| 柴北缘牛东地区古近系/侏罗系不整合结构特征及其控油气作用 |
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| 关键词:Niudong area Lower Jurassic unconformity migration and accumulation pattern |
| 基金项目:国家油气重大专项资助(编号: 2016E-0106GF) |
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| 摘要: |
| Structural Characteristics and Hydrocarbon Control Action of Paleogene/Jurassic Unconformity in Niudong Area,North Margin of Qaidam Basin |
| Based on the comprehensive analysis of the outcrop observing, drilling core, 3D seismic, well logging, thin section and physical property data, the type and structure characteristics of unconformity and physical property change law of unconformity structure and its connectivity in the upper Jurassic in the Niudong area were comprehensively studied. The results show that the unconformity is mainly truncated unconformity, and fault-fold unconformity and parallel unconformity are distributed in the local area in Niudong area. The unconformity is widely distributed in the study area, and it has typical three-layer structures: the rocks above the unconformity, weathered clay horizons and semi-weathered rocks; the three-layer structures of unconformity have different characteristics of the lithology and logging. The basal conglomerates above the unconformity surface is stable in distribution and thick in thickness, and has no good caprocks. It belongs to the “dispersive” migration channel.The weathered clay layer under the unconformity surface is the sealing layer due to poor physical properties. The physical characteristics of semi-weathered rocks under unconformity surface have obvious regularity. According to its changing trend, it is divided into two sections. Oil and gas are mostly distributed in sandstone layers with better reservoir performance at the bottom of the upper segment. According to the oil source, fault, unconformity and its distribution with oil and gas, the unconformity-fault step-shaped oil-gas migration and accumulation pattern is constructed in Niudong area. |
| REN Chang-qing,GAO Xian-zhi,ZHANG Yong-shu,WANG Bo,HOU Ze-sheng,HE Fu-gui,ZHANG Tao.2019.Structural Characteristics and Hydrocarbon Control Action of Paleogene/Jurassic Unconformity in Niudong Area,North Margin of Qaidam Basin[J].Acta Geoscientica Sinica,40(6):795-804. |
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