石油与天然气地质 ›› 2025, Vol. 46 ›› Issue (5): 1392-1409.doi: 10.11743/ogg20250502
• 油气地质 • 上一篇
吴伟涛1,2,3(
), 李天宇1, 闫新智4, 周凯4, 殷露1, 曹磊1,2,3
收稿日期:2025-07-05
修回日期:2025-08-29
出版日期:2025-10-30
发布日期:2025-10-29
第一作者简介:吴伟涛(1983—),男,博士、副教授、硕士研究生导师,油气成藏地质学、非常规油气地质与勘探。E-mail: wtwu@xsyu.edu.cn。
基金项目:
Weitao WU1,2,3(
), Tianyu LI1, Xinzhi YAN4, Kai ZHOU4, Lu YIN1, Lei CAO1,2,3
Received:2025-07-05
Revised:2025-08-29
Online:2025-10-30
Published:2025-10-29
摘要:
多源供烃条件下的致密油富集规律研究是油气富集理论的重要内容。以鄂尔多斯盆地定边—富县地区延长组长8油层组(长8)致密油藏为研究对象,综合运用钻井、测井、岩心、薄片、地球化学、试油及试采等资料,系统评价了长7油层组(长7)张家滩页岩、长9油层组(长9)李家畔页岩以及长8泥页岩的烃源岩生烃潜力,明确了致密油藏的基本特征,探讨了不同成藏组合下的致密油富集因素,并建立了相应的富集模式。研究结果表明:①定边—富县地区发育长7、长9和长8等3套好-优质烃源岩,以长7底部张家滩页岩生烃潜力最优,总有机碳含量(TOC)平均值为6.1%,呈大面积分布;长9顶部李家畔页岩和长8泥页岩次之,TOC平均值分别为5.3%和3.9%,分布在甘泉—富县—志丹地区。②长8储层岩性为细砂岩和粉砂岩,其实测孔隙度主峰为4.0% ~ 12.0%,平均值为7.9%,实测渗透率主体为(0.10 ~ 0.40) × 10-3 μm2,中值为0.26 × 10-3 μm2,属于致密储层。该区致密砂岩油藏多呈透镜状、成带成群分布,表现出准连续聚集特征。③长81油层亚组(长81)的致密油油藏富集主要受长73油层亚组(长73)烃源岩供烃能力、源-储之间的薄泥岩厚度和强底板的封堵作用控制,成藏组合以“源上储下”类长73单源直接型最优,其次为“源夹储”类长73+长82油层亚组(长82)双源型组合,而“源夹储”类长73+长91油层亚组(长91)双源型组合较差。长82油藏的致密油富集则主要依赖于长91烃源岩、优质储层条件和盖层的封堵作用控制,其成藏组合以“源下储上”类长91单源直接型最好,其次为“源夹储”类长91+长82双源型组合。④长8油藏发育3种致密油富集模式,分别为定边—吴起地区的长81“强源-强封”高效型富集模式、甘泉—富县地区的长82“优源-优储-优盖”互补型富集模式和志丹地区的长8“多源-优储”协同型富集模式。旨在深化致密油富集理论的同时,有助于长8致密油的高效勘探与开发。
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