辽东湾海域古近系沙河街组钙质砂岩成因机制和控制因素
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韩雪芳(1984—),女,山东平阴人,工程师,硕士,从事油气田开发地质方面的研究。联系电话:13920208564,E-mail:hanxf@cnooc.com.cn。

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国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”(2016ZX05058-001)。


Genetic mechanism and controlling factors of calcareous sandstone of the Paleogene Shahejie Formation,Liaodong Gulf
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    摘要:

    辽东湾海域古近系沙河街组具有丰富的油气资源,是中深层油气藏勘探开发的重要方向。J油田为辽东湾海 域典型的中深层油藏,已钻探的开发井普遍钻遇钙质砂岩,极大影响储层品质,制约油田开发效果。根据岩心、薄 片、扫描电镜及钻井、测井资料,对J油田沙二段钙质砂岩的成因机制及控制因素进行研究。结果表明:钙质砂岩的 形成和展布受沉积作用和成岩作用的共同影响。受砂岩顶、底部泥岩成岩作用影响,钙质砂岩具有粒度细、含油性 差、物性差、密度高等特点。受沉积作用影响,在垂向上,砂岩的沉积厚度和沉积韵律控制碳酸盐胶结的类型和发 育部位;平面上,沉积相带和泥岩厚度影响钙质砂岩的平面展布和胶结强度。基于研究区沙一段泥岩和沙二段砂 岩平面分布特征,预测沙二段钙质砂岩平面展布规律,认为砂岩厚度相对较薄、泥岩厚度相对较大的湖盆中央为研 究区钙质砂岩发育带,其储层品质受钙质砂岩发育程度影响。

    Abstract:

    The Paleogene Shahejie Formation in Liaodong Gulf area is rich in oil and gas resources,which is an important target for exploration and development of middle-to-deep hydrocarbon reservoirs. J Oilfield is a typical middle-to-deep hydrocarbon reservoirs in Liaodong Gulf. The calcareous sandstone was drilled by development wells there,which affected the quality of reservoirs and restricted the effect of oil field development. Based on the core,thin section,SEM,drilling and logging data,the characteristics and genetic mechanism of calcareous sandstone and its controlling factors of the second member of Shahejie Formation in J oilfield were discussed. The results show that the formation and distribution of calcareous sandstone are affected by both sedimentation and diagenesis. The calcareous sandstone is characterized by fine granularity,low oil saturation,poor physical property and high density,which is resulted from the diagenesis of shale at the top and bottom of the sandstone. Affected by the sedimentation,the type and vertical position of carbonate cementation are controlled by the sediment thickness and rhythm of sandstone,while the sedimentary facies and mudstone thickness affect the horizontal distribution and cementation degree of the calcareous sandstone. Based on the horizontal distribution characteristics of the mudstone in the first member and the sandstone in the second member of Shahejie Formation,the horizontal distribution of the calcareous sandstone in the second member of Shahejie Formation was predicted. The center of the basin,characterized by thin sandstone and thick mudstone,is the favorable development area of calcareous sandstone and its development degree controls the quality of reservoirs.

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韩雪芳,刘宗宾,李云鹏,文佳涛,王腾.辽东湾海域古近系沙河街组钙质砂岩成因机制和控制因素[J].油气地质与采收率,2018,25(5):65~71

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  • 在线发布日期: 2018-09-13