The Analysis of Controlling Factors on Sandstone Diagenesis and Porosity Preservation of Lower Juarassic in Tugerming Anticline,Kuqa Forland Basin
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摘要: 从沉积、构造和热背景剖析了库车前陆地区吐格尔明背斜下侏罗统砂岩的成岩作用及孔隙发育的控制因素，认为砂岩粒径、热成熟度和构造应力是其成岩作用及孔隙发育的3个主要控制因素。但前两个因素不是背斜南翼砂岩压实较弱、孔隙保存较多，北翼砂岩压实强、孔隙保存少的重要因素；构造应力场才是导致这种显著差异的主控因素，声发射岩石古构造应力测试结果表明该背斜南、北翼之间下侏罗统砂岩受到的最大水平构造应力的差值为72.2 MPa，其减孔量差值达7.6%。
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关键词:
- 砂岩成岩控制因素构造应力库车前陆地区
Abstract: The article studies on controlling factors of lower Juarassic sandstone diagenesis and porosity preservation in Tugerming Anticline of Kuqa foreland basin from the geological backgrounds of deposit, structure and themal current,and suggests that sandstone granular diameter, themal maturation and structure stress are three main controlling factors of sandstone diagengsis and porosity preservation.But the front two controlling factors are not important ones which resulted in the smaller sandstone compaction and more pore preservation in the southern wing of Tugerming anticline,and stronger sandstone compaction and smaller pore preservation in northern wing of Tugerming anticline. Further research shows that it was the Paleostructure stress that produced the most important effect on sandstone compaction and pore preservation because there was 72.2 MPa Paleotectonic stress differential tested by AE acoustic emission which could decreased 7.6 % of sandstone porosity between the northern and southern wing.-
Key words:
- sandstone diagengsis
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