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科技导报  2014 

东濮凹陷三叠系致密砂岩储层裂缝与油气成藏

DOI: 10.3981/j.issn.1000-7857.2014.22.010, PP. 62-66

Keywords: 东濮凹陷,纯裂缝型储层,油气成藏

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Abstract:

根据露头、岩心、薄片观察、成像测井、声发射实验、包裹体测温、原油族组成、原油组分碳同位素分析等技术,在分析裂缝分布特征和成藏特征的基础上,探讨了东濮凹陷北部三叠系裂缝形成期次与油气成藏的匹配关系。研究认为,研究区以构造裂缝为主。裂缝及其溶蚀孔洞的孔隙度平均为2.25%,渗透率为40×10-3μm2左右,是主要的储集空间和渗流通道。三叠系致密砂岩储层裂缝主要分两期形成,分别为燕山运动期和喜马拉雅运动期。三叠系储层油源为古近系沙三段和沙四段烃源岩,其生烃高峰期主要为东营组沉积末期-馆陶组沉积时期(晚期裂缝形成时期),而造成三叠系砂岩致密的压实、胶结等成岩作用主要在新生代以前完成。油气生成时期与喜马拉雅期有效裂缝的形成时间匹配良好,而与基质孔隙的发育匹配关系较差,从而造成研究区裂缝含油,砂岩的基质孔隙基本不含油。

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