STUDY ON ACCUMULATION MECHANISM OF YA13-1 EFFICIENT NATURAL GAS RESERVOIR IN QIONGDONGNAN BASIN
琼东南盆地崖13―1高效天然气藏成藏机理研究

The accumulation environment of the efficient natural gas reservoirs are differ from large-medium sized, which require simultaneously efficient gas source rocks, accumulating process and energy match of reservoir rocks and cap rocks. Due to fast subsidence rate and great sediment thickness in Ya13-1 structure zone Qiongdongnan basin from Neocene to this day, the large area gas source rocks rapidly came into generation/migration phases. Universal dynamic overpressure afforded stronger power for liquid migration in 3D conduit system. The reservoir sandstones are normally-pressured and the cap rocks are overpressured, and such favorable energy match relation is very important for gas reservoirs conservation. Ya13-1 gas field is a late, overpressure, fast charge, 3D carrier and ideally energy match, efficient natural gas reservoir.