泌阳凹陷深凹区岩性油藏发育规律

Characteristics of the lithologic reservoirs in the sag area of the Biyang depression

通过对深凹区岩性油藏成藏条件的分析认为:沉积控制了深凹区岩性油藏的空间分布;三角洲前缘发育优质储集体及优质烃源岩;湖侵体系域是优质烃源岩发育的有利层位,也是油气富集的有利层位。以此指导泌阳凹陷深凹区岩性油藏勘探,选择泌阳凹陷较大型沉积体系——侯庄三角洲前缘、古城三角洲前缘及平氏扇三角洲前缘为岩性油藏勘探突破点,其湖侵体系域为岩性油藏勘探突破的层系。在侯庄三角洲前缘安店地区泌354井及多物源交汇处的毕店地区泌359井取得新突破,打破了深凹区油气勘探的阻滞局面。

The conditions of hydrocarbon accumulation in the lithologic reservoirs in the sag area of the Biyang depression are studied. It is considered that sedimentation had controlled the spatial distribution of the lithologic reservoirs in the sag area; high-quality reservoir and source rock had developed in delta-front area; transgressive system tract was favorable site of high-quality source rock and hydrocarbon accumulation. Based on this understanding,the exploration of lithologic reservoirs focuses on larger sedimentary systems in the Biyang depression such as Houzhuang delta front,Gucheng delta front and Pingshi fan delta front,with transgressive system tract as the breakthrough measures of lithologic reservoir exploration. Exploration breakthroughs are made in Well Bi 354 in the Andian area of the Houzhuang delta front and in Well Bi 359 in the Bidian area where multiple sources interchanged,thus breaking the blockage situation of petroleum prospecting in the sag area.