A method to determine preferential pathways for hydrocarbon migration in “lower source rock and upper reservoir” combination and its application

Wang Haoran; Fu Guang; Su Bilin; Sun Tongwen; Tang Wenhao

doi:10.11743/ogg20180613

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A method to determine preferential pathways for hydrocarbon migration in “lower source rock and upper reservoir” combination and its application
Vol. 39, Issue 6, Pages: 1237-1245(2018)
Online First：28 December 2018，

Published：2018
DOI： 10.11743/ogg20180613
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DOI：

Wang Haoran, Fu Guang, Su Bilin, et al. A method to determine preferential pathways for hydrocarbon migration in “lower source rock and upper reservoir” combination and its application[J]. 2018, 39(6): 1237-1245. DOI： 10.11743/ogg20180613.

摘要

基于下生上储式油气运移模式及特征，结合三维地震资料、测井和录井资料，分别利用油气成藏期断层活动速率与断面油气势能相结合、砂地比与砂体顶面流体势能相结合的理论，建立了一套下生上储式油气运移优势路径的确定方法，进而可得到下生上储式油气优势成藏范围。将该方法应用到了海拉尔盆地贝尔凹陷局部构造南屯组一段下生上储式油气成藏中。结果表明：南屯组一段下生上储式油气成藏分为油气垂向运移模式和先垂向后侧向运移模式，分别确定其中油气运移优势路径有17个和11个，相应的油气优势成藏范围分别为2.3 km和1 km。与研究区内油气实际分布规律相对比，计算结果与实际情况吻合，表明该方法可以用于确定下生上储式油气运移优势路径，有利于划定下生上储式油气优势成藏范围，可以为油气勘探提供指导作用。

Abstract

The study is based on the analysis of characters of hydrocarbon migration within a lower source rock-upper reservoir combination

and 3D seismic and logging data.We worked out a method to determine the preferential pathways for hydrocarbon migration through combining fault activity ratio with hydrocarbon potential energy on fault plane and combining net-to-gross ratio with fluid potential on top of sand bodies.It can be used to define the scope of preferential hydrocarbon accumulation in this mode.Its application in the 1

member of Nantun Formation (K

) within a local structure of Bei’er Sag

Hailar Basin

reveals that hydrocarbon migration in the reservoir could be divided into two modes:the mode of vertical migration and the mode of vertical migration followed by lateral migration.There are 17 preferential migration pathways for the former and 11 for the latter.Correspondingly

their scopes of preferential hydrocarbon accumulation are within 2.3 km and 1km respectively

just coinciding with the practical hydrocarbon distribution.It demonstrates that this method is feasible for determining preferential pathways in hydrocarbon migration within a lower source rock-upper reservoir combination

and conducive to delineating the scope of petroliferous region in the reservoir.In conclusion

it is of importance to guide future petroleum exploration.