泌阳凹陷大型构造-岩性复合油藏的成藏要素

Reservoiring factors of large structural - lithologic composite oil reservoir in Biyang depression

泌阳凹陷双河油田是中国东部大型构造-岩性复合油藏之一。该油田自1977年全面投入勘探、开发至2001年底,已累计探明石油地质储量10 176×104 t。油田生烃源岩丰富、储集砂体发育、运移通道良好、圈闭的形成与砂体的配置有利、油气保存条件优越,有利于油气聚集成藏。伴随双河鼻状构造的形成、演化,泌阳凹陷南部核桃园组三段砂体逐渐由沉积时期的下倾尖灭变为上翘尖灭,形成有足够大的储集空间和足够长的充注时间的小而肥的双河油气田。

Shuanghe oilfield in Biyang depression is one of the large structural-lithologic composite oil reservoirs in eastern China. Cumulative proved oil reserves in place have reached 101.76 million tons by the end of 2001 since overall exploration and development began in 1977. This oilfield has rich source rocks, well-developed sandbodies, good migration pathways, favorable matching of trap formation and sandbodies, and superior preservation conditions, all of which are favorable for hydrocarbon accumulation. Along with the formation and evolution of Shuanghe nose structure , sandbodies in the 3 member of Hetaoyuan Formation in southern Biyang depression change gradually from downdipping pinch-out to upwarping pinch-out, leading to the formation of the small but prolific Shuanghe oilfield with large reservoir space and enough time for charging hydrocarbon.