Geology Characteristics of Chang-7 Reservoir of Yanchang Formation in Xiasiwan Oil field
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摘要: 下寺湾油田长7油层浊积砂体连片分布，储层物性较好，形成较好的储集体，其上长64—长63泥岩与凝灰质泥岩发育，形成良好的区域及其局部的盖层。长7底部油页岩为优质烃源岩，有机质丰度高，有机质类型为Ⅰ型（腐泥型）-Ⅱ1（腐殖-腐泥型）；长7油层生储盖匹配良好，形成自生自储式复合油藏（岩性、裂缝油藏），连通孔隙及砂体叠置点、裂缝为油气进行运移的重要通道。延长组长7油层是鄂尔多斯盆地东南部继延长组长6、长2外新的勘探领域，具有良好的勘探前景。Abstract: Turbidite sand body distributed all over in Chang-7 reservoir of Xiasiwan oil field. The reservoir physical property is good enough to form a better reservoir body. Mudstone and tuff development in Chang-64 and Chang-63 formed a good cover for the area. The bottom oil shale of Chang-7 reservoir is high-quality hydrocarbon source rocks with abundant organic matters, which are Type I (sapropel type) -Type Ⅱ1 (humic-sapropelic type); the perfect source-reservoir-cap matching of Chang-7 reservoir lead to the formation of composite oil reservoir(lithology and fracture reservoir) with its source and reservoir in the same coal seam. Connecting pores, superimposed points of sand bodies, and cracks are important channels for oil-gas migration. Except for Chang-6 and Chang-2 reservoir, Chang-7 reservoir is a new exploration area in southeastern Ordos basin, and has promising exploration prospect.
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Keywords:
- reservoir characteristics /
- Chang-7 reservoir /
- Xiasiwan /
- Ordos basin
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