泌阳凹陷页岩油富集及可动性探讨

doi:10.11743/ogg20190608

摘要/Abstract

摘要： 中国陆相页岩油资源丰富，但近年来的开发实践并没有取得预期的效果。针对这一问题，本文应用显微镜薄片观察、岩石热解、低温氮气吸附、页岩油吸附实验、高压压汞和核磁共振等实验对泌阳凹陷页岩油富集及可动性主控因素进行了研究。结果表明：页岩油富集层段TOC含量较高，无机大孔隙较为发育。页岩油富集时饱和烃含量较高，沥青质含量较低，由此页岩油的可动性较好。粘土矿物是页岩比表面积的主要贡献者，是页岩油吸附的主要载体，粘土矿物含量越低，页岩油的可动性越好。泌阳凹陷纵向上页岩油富集的最佳深度为2 800 m，页岩油在3 000 m以深API度较高，粘度较低，具较好的可动性。泌页HF1井、安深1井深度为2 400~2 500 m，还未达到页岩油富集、可动的最佳深度段，不利于页岩油的开采。高温条件下小分子烃吸附能力较弱，深层（3 000 m以深）是该区未来的有利勘探目标。泌阳凹陷地层压力系数较小，高声波时差主要是高TOC的反映。

关键词: 可动性, 储集能力, 油气富集, 页岩油, 泌阳凹陷, 南襄盆地

Abstract: China is rich in continental shale oil resources,but no substantial breakthrough has been made in their deve-lopment over recent years.In view of the issue,various data including thin section observation,rock pyrolysis,low-temperature nitrogen adsorption (LTNA),shale oil adsorption experiment,high pressure mercury injection (HPMI) experiment,and nuclear magnetic resonance (NMR) are integrated to investigate the major factors controlling shale oil accumulation and mobility in Biyang Depression.The results show that the TOC of shale interval enriched with oil is relatively higher,and its inorganic macropores are well developed.The shale reservoir enriched with oil is usually characterized by higher content of saturated hydrocarbon and lower content of asphaltene,so the shale oil has higher mobility.Clay minerals are the main contributor to the specific surface area of shale and the main carrier for shale oil adsorption.Thus,the lower the clay mineral content,the better the mobility of shale oil.The optimal depth for shale oil enrichment is 2 800 m in Biyang Depression.When the burial depth exceeds 3 000 m,the shale oil has a higher API degree and lower viscosity,thus fair mobility.The depth of Wells HF1 and Anshen1 is in the range from 2 400 m to 2 500 m,being shallower compared with the optimal depth for shale oil production.In addition,the adsorption capacity of small molecular hydrocarbons is relatively weaker under high temperature,so the deep intervals (over 3 000 m in depth) are the play fairway for petroleum exploration in the area.The pressure coefficient of Biyang formations is relatively small,and the higher interval transit time mainly indicates higher TOC.

Key words: mobility, reservoir capacity, hydrocarbon enrichment, shale oil, Biyang Depression, Nanxiang Basin

中图分类号:

TE122.3

冯国奇,李吉君,刘洁文,等. 泌阳凹陷页岩油富集及可动性探讨[J]. 石油与天然气地质, 2019, 40(6): 1236-1246. doi: 10.11743/ogg20190608 Feng Guoqi,Li Jijun,Liu Jiewen,et al. Discussion on the enrichment and mobility of continental shale oil in Biyang Depression[J]. Oil & Gas Geology, 2019, 40(6): 1236-1246. doi: 10.11743/ogg20190608

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