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Relationship between water-rock interaction and petroleum accumulation: A case from unconformity, Junggar Basin, NW China

机译：水岩相互作用与石油成藏的关系：以不整合为例，中国西北准Jung尔盆地

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摘要

An important unconformity between Jurassic and Cretaceous Periods developed in the central Junggar Basin. The chemical index of alteration (CIA) values indicate that it experienced physical weathering during development, transported the matrix offthe semi-weathering rock, and consequently improved the reservoir quality of sandstone. Water with organic acids that are generated during organic matter maturation could dissolve the feldspar in semi-weathered zone, and would remove the dissolved products from the sandstone.All these would further improve reservoir quality. The semi-weathered zone of J/K unconformity became the preferred pathway for petroleum migration due to these two geological processes. The Paleo-soil layer on the top of the J/K unconformity formed a good trap for the passing hydrocarbons, and accumulate it to become a commercial petroleum pool.
机译：准gar尔盆地中部发育侏罗纪和白垩纪之间的重要不整合面。化学变化指数（CIA）值表明它在发育过程中经历了物理风化作用，将基质从半风化岩石中运出，从而改善了砂岩的储层质量。有机物成熟过程中产生的含有机酸的水可以溶解半风化带中的长石，并从砂岩中去除溶解的产物，所有这些都将进一步改善储层质量。由于这两个地质过程，J / K不整合的半风化带成为石油迁移的首选途径。 J / K不整合面顶部的古土壤层形成了一个很好的圈闭通过碳氢化合物的陷阱，并将其积累成为商业石油库。

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