STUDIES OF ACCUMULATION STAGES OF SILURIAN GAS-BEARING RESERVOIRS IN WELL KONGQUE 1 IN THE TARIM BASIN

Oil and gas explorations in the northeast of Tarim Basin are quite successful recently with several commercial gas accumulations discovered in high and over-matured source region.The Kongque 1(Kq 1) Gas Field,situated in the Weimake-Kaiping Structural Belt of the Kongquehe Slope,is a representative gas accumulation.With applications of organic inclusions,accumulation stages of Silurian gas-bearing reservoirs in Well Kq 1 are determined.According to experiment results,charge history of Well Kq 1 can be divided into 2 stages.The first stage is the formation time of palaeo-petroleum reservoir in de-positional phase of late-Caledonian movement(350-365 Ma).The second stage is the gas formation time during tectonic uplifting stage(325-315 Ma).Gas is thermal cracked gas derived from palaeo-petro-leum reservoirs.Compared with accumulation time of Well Yingnan 2,formation time of Well Kq 1 is earlier.Late period accumulation characters in the Kongquehe area is not general.Different tectonic belts have different oil-and-gas accumulation histories.New cognitions about formation stages of oil-and-gas are important for further explorations in the Kongquehe area.