后者以二辉石岩为代表，具典型堆积结构，与本区尖晶石二辉橄榄岩相比，具有较高的稀土元素丰度。

The latter is representive of pyroxenite, which displays the accumulate texture and has higher REE abundance than the Sp-lherzolite from the region.

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第二是以源岩评价代替对有效烃源岩的评价，致使有效烃源岩厚度、有机质丰度以及有效烃源岩品质评价过高。

Second, source rock evaluation instead of effective source rocks evaluation, which results in overvalued thickness and quality of effective source rock and abundance of organic matter.

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碳酸盐岩有机质丰度较低，具有一定的生烃能力，但厚度较小，分布局限，生烃潜力不大。

Carbonate with lower organic abundance can generate certain hydrocarbon, yet has poor generation potential with less thickness and limited distribution.

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