Lateral Structure Compression and Its Influence on Sandstone Diagenesis—A Case Study from the Tarim Basin
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摘要: 从塔里木盆地库车坳陷下侏罗统和西南坳陷白垩系的构造样式、古构造应力值与砂岩成岩压实作用之间相互关系的研究 ,明确提出了构造侧向挤压对砂岩成岩压实有重要的影响 ,它造成的压实减孔量可以是砂岩总压实减孔量的 2 .5 %～ 2 3.6 %。库车坳陷克孜勒努尔 -乌恰沟地区为断层转折褶皱 ,其南翼为高构造应力带、变形强烈 ,它引起的构造挤压减孔量为 5 .6 %～ 6 .6 % ,占总压实减孔量的 17.6 %～ 2 3.6 % ;而吐格尔明地区为断层传播褶皱 ,其南翼的构造变形较弱 ,构造挤压减孔量仅 1.9%～ 2 .1%。西南坳陷七美干地区位于逆冲推覆构造带的中带 ,构造挤压减孔量为 4.9% ,占总压实减孔量的 17.6 % ;而位于前锋带的同由路克地区受构造侧向挤压作用的影响很小。Abstract: The article presents the viewpoint that lateral structure compression had an important effect on sandstone diagenetic compaction through the study on the relationship amoang the structure deformation,paleostructure stress and sandstone diagenetic compaction of lower Jurassic of Kuqa depression and Cretaceous of Xinan depression in Tarim Basin.The porosity loss caused by lateral structure compression was 2.5%～23.6% percentage of bulk porosity loss of sandstones. The porosity loss to structure compression of Kezilesuer and Wuqiaguo areas were 5.6%～6.6% and 17.6%～23.6% percentage of bulk porosity loss of sandstones because of heavy structure deformation,and one of Tugeerming area was 1.9%～2.1% owing to weak structure deformation in Kuqa depression.Qimeigan area in Xinan depression, located in the middle belt of thrust nappe,had porosity loss to structure compression of 4.9% and 17.6% percentage of bulk porosity loss of sandstones,and Tongyouluke area, located in the front belt of thrust nappe, was very small porosity loss to structure compression.
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Key words:
- sandstone compaction /
- structural compression /
- Tarim basin
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