油气资源评价中体积速度法的应用

APPLICATION OF VOLUMETRIC VELOCITY METHOD TO HYDROCARBON RESOURCES ASSESSMENT

随着油气资源紧缺问题的日益突出,低勘探程度的区块越来越受到重视。合理利用勘探程度较高地区的地质信息,可快速、准确地评价低勘探程度区块的油气资源。二连盆地由50多个彼此独立、地质特征相似的凹陷组成,每个凹陷即是一个独立油气成藏单元。一般情况下,凹陷沉积速度越大,所堆积的沉积岩体积及有机质含量就越大、油气资源也愈多。油气资源量与沉积物填充平均体积速度之间存在双对数线性关系。为此,通过确定二连盆地的沉积体积速度与油气资源量之间关系,预测勘探程度低的中国石化登记区块的油气资源期望值为1.8813×108t。建议将布日敦南洼作为首选勘探目标,布日敦北洼、朝克乌拉凹陷和阿北凹陷作为第二层次勘探目标。

More and more attentions are paid to areas with low exploration maturity along with the shortage of hydrocarbon resources increasingly getting serious.Rational utilization of the geologic information obtained in areas with higher exploration maturity can aid the rapid and accurate assessment of hydrocarbon resources in the areas with low exploration maturity.The Erlian Basin consists of more than 50 separate sags with similar geologic(eatures,each of which is a separate oil/gas reservoir unit.Generally,higher sedimentation velocity means larger volume of deposits,higher content of organic content,and more hydrocarbon resources.There is a log-log linear relationship between hydrocarbon resources and average volumetric velocity of sediment filling.The relationship between sedimentary volumetric velocity and hydrocarbon resources in the Erlian Basin is defined and used to predict the expected hydrocarbon resources of the blocks with low exploration maturity registered by SINOPEC being 188.13 MMt.It is proposed to select Buridun South sub-sag as the primary exploration target,and Buridun North sub-sag,Chaokewula sag and Arbei sag as the secondary exploration targets.