车排子地区头屯河组古地貌与油气分布
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摘要
利用三维地震资料对头屯河组进行连井区域对比,分析车排子地区侏罗统头屯河组厚度变化和地层尖灭线位置。采用地层厚度法和层拉平方法研究头屯河组古地貌特征,分析古地貌构造单元。结合构造演化剖面和平面图分析古地貌演化和被改造后的特征。开展地震属性与沉积相分析,并结合井下岩性特征,分析古地貌对沉积和岩性的控制作用。车排子地区头屯河组古地貌呈坡—沟—隆—凹组合特征,斜坡的陡缓程度对沉积相的类型和岩性及其沉积物的粗细有一定的影响,沟谷既是输砂通道,也是聚砂的重要场所,现今砂体的分布与沟谷展布方向关系密切。结合古地貌、构造演化和沉积相特征分析了车排子地区头屯河组油气藏地质和分布特征,指出了该地区油气勘探方向。
By contrasting the 3-D seismic data of the well-tie area of Toutunhe Formation,we analyzed the stratigraphic thickness changes and the distribution of stratigraphic pinch-out line,and researched about palaeogeomorphology characteristics and structure unit with the method of stratigrapic thickness and seismic layer leveled.In addition,with tectonic evolution of the cross-section and plan analysis we explored palaeogeomorphology evolution and features after transformation.Then the analysis of the controlling role of palaeogeomorphology on deposition and lithology were made by taking into consideration seismic attribute,sedimentary facies and downhole lithology,for the purpose of finding out the sedimentary facies and reservoir lithological characteristics in this area.The palaeogeomorphology topography is characteristic of a combination of slope-ditch-upheaval -concave.Degree of slopes show certain effect on type of sedimentary facies,lithology and the sediments thickness. The valley is lose sand channel,and also an important place for poly sand;modern sand body distribution is closely related to valley spread direction.Based on the above analysis of geological characteristics and distribution of oil and gas reserve in Chepaizi area,the authors point out the favorable zones for exploration and development.
引文
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