Secondary oil migration distance and hydrocarbon accumulation in carbonate rocks

Zhou Bo; Jin Zhijun; Yun Jinbiao; Bai Guoping

doi:10.11743/ogg20160401

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Secondary oil migration distance and hydrocarbon accumulation in carbonate rocks
Vol. 37, Issue 4, Pages: 457-463(2016)
Online First：08 August 2016，

Published：2016
DOI： 10.11743/ogg20160401
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DOI：

Zhou Bo, Jin Zhijun, Yun Jinbiao, et al. Secondary oil migration distance and hydrocarbon accumulation in carbonate rocks[J]. 2016, 37(4): 457-463. DOI： 10.11743/ogg20160401.

摘要

通过统计全世界主要含油气盆地229个碳酸盐岩大油气藏（田），分析油气藏（田）和油气二次运移的距离，发现在碳酸盐岩运移系统内，油气二次运移距离和油气田个数之间的关系曲线并没有碎屑岩中出现的指数衰减关系。其油气藏总体以近源成藏为主，但对于非近源运移的油气而言，油气运移的距离对油气成藏几率的控制作用并不明显。分析认为，对于碳酸盐岩非近源运移，油气往往受断裂展布特征和孔洞类储层的分布范围所控制，只要在这个范围内，油源足够的前提下，油气成藏的几率是相当的。因此，对于碳酸盐岩系统而言，只要在断裂和孔洞类储层的延伸范围内，即使在较远的距离条件下，仍然具有较高的大油气藏成藏几率。

Abstract

In this paper

we statistically analyzed the secondary hydrocarbon migration distances of 229 large carbonate oil and gas fields within the major petroliferous basins in the world.It is found that the secondary hydrocarbon migration distances and number of oil/gas fields within carbonate migration systesms show no exponential decay relationship as the clastic migration systems.Carbonate reservoirs are generally proximal to source rocks.However

for reservoirs distal to source rocks

the migration distance has no obvious control on the probability of hydrocarbon accumulation.For reservoirs distal to source rocks

oil and gas distribution are generally controlled by the distribution pattern of faults and the distribution range of carbonate reservoirs of vuggy-cavernous type.Given sufficient hydrocarbon supply

the possibility of hydrocarbon accumulation remains almost consistent with such a range.Therefore

even at a long distance

as long as it is within the distribution range of faults and reservoir rocks of the vuggy-cavernous type

the probability of hydrocarbon accumulation can be relatively high.