏提供了丰富的储集空间;蒸发岩类是潜江凹陷内最理想的区域性盖层;潜江组地层中有规律展布的断层发育带使得大面积分布的含油岩性在侧向经断层、构造的封挡形成多个有效的复合圈闭。周返断裂带主要形成2种岩性油藏:在单斜背景上砂体上倾尖灭,形成上倾尖灭岩性油气藏,或在断鼻或背斜构造背景上,河道砂体受断层切割形成断层+岩性油气藏或构造+岩性油气藏。
On the premise of fully understanding the basic petroleum geologic conditions of petroliferous basins, the mode of hydrocarbon accumulation is the key to find the entry point for oil and gas exploration. Most of the lithologic reservoirs in the Zhouwuan fault zone in the Qianjiang sag are mainly distributed in the structural slope zone of the Chengtu area and the fault configuration. Among them, the source rocks of the third and the fourth member have the largest thickness, the high oil generation index, the good maturity and the high potential for generating oil, which are the main oil source intervals. The delta front depositional system provides plenty of reservoir space for hydrocarbon accumulation ; Evaporites are the most ideal regional caprock in the Qianjiang sag; the regularly developed fault zones in the Qianjiang Formation stratigraphy make large-area oil-bearing lithologies in the lateral faults and the sealing blocks of the structures form more A complex composite trap. Two types of lithologic reservoirs are mainly formed in the Zhou-Fan fault zone: the updip pinch-out reservoir is formed on a monoclinic background, forming an updip pinch-out lithologic reservoir, or on the nose or anticline tectonic setting, Fault cutting forms faults + lithologic reservoirs or structures + lithologic reservoirs.