孤岛油田中一区馆5段隔夹层划分与展布

Division and distribution of the barrier beds and interbeds in Guantao-5 member of Zhongyi area,Gudao Oilfield

依据孤岛油田中一区的地质特点,处理了区段内1 000余口井的测井地质资料,对分布于研究区段的隔夹层进行了定性、定量的研究,共划分出8个砂层组、17个单砂层.7个隔层和9个夹层.对隔层展布及砂体单元内夹层的分布进行了描述,并对隔夹层与剩余油的分布规律之间的关系进行了分析和研究.研究发现在G2,G5,G6和G7下部单元的顶部剩余油富集程度高.主力油层馆532,531和541夹层分布密度和分布频率较小,剩余油饱和度较低,但可采剩余油绝对数量较大;馆51、馆52、馆542、馆55、馆56夹层分布密度和分布频率值较高,剩余油富集程度较高.

The logging data from more than 1000 wells in this region are studied on the basis of the geological features of Zhongyi area in Gudao Oilfield.After the barrier beds and interbeds distributing in Guantao 5 member are qualitatively and quantitatively studied,Guantao-5 member is divided into 8 sand sets,17 single sand layers,7 barrier beds and 9 interbeds.The distributions of the barrier beds and interbeds are also described.The relationships between the distributions of the barrier beds and the interbeds and remaining oil distribution are studied.It is shown that remaining oil is rich at the tops of the reservoirs at the bottoms of G^2,G^5,G^6 and G^7 barrier beds.The distribution frequency and the distribution density of the interbeds in Guantao 5^(32),Guantao 5^(31),Guantao 5^(41) members are lower,remaining oil saturation is lower too,but the absolute quantity of recoverable remaining oil is great.The distribution frequency and the distribution density of the interbeds in Guantao 5~1,Guantao 5~2,Guantao 5^(42),Guantao 5~5,Guantao 5~6 members are higher,so their remaining oil enrichment degrees are also higher.