济阳坳陷中浅层天然气运聚模拟试验

济阳坳陷沙河街组三段中下亚段和四段上亚段为主力气源岩层,其埋深一般小于 3000m。采用从德国引进的油气水三相运聚盆地模拟软件(IES Petroflow)进行运聚规律模拟,结果表明,该区浅层天然气可呈多相态运移,但初次运移以溶解相为主,二次运移主要为游离相态,形成浅层次生气藏;平方王潜山及其附近地区天然气的主要运移期在明化镇组和第四系沉积时期,运聚方向受古地形控制,以侧向运移为主。东辛永安镇地区由于断裂系统发育,天然气以垂向运移为主,主要成藏期仍为明化镇期和第四纪。整个济阳坳陷的中浅层天然气藏可分为双断式凸起带、单断式凸起带、断裂带及斜坡带 4种运聚型式。

SIMULATION TESTS ON MIGRATION AND ACCUMULATION OF MIDDLE-SHALLOW BURIED GASES IN JIYANG DEPRESSION

The middle and lower submembers of Sha 3 member and the upper submember of Sha 4 member in Jiyang Depression are the main gas source rocks.The burial depth is generally less than 3 000 m.A german developed oil gas water phase simulation software(IES Petroflow)was used to simulate the gas migration and accummlation regularites of the depression.The result suggests that the gas could migrate in different phases.The primary migration was in solution phase;the second migration was in free phase and resulted in shallow secondary gas pools.The gas in Pingfangwang buried hill and its neighbouring areas as well as Dongxing Yonganzhen migrated in Minghuazhen Formation and Quaternary depostitional stages.The migration types could be divided into double faulted uplift zone type,single fault uplift zone type,fracture zone and slope zone types.