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随着全球页岩气等非常规油气勘探的不断加强,烃源岩排气效率的研究越来越受到关注。根据页岩或煤中实测或理论计算的含气量数据,以及在不同热演化阶段的生气量,探讨了不同母质类型烃源岩在不同热演化阶段的排气效率。煤系烃源岩和海相Ⅰ—Ⅱ1型烃源岩排气效率随着成熟度的增加,排气效率逐渐增加,但两者存在很大的差异,煤系烃源岩排气效率很高,在RO=1.0%时为75%,在RO=5.5%时高达90%以上,高排气效率表明,煤系烃源岩生成的天然气绝大部分都运移到了储层,成为常规天然气和致密砂岩气的主要气源。与煤系烃源岩相比,海相Ⅰ—Ⅱ1型烃源岩排气效率较低,大部分低于70%,低排气效率结果表明,在页岩体系中生成的天然气相当一部分仍滞留在烃源岩中,残留在页岩中的天然气为页岩气的富集提供了物质基础。
With the continuous enhancement of unconventional oil and gas exploration such as global shale gas, more and more attention has been paid to the research on the discharge efficiency of source rocks. According to measured or theoretical gas content data in shale or coal and gas generation in different thermal evolution stages, the exhaust efficiency of source rocks of different parent material types at different thermal evolution stages is discussed. Exhaust efficiency of coal-derived source rocks and marine source rocks of type Ⅰ-Ⅱ1 increases with the increase of maturity, but there is a great difference between the two. Coal-derived source rocks have high exhaust efficiency , 75% at RO = 1.0% and over 90% at RO = 5.5%. The high exhaust efficiency indicates that most of the natural gas generated from coal-derived source rocks is transported to the reservoir to become conventional natural gas and The main gas source of tight sandstone gas. Compared with the coal-based source rocks, the discharge efficiency of the marine source rocks of type Ⅰ-Ⅱ1 is lower, mostly less than 70%. The results of low-emission efficiency show that a considerable part of the natural gas generated in the shale system still remains In the source rock, the natural gas remaining in the shale provides the material basis for the enrichment of shale gas.