重排藿烷参数示踪陇东地区油藏充注途径

doi:10.11743/ogg20170507

摘要/Abstract

摘要： 鄂尔多斯盆地陇东地区延长组长7油层组原油为弱氧化-还原、淡水-微咸水环境下低等藻类与高等植物混源生成，均为成熟-高成熟阶段，属于同一族群原油，且在平面上普遍分布。大部分学者都集中研究原油垂向运移成藏机理，但是对于平面上的充注运移机理则一直少有关注和研究。基于重排藿烷/藿烷（C₃₀^*/C₃₀H）比值的热稳定性，分析C₃₀^*/C₃₀H参数在表征石油充注运移方面的可行性，认为对于成熟-高成熟原油，C₃₀^*/C₃₀H值可能不仅仅是热成熟度的良好响应，对比C₃₀^*/C₃₀H参数与MDR参数（4-/1-甲基二苯并噻吩比值）、暴露/屏蔽烷基二苯并噻吩参数，发现C₃₀^*/C₃₀H参数与两参数都具有极好的正相关性，表明C₃₀^*/C₃₀H参数不仅是良好的热成熟度参数还是良好的石油充注运移参数。利用C₃₀^*/C₃₀H参数示踪陇东地区长7油层组的石油充注方向，发现华池地区为主要充注点，向西南、北东方向呈波阵面的方式充注运移，具有连续充注的特征。研究结果初步表明，C₃₀^*/C₃₀H参数是示踪石油充注途径的有效参数。

关键词: 重排藿烷/藿烷比值, 充注途径, 长7油层组, 陇东地区, 鄂尔多斯盆地

Abstract: Oil samples from the seventh member of the Yanchang Formation in Longdong area of Ordos Basin were found to be mature-highly mature crudes of a same family that were generated by mixed lower algae and higher plants under a weak oxidation-reduction and fresh-brackish water setting and were extensive in plane distribution.Most previous studies were focused on the vertical migration and accumulation of the crude,and the horizontal migration and charging of the oil was largely neglected.Based on the thermostability analyses of rearranged hopane (diahopane)/hopane (C₃₀^*/C₃₀H) ratios,we studied the possibility of using C₃₀^*/C₃₀H ratio to trace crude migration and charging and came with supportive results.The ratios of mature-highly mature crude were observed to be a biomarker not only for thermal maturity but also for crude migration and charging,as it shows a positive correlation with two other parameters:MDR and exposure/shielding alkyl dibenzothiophenes.By applying the ratio to trace the crude charging direction in the seventh member of the Formation,we found that the crude was migrating and charging continuously southwest-and northeast-ward in the modes of wavefront to Huachi area.The result verified the idea of using the ratio as an effective parameter for tracing oil charging pathways.

Key words: rearranged hopane/hopane ratio, charging pathway, seventh member of the Yanchang Formation, Longdong area, Ordos Basin

中图分类号:

TE122.1

李威,文志刚,徐耀辉,等. 重排藿烷参数示踪陇东地区油藏充注途径[J]. 石油与天然气地质, 2017, 38(5): 887-895. doi: 10.11743/ogg20170507 Li Wei,Wen Zhigang,Xu Yaohui,et al. Hydrocarbon charging pathway tracing with rearranged hopane parameters in Longdong area,Ordos Basin[J]. Oil & Gas Geology, 2017, 38(5): 887-895. doi: 10.11743/ogg20170507

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