摘要
采用地震和钻测井资料,将上泥盆—下石炭划分出了7个三级层序,反映了两次大的海平面变化旋回,上泥盆统为陆相沉积体系,早石炭发生大规模海侵,形成海相碳酸盐岩沉积。发育上泥盆统湖相和下石炭统海相多套烃源岩,有机质丰富较高,烃源岩已进入高成熟阶。上泥盆统冲积扇、扇三角洲和辫状河三角洲的河道砂体及下石炭统台地边缘礁滩复合体,台内点礁为最有利储层;分布两套膏盐岩及多套泥岩/泥灰岩盖层;生储盖具有良好的组合关系,形成自生自储式和下生上储式两种组合类型。天然气通过不整合面、断层、裂缝和储层组成的输导体系进行运移,泥盆统和下石炭统成藏模式有着明显不同,上泥盆统以远源成藏为主,近源成藏为辅;而下石炭统主要为近源成藏。
In the light of seismic data and well logs, the results show that seven three-order sequences can be divided from upper Devonian to lower Carboniferous and there are two-stage cycles of sea level. The Upper Devonian is a continental sedimentary system. Large-scale transgression occurred in early carboniferous, forming Marine carbonate deposits. The main source rocks are upper Devonian lake mud and lower Carboniferous carbonate, organic matters are rich, and the source rocks have been matured. Channel sandbodies of alluvial fan, fan delta and braided river delta of Upper Devonian, and reef-shoal complexes and patch reefs of Lower Carboniferous platform margin are the most favorable reservoirs. There are two sets of gypsum rock and several sets of mudstone/marl cap beds. Source rocks, reservoir and seal rocks form a good relationship in time and space. There are two types of combination: self-generated self-stored type and bottom-generated up-stored type. Natural gas migrated through the migration pathways composed by unconformity, faults, fractures and reservoirs. The accumulation patterns of Devonian and Lower Carboniferous are obviously different. The upper Devonian series is dominated by remote source accumulation, while the near source accumulation is supplemented. The Lower Carboniferous is mainly near source.
出处
《地球科学前沿（汉斯）》
2023年第2期167-177,共11页
Advances in Geosciences
