摘要
运用动态分析、综合研究方法及成盆、成烃、成藏理论,通过对该区沉积埋藏史、成烃史、成岩史、地热史的解剖,结合砂岩泥岩的压实特征、压力成因研究、包裹体等资料,对鄂尔多斯盆地上古生界压力演化及成藏过程进行了详细分析。认为鄂尔多斯盆地上古生界压力演化与成藏过程关系密切,压力作为天然气运移与成藏动力,对上古生界气藏成藏有着深刻影响。根据包裹体形成温度、压力和激光拉曼光谱组成分析研究资料,明确划分了不同类型气藏的成藏期次,提出了压力演化及成藏过程的3个关键阶段。即:埋藏加载增压原生气藏成藏阶段、剥蚀抬升卸载减压原生气藏成藏阶段、稳定调整减压次生气藏成藏阶段。强调早白垩世以后构造抬生剥蚀对上古生界气藏形成更为重要。同时指出,压力封存箱内非烃源泥岩、烃源岩、砂岩的地层压力形成与演化存在明显的差异,对上古生界各气藏的成藏过程有不同的影响。在对成压与成藏的6个过程详细描述的基础上,建立了鄂尔多斯盆地上古生界压力与成藏演化模式。
This article takes a dynamic analysis, comprehensive research and theory of basin forming, hydrocarbon generation and hydrocarbon accumulation. Through the detailed analysis about sedimentary burial history, hydrocarbon-generating history, diagenesis history, geothermal history and combining with the synthetic analysis on compacting characteristic of the sandstone and mudstone, history of pressure origin and inclusion analysis et al. Analyzing history of pressure origin and evolution and reservoir-processing in upper Paleozoic of ordos basin. From this article we think the relationship between history of pressure origin and evolution and reservoir-processing in upper Paleozoic of ordos basin, pressure as dynamic of gas migration and forming having great influence on gas pool forming in upper Paleozoic. Through analyzing of temperatures and pressure, laster Raman spectra, we compartmentalize pool forming period of different gas reservoir type, put forward three key phases about pressure evolution and reservoir-processing： forming primary gas reservoirs in loading pressure, burial stage; forming primary gas reservoirs in unloading and decompression, denudation of ascending stage; forming secondary gas reservoirs in adjusting and decompression, stabilization stage. The importance of tectonic uplift to gas pooling in upper Paleozoic after the K1 phase is especially emphasized. It is abvious differently forming pressure among nonsource rock, source rock and sand in pressure compartment, having different influence reservoir-processing in gas pool upper Paleozoic. Through particularly analyaing of six courses about forming pressure and reservoir, pressure and pooling evolution models are established in upper Paleozoic of ordos basin.
基金
国家973煤层气项目(2002CB211705)
关键词
能源科学技术
鄂尔多斯盆地
上古生界
压力演化与成藏关系
energy science and technology
Ordos Basin
Upper Paleozoic
the relation between history of pressure evolution and pooling
