THE STUDY OF MAIN CONTROL FACTORS OF GAS ACCUMULATION IN THE YINGJISU SAG OF TARIM BASIN

Through the studying of the structure background,source rocks,reservoirs and seals and preservation in the Yingjisu Sag in the east of Tarim Basin,the geologic conditions and main control factors of the accumulation are discussed.There are favorable conditions for accumulation in the Yingjisu Sag.Because of the evolvement characteristics of source rocks,the traps in Mesozoic groups accumulate mainly gas.It is the particular history of tectonic evolution and characteristics of accumulation that determine faults from Palaeozoic to Mesozoic are the crucial control of Mesozoic groups accumulation.Meanwhile,effective caprocks and paleouplifts are also the main controls.