华北南部地区石炭—二叠系勘探前景分析

华北南部地区虽然经历了复杂构造—沉积演化,但通过对区内石炭—二叠含煤层系埋藏结构和生烃演化类型的分析认为,该区石炭—二叠系具备较好的烃源物质基础。其中,中构造层(三叠系、侏罗—白垩系)的原始沉积厚度相对较小、新生代沉积厚度较大的3层埋藏结构和晚期生烃型的部分凹陷,具备喜山期"二次生烃"形成煤成气的潜力,有较好的勘探前景。结合该区石炭—二叠含煤层系煤成气成藏特点提出了评价原则,优选了有利的勘探靶区并提出了勘探部署建议。

Exploration prospects of the Carboniferous and Permian in the southern North China

Based on the study of the covered structures and analysis of the hydrocarbon evolution types in coal-bearing strata of southern North China, it was showed that there was good hydrocarbon source in the Carboniferous-Permian sequence. The thickness of original middle layer in coal-bearing strata, the Triassic and Jurassic-Cretaceous, was relatively thin. Some Neogene sags showed favorable potential such as three covered structures and late hydrocarbon generation. The coal-forming gas accumulation could be formed in the secondary hydrocarbon generation of Himalayan stage, so it was showed the good exploration prospects in southern North China. Based on the coal-forming gas accumulation features, the evaluation principle was proposed and some gainful exploration targets were evaluated.