深层复杂储集体优质储层形成机理与油气成藏——以济阳坳陷东营凹陷古近系为例

发布时间：2018-05-24 02:21

本文选题：次生孔隙 + 溶蚀　；参考：《石油与天然气地质》2016年04期

【摘要】：综合运用岩心观察、薄片分析、岩石物性测试、同位素测试以及试油、试采结果分析等方法,对济阳坳陷东营凹陷古近系深层复杂储集体优质储层形成机理与油气成藏过程进行了研究。研究表明,酸-碱流体交替溶蚀作用形成的次生孔隙在一定程度上改善了深层局部储层物性,是深层优质储层形成的关键。深层不同层序沉积物原始组分、流体环境、源-储配置等条件的不同,使优质储层的形成机理存在差异。初始裂陷层序河流-冲积扇红层优质储层发育于碱性环境,且与烃源岩侧向接触,不仅发生大量的长石和碳酸盐岩溶蚀,石英也发生强烈的溶蚀。扩展裂陷层序陡坡扇三角洲、水下扇砂砾岩优质储层与烃源岩呈指状接触,且通过控盆断层与深部碱性流体沟通,主要表现为长石和碳酸盐岩溶蚀,石英只是局部少量溶蚀。扩展裂陷层序滩坝砂和浊积岩优质储层大部分分布于烃源岩中,主要表现为长石和碳酸盐岩的溶蚀。缓坡断阶带处于流体优势运移通道,与烃源岩对接的红层优质储集有利于成藏。陡坡带扇根遮挡的扇中砂砾岩优质储层有利于油气成藏。处于生烃增压烃源岩中,发生成岩耗水的滩坝砂和浊积岩优质储层有利于成藏。
[Abstract]:Comprehensive use of core observation, thin slice analysis, rock physical properties testing, isotopic testing and oil testing, production test results analysis, etc. The formation mechanism and hydrocarbon accumulation process of high quality reservoirs in Paleogene deep layer in Dongying depression of Jiyang depression were studied. The results show that the secondary pores formed by alternate dissolution of acid-base fluids improve the physical properties of deep local reservoirs to a certain extent and are the key to the formation of deep high quality reservoirs. The formation mechanism of high quality reservoirs is different due to the difference of the original composition, fluid environment, source-reservoir configuration and so on. The primary rifting sequence fluvial and alluvial fan red beds developed in alkaline environment and have lateral contact with source rocks. Not only a large number of feldspar and carbonate dissolution occurred but also strong dissolution occurred in quartz. The spreading rifting sequence steep slope fan delta, the high quality reservoir of underwater fan sand gravel and the source rock are in finger contact, and communicate with the deep alkaline fluid by controlling the basin fault, the main manifestation is feldspar and carbonate rock dissolution, quartz is only a small amount of local dissolution. The high quality reservoirs of extended rifting sequence beach bar sand and turbidite are mostly distributed in source rocks, mainly represented by dissolution of feldspar and carbonate rocks. The gentle slope fault terrace is located in the dominant channel of fluid migration, and the red reservoir interfacing with the source rock is favorable for reservoir formation. The high quality sandstone and conglomerate reservoir with fan root occlusion in steep slope zone is favorable for oil and gas accumulation. In hydrocarbon-generating pressurized source rocks, the high quality reservoir of diagenetic and water-consuming beach bar sand and turbidite is favorable for reservoir formation.
【作者单位】：中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05006-003)
【分类号】：P618.13

【相似文献】