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在综合分析钻井、地震、测井等资料的基础上,建立了南八仙构造模式,落实了整体构造形态。指出南八仙构造整体上为一个近东西向的被断层复杂化的背斜构造,在纵向上,深层是以仙南断层为代表的基底卷入式背冲断垒与断展褶皱相结合的构造样式,构造形态相对简单;浅层是以仙北断层为代表的盖层滑脱型构造样式,构造形态相对复杂。在横向上,构造西段为挤压冲断模式、构造中段为右旋走滑模式、构造东段为扭动拉张模式。分析研究表明,在燕山晚期至喜山早期形成的仙南断层与南八仙深层构造,与烃源岩生、排烃期配置良好,形成了E_3~1原生油气藏。喜山晚期形成的仙北断层,对原生油气藏起破坏作用,从而形成浅层次生油气藏。
Based on a comprehensive analysis of drilling, seismic and logging data, a structural model of the South Eight Immortals was established and the overall structure was implemented. It is pointed out that the structure of the South Waxian is an anaglyphic structure complicated by faults in the east-west direction in the whole. In the vertical and deep layers, the tectonic style , And its tectonic morphology is relatively simple. Shallow layer is a capstones slippery tectonic style typified by the Xianbei fault, and its tectonic morphology is relatively complicated. In the horizontal direction, the western section of the structure is the extrusion-thrusting mode, the middle section of the structure is the dextral strike-slip mode, and the eastern section is the torsional tensioning mode. The analysis shows that the Xiannan fault and the Nanbaxian deep structure formed from the late Yanshanian to the early Himalayan, and the source rocks and hydrocarbon expulsion periods are well-disposed, forming the E_3 ~ 1 primary oil and gas reservoir. The Xibei Fault formed in the late Himalayan period destructed the primary oil and gas reservoirs, forming shallow secondary oil and gas reservoirs.