碳酸盐岩油气二次运移距离与成藏  

Secondary oil migration distance and hydrocarbon accumulation in carbonate rocks

作　　者：周波[1] 金之钧[1] 云金表[1] 白国平[2] 

机构地区：[1] 中国石化石油勘探开发研究院100083 [2] 中国石油大学 北京,北京102249

出　　处：《石油与天然气地质》2016年第4期457-463,共7页Oil & Gas Geology

基　　金：国家科技重大专项(2011ZX05005-01-03);国家基础研究发展计划(973计划)项目(2012CB412800)

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。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 dis-tances 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 distribu-tion range of carbonate reservoirs of vuggy-cavernous type.Given sufficient hydrocarbon supply,the possibility of hydro-carbon 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 accumula-tion can be relatively high.

关 键 词：运移距离 二次运移 碳酸盐岩 油气成藏 

分 类 号：TE122.3[石油与天然气工程—油气勘探]