Qin Jianzhong. DISTRIBUTIONS OF THE MAIN MESOZOIC HYDROCARBON SOURCE ROCKS IN THE QIANGTANG BASIN OF THE QINGHAI-TIBET PLATEAU[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2006, 28(2): 134-141. doi: 10.11781/sysydz200602134
Citation: Qin Jianzhong. DISTRIBUTIONS OF THE MAIN MESOZOIC HYDROCARBON SOURCE ROCKS IN THE QIANGTANG BASIN OF THE QINGHAI-TIBET PLATEAU[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2006, 28(2): 134-141. doi: 10.11781/sysydz200602134

DISTRIBUTIONS OF THE MAIN MESOZOIC HYDROCARBON SOURCE ROCKS IN THE QIANGTANG BASIN OF THE QINGHAI-TIBET PLATEAU

doi: 10.11781/sysydz200602134
  • Received Date: 2005-09-23
  • Rev Recd Date: 2006-01-05
  • Publish Date: 2006-03-28
  • Qiangtang Basin in Qinghai-Tibet plateau is a Mesozoic marine residual basin.Geologic survey and analysis of the hydrocarbon source rock samples show that there are four hyddrocarbon source rocks longitudinally developing in T3x,J2b,J2x and J3s formations in Qiangtang Basin.The main hydrocarbonsource rocks in the different depressions or sags are different.The hydrocarbon source rocks develop in J3s,J2b and J2q-T3x formations in the east of South Qiangtang Depression and in J2x,J2b and T3x formations in the centre and west of South Qiangtang Depression.In North Qiangtang Depression,the hydrocarbon source rocks develop in T3x and J2b formations in the east and in J2x,T3x,J2b and J3s formations in the west.The thicknesses of the effective Jurassic muddy hydrocarbon source rock and carbonate hydrocarbon source rock are generally 100 to 500 meters and 200 to 600 meters,respectively.There are hydrocarbon-rich rocks with 200 to 400 meters thick devceloping in J2x and J3s formations.The thickness of the good-quality hydrocarbon source rock developing in T3x formation is generally 500 to 700 meters.And in North Qiangtang Depression,100 to 300 meters thick of good-quality hydrocarbon sourck rock developing in T3x formation.The maxima of residual TOC of the J2x shale,J3s marl and T3x shale are 4.15%,1.26% and 1.5%,respectively.However,the values of residual TOC of the J2x gray and gray-green mudstone as well as J3s and J2b limestone are mostly less than 0.5% and 0.2%, respectively.The value of residual TOC of the T3x marine shale is generally in the range of 0.5% to 1%.

     

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