石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (1): 98-107.doi: 10.11743/ogg20110112

• 石油与天然气地质 • 上一篇    下一篇

黄骅坳陷沙河街组一段下亚段混合沉积成因类型及演化模式

  

  • 出版日期:2011-02-28 发布日期:2011-04-28

Genetic types and evolutionary model of mixed clasticcarbonate deposits in the lower part of the Sha-1 Formation, the Huanghua Depression

  • Online:2011-02-28 Published:2011-04-28

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被引次数

58

摘要：

渤海湾盆地黄骅坳陷沙河街组一段下亚段广泛发育碎屑岩与碳酸盐岩的混合沉积，但由于目前对于混合沉积的研究程度较低，难以界定沉积相及油藏分布范围、成藏要素及分布规律等一系列问题。为此采用了沉积微相精细研究技术，在工区层序地层格架建立的基础上，综合研究了混合沉积的岩石学特征、成因类型、演化模式及层序地层格架对混合沉积分布的控制作用。研究认为，该区混合沉积大致分为4种类型：母源混合、相缘渐变混合、原地混合和重力流混合沉积。混合沉积在低位体系域最为发育，高位和湖侵体系域混合沉积作用受到抑制。黄骅坳陷沙河街组一段下亚段是一个典型的现代混合沉积实例。该研究结果可为进一步的勘探和开发提供新的思路和依据。

关键词: 关键词：层序地层格架, 成因类型, 演化模式, 混合沉积, 沙河街组, 黄骅坳陷, 渤海湾盆地

Abstract:

This paper makes a study of the mixed clasticcarbonate deposits widely distributed in the lower part of the 1st member of the Shahejie Formation, Huanghua Depression. Since there is little research on this kind of mixed deposits, it is hard to identify sedimentary facies, reservoir distribution, poolforming elements and their distribution patterns. Therefore, by examining sedimentary microfacies and based on the sequence stratigraphic framework of the study area, we made a comprehensive study of petrologic features, genetic types and evolutionary patterns of mixed clasticcarbonate deposits and the controlling effect of sequence stratigraphic framework on their distribution. According to this study, we recognize four types of mixed deposits: parent material mixing, mixing due to gradual facies change, insitu mixing and gravity flow mixing. The mixed deposits are highly developed in lowstand system tract, but poorly developed in highstand and transgression system tracts. The lower part of the 1st member of the Shahejie Formation, Huanghua Depression, is a typical example of modern mixed clasticcarbonate deposits. Results from this study can provide thoughts and foundations for further exploration and development in the study area.

Key words:  , Key words：sequence stratigraphic framework, genetic type, evolutionary pattern, mixed clasticcarbonate deposit, Shahejie Formation, Huanghua Depression,Bohai Bay Basin