鄂尔多斯盆地胡尖山地区长4+5～长6油层组裂缝发育特征及对原油运聚的控制作用  

Characteristics of Fracture Development and Its Control over Oil Migration and Accumulation of Chang4+5-Chang6 Oil Formation in Hujianshan Area of Ordos Basin

作　　者：范泓澈[1] 黄志龙[1] 高岗[1] 沈霞[2] 吴海瑞[2] 

机构地区：[1]中国石油大学(北京)资源与信息学院油气资源与探测国家重点实验室,北京102249 [2]中石油吉林油田分公司勘探开发研究院,吉林松原138000

出　　处：《石油天然气学报》2011年第1期11-16,164,共6页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(2007CB209503)

摘　　要：鄂尔多斯盆地胡尖山地区长4+5和长6油层组原油分布极为复杂,地球化学特征显示研究区主要存在3种不同类型的原油,以A类原油分布范围最广,油源对比证明该类原油主要来自下部长7油层组烃源岩。因此,在研究区典型的低幅度构造背景下,寻找沟通源岩与上覆储层的输导通道,是探寻该区油气富集规律的关键。大量的岩心、成像测井资料显示:尽管研究区的断裂较少,但高角度的半开启-开启性裂缝发育,裂缝面含油特征明显,沿裂缝面,原油具有明显的运移过程。同时,发现研究区裂缝的分布范围、走向与基底断裂诱导作用具有密切的关系。裂缝对原油运聚的控制作用主要表现为:裂缝的发育不仅可以改善储层的渗流能力,同时,也可以与其他输导体系相匹配成为原油垂向运移的重要通道。裂缝的分布范围与原油含油范围对应关系良好,在裂缝分布区附近的储层有利于原油的富集成藏。The distribution of crude oil in Chang4+5 and Chang6 Oil Formations was very complicated in Hujianshan Area of Ordos Basin,the geochemistry characteristics indicated that there existed three types of crude oils in the studied area,of which type A oil was widely distributed and it was demonstrated by contrast that the oil was mainly derived from the source rock in Chang 7 Formation.It was shown through correlation between crude oil and hydrocarbon source rock that finding the migration pathway between source rock and reservoir was the key to search the regularity of oil enrichment and accumulation.Based on the study of fundamental data of cores and image logging,it shows that though there are less faults and high angle and semi-open-open fractures are grown,and there indicates apparent oil characters in fracture surface,oil migration is obvious along the fractures.At the same time,it is found out that the fracture distribution range and its orientation are closely related with the induction of fundamental fracturing.The control of fracturing on oil migration presents that the fracture growth can not only improve reservoir permeability ,but also provide an important conduction channel for vertical oil migration by matching with other conduction systems.There exists a good relationship between the fracture distribution range and oil distribution.The reservoirs near the fracture area are favorable for oil enrichment and accumulation

关 键 词：胡尖山地区 裂缝系统 油气运聚 分布规律 垂向输导 

分 类 号：P618.13[天文地球—矿床学]