石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (5): 1089-1097.doi: 10.11743/ogg20210507
收稿日期:
2021-03-25
出版日期:
2021-10-28
发布日期:
2021-10-26
作者简介:
张亚雄(1983-), 男, 博士、高级工程师, 石油地质。E-mail: Received:
2021-03-25
Online:
2021-10-28
Published:
2021-10-26
摘要:
鄂尔多斯盆地延长组7段(长7段)为典型的湖相沉积。在鄂尔多斯盆地中部地区,由于靠近湖泊的边缘,长7段泥页岩厚度偏薄,针对该地区的烃源岩研究尤其是泥岩的研究薄弱。基于15口探井开展了暗色泥岩的甄别工作并进行了采样,然后运用岩心观察、有机碳测定、岩石热解、色谱-质谱等分析手段,全面获得了暗色泥岩的烃源岩特征参数。研究表明,长7段暗色泥岩发育于弱还原-弱氧化的沉积环境。暗色泥岩的有机质丰度高,TOC平均值2.39%;有机质以Ⅱ2型和Ⅲ型为主;生烃潜力好,S1+S2平均值7.65 mg/g;热演化适中,Ro平均值0.98%。暗色泥岩的生烃量总计7.93×108 t,排烃量总计3.37×108 t,残留烃量总计4.56×108 t,综合排烃效率42.50%。暗色泥岩与页岩对研究区油气资源的贡献比为1:1.8。长7段暗色泥岩的生烃有机质包括陆源性输入来源和水体有机质来源。
中图分类号:
表1
鄂尔多斯盆地中部长7段暗色泥岩排烃特征"
深度/m | 排烃率/ (mg·g-1) | 密度/ (g·cm-3) | 暗色泥岩厚度/ m | 排烃强度/ (104 t·km-2) | 单层排烃 效率/% | 面积/km2 | 残留烃量/ (108 t) | 排烃量/ (108t) |
1 250 | 0 | 2.53 | 1.0 | 0 | 0 | 88 | 0.53 | 0 |
1 450 | 120 | 2.53 | 3.0 | 36.43 | 20 | 79 | 1.15 | 0.29 |
1 650 | 150 | 2.53 | 2.0 | 30.36 | 25 | 95 | 0.86 | 0.29 |
1 850 | 270 | 2.53 | 1.5 | 40.98 | 45 | 123 | 0.62 | 0.50 |
2 050 | 330 | 2.53 | 2.0 | 66.79 | 55 | 137 | 0.75 | 0.92 |
2 250 | 390 | 2.53 | 2.0 | 78.94 | 65 | 115 | 0.49 | 0.91 |
2 450 | 450 | 2.53 | 1.5 | 68.31 | 75 | 68 | 0.15 | 0.46 |
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