东营凹陷盐家地区沙四段上亚段砂砾岩体岩石结构特征
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作者简介:王蓬(1980—),男,湖北监利人,工程师,从事地球物理技术的研究与应用。联系电话:13954656933,E-mail:wangpeng873.slyt@sinopec.com。

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国家科技重大专项“济阳坳陷油气富集机制与增储领域”(2011ZX05006-003),国家自然科学基金项目“断陷湖盆陡坡带近岸水下扇沉积成因模式及其规模量化预测”(41102058)


Rock texture characteristics of sandy conglomerate in the upper fourth member of Shahejie Formation in Yanjia area,Dongying sag
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    针对东营凹陷盐家地区沙四段上亚段近岸水下扇砂砾岩体内部结构特征认识不清的问题,在岩心精细观察描述的基础上,将东营凹陷盐家地区沙四段上亚段近岸水下扇砂砾岩体划分为11种岩相类型和13种岩相组合单元,并将其岩石结构类型归纳为3大类6小类。运用岩心刻度成像测井技术,建立典型岩相成像测井图版。以常规测井曲线重构岩性识别曲线,利用岩心、成像资料进行精细标定,建立典型岩石结构类型的岩性识别曲线量化识别模式;并运用该方法对盐家地区单井岩石结构特征进行测井识别,分析连井剖面的砂砾岩体岩石结构纵向展布特征,建立近岸水下扇不同亚相岩石结构垂向叠置模式。分析认为单期次砂砾岩体垂向为泥石流沉积、洪水沉积、正常牵引流沉积叠置的有序沉积旋回,向盆地方向呈楔形展布,纵向上向边界断层方向持续后退。

    Abstract:

    The internal texture characteristics of sandy conglomerate have not been understood clearly in the nearshore subaqueous fan of the upper fourth member of Shahejie Formation(Es4s)in Yanjia area,Dongying sag. Based on core delineation,the sandy conglomerate bodies are divided into 11 types of lithofacies as well as 13 types of lithofacies assemblages of Es4s in the area. The rock textures are summarized into three categories and six subcategories. Formation MicroScanner Image(FMI)chart modes of typical lithofacies are established according to core type recognition. The lithology identify curve(LIC)can be reconstituted by conventional logging data,which is calibrated by core and FMI to be used to establish LIC quantitative standards of typical rock textures. The rock texture types of a single well were identified by this method in Yanjia area. Longitudinal distribution of rock texture of sandy conglomerate was analyzed based on well-connecting profile.The vertical superposition modes of rock texture in different subfacies of the nearshore subaqueous fan were established.The analysis suggests that single stage sandy conglomerate deposit is a sequential combination of mudslide deposit,flood deposit and tractive current deposit vertically which extends towards the basin in a wedge shape and constantly retrogradestowards the boundary fault vertically.

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王蓬,王艳忠,操应长,马奔奔,齐明明.东营凹陷盐家地区沙四段上亚段砂砾岩体岩石结构特征[J].油气地质与采收率,2015,22(3):34~41

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  • 在线发布日期: 2015-06-03