青藏高原地面露头样品风化校正研究

STUDY ON THE WEATHERING CORRECTION OF SURFACE OUTCROP SAMPLES FROM THE QINGHAI-TIBET PLATEAU

在大量地面与井下、地表下样品对比实验的基础上 ,作者指出地表风化作用主要对烃源岩有机质丰度产生严重影响 ,不同岩性、不同参数样品的风化程度存在着明显差别 ,并提出了青藏高原地面样品的有机碳风化校正系数 ,同时指出可溶有机质如沥青“A”、总烃、热解游离烃S1 和裂解烃S2 以及热解IH影响很大 ,无法进行风化校正 ,还探讨了地表风化作用对有机质丰度影响的主要控制因素。

Based on the comparison experiments of a large number of surface, downhole and subsurface samples, the authors pointed out that surface weathering mainly has serious impacts on the organic matter abundance of hydrocarbon surce rocks, and the weathering degrees of samples with different lithology and different parameters are significantly different. In this paper, some weathering correction coefficients of organic carbon for the surface samples from the Qinghai Tibet Plateau are suggested. In is indicated that the effects on soluble organic matter such as bitumen 'A', total hydrocarbon, pyrolysis free hydrocarbon S 1 and cracking hydrocarbon S 2 as well as pyrolysis IH are great, thus they are difficult to be corrected.Also, some primary control factors about the impacts of surface weathering on organic matter abundance are discussed.