关键词: 陆相盆地, 高海拔地层, 超深层, 碎屑岩储层, 碳酸盐岩储层, 白云石化作用, 岩溶

Abstract:

There are the potential domains for oil and gas exploration in the areas with the elevation of 0~5 km and the deep formations of 5~10 km in depth, where some petroleum geology theories and technologies require to be studied. The modification effect and influence of the neotectonic movement on the oil-bearing formations and palaeo-reservoirs are more profound in the high-elevation areas such as Qiangtang Basin and the north part of Qinghai-Tibet area,so the preservation of oil reservoirs is rigorous.The burial depth of ultra-deep reservoirs is normally 5~10 km in the non-marine basins characterized with rapid deposition, thick sedimentary rock and multiple structural layers,which corresponds to the late stage of diagenesis and deep burial period (with temperature and pressure higher than 175℃ and 100MPa, respectively). The development of high-quality clastic reservoirs in ultra-deep formations of China is controlled by deposition, the duration of deep burial (long-term diagenesis and short-term deep burial), the pressurization of fluid and secondary dissolution. The generation of high-quality carbonates reservoirs in the deep and ultra-deep formations mainly depends on dolomitization and dolomite karst.

Key words: non-marine basin, high-elevation formation, ultra-deep formation, clastic reservoir, carbonate reservoir, dolomitization, karst