潜江凹陷潜江组油气藏油气充满度特征

On the Fullness Trait of Oil-Gas Reservoir of Qianjiang Formation in Qianjiang Depression

根据潜江凹陷100个油藏和钻测井资料,利用油气藏油气充满度方法研究表明,潜江凹陷潜江组油藏的充满度分布在3.1%至97.6%之间,大部分在50%以上,但总体偏低,平均为49.5%。油气藏主要分布在潜四段、三段地层中,其中潜四段岩性油藏充满度最高达70%;远离烃源岩层或生烃中心的油藏油气充满度低,低于49.5%。潜江组油藏受成藏动力、油源条件、构造活动及砂体储层物性等控制,造成油气充满度偏低。

On the basis of the data of 100 Reservoirs as well as drilling and logging in Qianjiang Depression and by means of the fullness method, the research is launched on the fullness trait of oil-gas reservoir of Qianjiang forma- tion. The research shows that its fullness is between 3. 1% and 97. 6% with the overwhelming majority over 50%. However, its average is 49. 5%, which is lower as a whole. The reservoirs are mainly distributed in Qian-4 mem- ber and Oian--3 member. It is found that the fullness of lithologic reservoir in Qian-4 member reaches 70% at maximum while that of oil--gas reservoir far from source rocks or hydrocarbon--generation center is less than 49. 5%. The main controlling factors for a lower fullness of oil--gas reservoir of Qianjiang formation are Accumulation dynamics, source condition, tectonic activity and physical property of sandbody reservoir.