中国陆上大中型气田形成的区域地质背景和科学探索井探索领域及目标

Medium-and Large-sized Gasfields in China's Mainland: Formation Process, Prospecting Areas and Profitable Targets

中国陆上含气盆地经历了复杂的构造沉积演化过程,主要受两个世代(古生代和中、新生代)、三大构造体系域(古生代的古亚洲构造体系域和中、新生代特提斯构造体系域、环西太平洋构造体系域)控制,它们决定了中国陆上含气盆地的形成和主要盆地类型;盆地类型和多阶段构造—沉积演化决定了中国陆上含气盆地具多套烃源岩、多套储盖层和多套储盖组合发育的特征。中西部与东部差异的天然气地质条件,以及中西部是大中型气田发育的有利地区,东部则是中小型气田或气田群发育区。中国陆上大中型气田具有与克拉通盆地、前陆盆地、断陷坳陷盆地和克拉通隆褶带有关的四大探索领域。中国陆上天然气科学探索井近期勘探主要包括高石梯构造、孤山构造、乌马营构造等六个有利目标。

the gas-bearing basins in China's Mainland have experienced extremely complicated evolutionary history of tectonic-sedimentation. The process were mainly controlled by two development stages, the Paleozoic and Mesozoic, as well as three structural system realm, the Paleozoic Asian realm, the Cenozoic Tethys realm and the Cenozoic Circum-West-Pacific realm. The two stages and the three tracts have decided the formation and main types of gas-bearing basin, resulting in a feature of multi-source rock, multi-reservoir, multi-seal and their multi-combination, and leading up to obviously different gas-geologic conditions between central-western China and eastern China. The central-western China is the profitable place to find medium-and large-sized gasfields, whereas the eastern China is the area to explore for small-and medium-sized gasfields.There are four kinds of basin expected to drill for medium-and large-sized gasfields, namely cratonic basin, foreland basin, faulted depression and cratonic rise-fold belt. Based on the above analysis, there are six target structures suggested to be drilled for exploration and research purpose including Gaoshiti, Gushan, Wumaying structures.