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为了认清鄂尔多斯盆地志丹探区西南部三叠系延长组长4+5段有利储层的分布规律,通过大量岩石薄片和铸体薄片的镜下鉴定,并结合扫描电镜、阴极发光和X-衍射等测试结果,研究了该区长4+5段主要成岩作用及其对储层物性的影响。研究结果显示,长4+5段主要成岩作用类型有压实作用、胶结作用和溶蚀作用;强烈的压实作用及胶结作用导致其原生孔隙丧失殆尽,成为形成特低孔渗储层的主要原因,而晚期较弱的溶蚀作用,对储层的改善发挥了较大作用,从而使鄂尔多斯盆地延长组发育部分有利储层,形成较好的储集-成岩相带。
In order to understand the distribution of favorable reservoirs in 4 + 5 sections of Triassic Yanchang Formation in the southwestern part of Zhidan exploration area in the Ordos Basin, through the microscopic identification of a large number of thin sections of rock and cast thin sections, combined with scanning electron microscopy, cathodoluminescence and X - diffraction and other test results. The main diagenesis in section 4 + 5 of this area and its effect on reservoir physical properties were studied. The results show that the main types of diagenesis in Chang 4 + 5 have compaction, cementation and dissolution; the strong compaction and cementation lead to the depletion of their primary porosity and the formation of extra-low porosity and permeability reservoirs However, the later weaker dissolution has played a significant role in the improvement of reservoirs, resulting in the development of some favorable reservoirs in the Yanchang Formation in the Ordos Basin and the formation of better reservoir-diagenetic facies belts.