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鄂尔多斯盆地陕北地区中生界三叠系延长组发育大型三角洲体系,形成了两套有利的生储盖组合,并发育多套油层。勘探实践证明:油藏的形成和分布受延长组生油凹陷的控制,三角洲储集砂体是形成大型油田的物质基础,次生浊沸石溶解在低渗透背景上形成相对高渗区,储油砂体上倾岩性变化构成隐蔽性岩性圈闭遮挡条件,形成的三角洲油藏具有规模大、工业产层多、油气资源丰富的特点。通过对鄂尔多斯盆地陕北地区石油成藏地质条件进行分析,总结出岩性油藏的成藏特征及勘探方法,深化和丰富了岩性油藏勘探理论,推动了陕北地区三角洲油藏的勘探步伐。
Ordos Basin Northern Shaanxi Triassic Yanchang Formation Mesozoic large-scale delta system developed two sets of favorable reservoir-cap combination and the development of multiple sets of reservoirs. Exploration proved that the formation and distribution of reservoirs are controlled by the oil sags in the Yanchang Formation. The delta-bearing sand bodies are the material basis for the formation of large-scale oilfields. The secondary lazuli zeolites dissolve on the relatively low permeability background to form relatively high permeability zones, and oil storage The change of lithology of the sand body constitutes a concealed lithologic trap occlusion condition, and the delta reservoir formed has the characteristics of large scale, industrial production layers and rich oil and gas resources. Based on the analysis of the geological conditions of oil accumulation in the northern part of Ordos Basin, the reservoir forming characteristics and exploration methods of lithologic reservoirs are summarized, the exploration theory of lithologic reservoirs is deepened and enriched, and the exploration of deltaic reservoirs in northern Shaanxi is promoted pace.