| 摘要: |
| 应用有机地球化学、高分辨率层序地层学和成藏动力学等研究方法，对博兴洼陷古近系沙四上亚段和沙三段 两套烃源岩的油气成藏的差异性进行了研究。结果表明，虽然沙四上亚段和沙三段油气藏类型均为自生自储型的 岩性或构造-岩性油气藏，但是它们在烃源岩特征、储层特征、成藏机制和油气藏特征等方面存在着明显的差异。研 究区沙四上亚段成藏组合的烃源岩有机质顺层富集,异常压力较高，多为微裂缝幕式排烃,排烃效率高,在洼陷中心 及南斜坡有利圈闭位置处分别形成泥页岩裂缝型油气藏和滩坝型构造-岩性油气藏。而沙三段成藏组合的烃源岩有 机质较分散,局部富集，异常压力相对较低，主要依靠差异突破压力进行排烃,排烃效率较低,油气藏类型主要为滑 塌浊积型岩性油气藏，其次为三角洲前缘型构造-岩性油气藏和火山岩遮挡型油气藏。 |
| 关键词: 博兴洼陷 沙四上亚段 沙三段 储集层特征 油气藏类型 成藏差异性 |
| DOI： |
| 分类号: |
| 基金项目:中石化集团公司重点科研项目(P02060) |
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| Otherness on pool-forming in the upper E2s4 and E2s3 of Palaeogene in Boxing subsag |
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SU Yong-jin1,2,JIANG You-lu1,FANG Xin-na2,SONG Jian-yong3,SHI Shi-ge3
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(1. Faculty of Geo-Resource and Information in China University of Petroleum, Dmgying 257061，Shandong Province, China;2. Shengli Vocational College, Dongying 257097, Shandong Province, China;3. Chunliang Oil Production Plant of Shengli Oilfield Limited Company, Boodng 256504, Shandong Prxrvince, China)
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| Abstract: |
| Two sets of oil-bearing series, the upper E2S4 and E2S3 of Palaeogene in Boxing subsag, were studied by adopting organic geochemistry, high-resolution sequence stratigraphy and pool-forming dynamics. The results indicate that there is noticeable otherness in the characteristics of source rock, reservoir rxDck and forming mechanism of oil pools, though reservoir types both of them are all lithologic or structural-lithologic. For the upper E2S4 source rock, there are some typical characteristics ，including richness in organic matter along the formation bedding, higher formation pressure, more efficient hydrocarbon expulsion by microfractures. The shale-cracked pools and the structural-lithologic pools of beach-dam can be formed respectively in the center and the south slope of the sag. But in the E2S3，the characteristics of source rock are distracting organic matter, only partly enrichment, lower formation pressure and less efficient hydrocarbon expulsion, which depends on differential breakthrough pressure. The lithologic pools of slip-turbidite are in a majority, the structural-lithologic pools of delta front and the lava-screened pools are in a minority. |
| Key words: Boxing subsag upper E2S4 E2S3 ? reservoir characteristics reservoir types otherness on pool-forming |
