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鄂尔多斯盆地姬塬地区延长组长2沉积相研究
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摘要
鄂尔多斯盆地姬塬地区油气资源丰富,勘探程度相对较低,油气勘探潜力很大。本文综合姬塬地区野外露头剖面、岩心以及各项地质基础资料,综合运用地层学、沉积学、储层地质学等理论和方法,进行地层划分,沉积相类型识别,沉积相带与砂体展布,储层物性等方面研究,通过该研究对鄂尔多斯盆地姬塬地区延长组长2油层组沉积相有了更加深入的认识。
     通过寻找区域对比标志层,采用旋回控制,厚度参考等方法,将姬塬地区延长组长2油层组自下而上划分为长23、22、21三个油层,并建立多个纵横方向连井剖面进行地层对比。
     姬塬地区长2油层组沉积相类型主要为三角洲沉积相,发育三角洲平原分流河道微相、分流间湾、决口扇等微相。其中分流河道砂体是长2储集层的骨架砂体。砂体的发育完全受沉积相的展布控制,均呈北东-南西方向条带状展布。
     研究区储集层性能与分布均受沉积相的控制。延长组砂岩具有粒径细,低成份成熟度和较高结构成熟度等特点,属中孔低渗至低孔低渗储层。除沉积相控制因素,成岩作用过程中产生的各种溶蚀孔隙对改善储层物性贡献较大。三角洲沉积相在垂向和平面相变剧烈,导致研究区储层层间和层内非均质性明显。
     鄂尔多斯盆地延长组为大型内陆湖泊沉积,频繁的湖进湖退,为形成良好的生、储、盖空间组合提供了条件。三角洲平原分流河道砂体是油气有利储集体。综合沉积相带和砂体展布、构造特征和储层物性等多方面因素分析,优选出延长组长2油层组有利勘探区,为下一步勘探开发提供地质依据。
The Jiyuan area of Ordos basin, which possesses abundant resources but lower exploration degree, has bright prospect in oil and gas exploration.
     By collecting data about outcrop, core, and many other elementary geological data ,at the same time using sedimentary analyses and geological analyses, in the thesis ,sequence division were applied, type of sedimentary facies were identified, the extension of sand bodies, distributing of sedimentary facies and physical property of reservoir were studied .Sedimentary facies of the chang2 oil-bearing beds of Yangchang Formation in Jiyuan is realized by the research above. Finally the favorable area were found out.
     Based on the primary marks of contrast in region , stratum of the Chang2 oil-bearing beds of Yangchang Formation in Jiyuan area are divided into Chang23,Chang22,Chang21from lower to upper. Five connecting-well section are built which to contrast the stratum.
     The study showed ,delta sedimentary facies is main sedimentary facies of the Chang2 oil-bearing beds in Jiyuan area and the deltaic plain distributery channel sand body is good reserveoir. The sand bodies distributed from northeast to southwest dominated by sedimentary facies.
     Reservoir properties and distribution are mainly controlled by sedimentary facies. Because of simple configuration, gentle structure, the effect of the tectonic movement is relatively limited. The result indicates the characteristics of the Reservoir petrology are lower mineral maturity and high structure maturity. The physical property represent that Chang 2 is middle pore and low permeability or low pore and low permeability
     The soure rock and the distribution of the centre of oil generation well relate with the distribution of deep lake in research area. The favorable source-reservlir-caprock group can be formed for the frequency of lacustrine treansgression and regression . The favorable area can be found out in Chang2 oil-bearing beds of Yanchang Formation by the analysis of sedimentary facies , the distributing of sand body, the character of structure and the property of reserveoir ,etc.
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