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科技导报  2015 

临南洼陷营子街地区沙三下亚段油气富集主控因素

DOI: 10.3981/j.issn.1000-7857.2015.02.007, PP. 54-58

Keywords: 烃源岩超压,有效储层,富集规律,成藏模式,营子街地区,临南洼陷

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Abstract:

营子街地区临近洼陷的生烃中心,但由于构造简单,缺乏构造圈闭,传统上认为勘探潜力不大。为突破勘探瓶颈,从沉积演化、相带类型研究出发,在优势砂体类型、烃源岩压力及隐蔽圈闭的综合分析基础上,对营子街地区沙三下亚段油气成藏富集因素进行了研究。结果表明,营子街地区沙三下亚段沉积时期发育席状砂和浊积扇两类优势砂体,并夹持包裹于烃源岩中,形成了隐蔽型岩性油藏,其成藏富集因素主要受烃源岩超压和有效储层2个因素的控制,其中烃源岩超压控制了油气充满度,烃源岩超压区范围内有效储层的分布控制了含油规模,由此建立了自生自储-超压控藏型成藏模式。

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