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渤海湾盆地车镇凹陷古近系构造样式对沉积及储集层的影响*

DOI: 10.7605/gdlxb.2008.03.007, PP. 277-285

Keywords: 渤海湾盆地,车镇凹陷,古近系,构造样式,砂砾岩,沉积,储集层

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Abstract:

近年来,构造对沉积的控制作用研究成为当前国际地质和油气勘探研究中的一个热点,但构造对储集层质量影响的研究相对较缺乏。在对车镇凹陷构造、沉积、储集层研究的基础上,讨论了不同构造样式中沉积充填和储集层发育特征。构造样式对沉积充填类型及特征具有重要影响,其中板式构造样式区仅发育近岸水下扇及少量滑塌浊积扇;铲式构造样式区除在边界断裂根部附近发育近岸水下扇外,其前端湖底扇常较发育;断阶式和坡坪式构造样式区受次级断裂控制,陆上与水下沉积常常共生,沉积类型多样,从冲积扇、扇三角洲到近岸水下扇、湖底扇均可发育。构造样式通过影响砂砾岩体的垂向叠置方式、规模和沉积类型及砂体结构,最终影响了其储集层质量。综合研究认为,断阶式和坡坪式构造样式区沉积类型丰富,为有利储集层最发育区;铲式构造样式区湖底扇发育,砂砾岩单层薄,为次级有利区;而板式构造样式区砂砾岩展布窄、单层厚度大,储集层质量最差。该认识为中低勘探程度的含油气断陷盆地中优质储集层发育带的预测提供了思路。

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