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Geochemical Characteristics and Evaluation on Hydrocarbon Generation Potentials of Source Rocks in Jurassic Eastern Qaidam Basin

YU Hui juan 1 TUO Jin cai 2 LIU Luo fu 1 CHENG Jian fa 2 ZHAO Lei 3 1 (University of Petroleum Changping Beijing 102200) 2 (State Key Laboratory of Gas-Geochemistry Lanzhou Institute of Geology Chinese Academy of Science Lanzhou  
The geochemical characters of 13 Jurassic source rock samples in the eastern Qaidam basin are studied by means of Rock-Eval, GC MS, GC MS MAT and so on Based on the comprehensive analyses of the organic carbon content, the content and conversion ratio of organic matter, parameters of pyrolysis, organic petrology parameters, biomarker characters of saturated hydrocarbon and stable carbon isotope composition of individual hydrocarbon, the organic matter's abundance, type and maturity are studied, and the potential of generation hydrocarbon are evaluated. 1.Abundance of the organic matter The variety range of the organic carbon content is wide, which is 0.20%~42.41%. Of which, the coal samples' organic carbon content is bigger than shale samples'. And only 31% samples' organic carbon content is less than 1.0%.The variation range of the soluble organic matter's content and total hydrocarbon is 0.0045%~1.0326% and 12.1×10 6 ~5 443.9×10 6 respectively, only 53.8% samples' soluble organic matter content exceeds 0.015%, 46.2% samples' total hydrocarbon exceeds 50×10 6 , and have commonly low values. The conversion ratio of organic matter ("A"/TOC% and HC/TOC%) have also low values. Of which, the largest "A"/TOC% value is 4.20%, and only one sample's HC/TOC% is larger than 1.00%. 2.Type of the organic matter According to the result of pyrolysis analysis, the variety range of IH、IO and S2/S3 is 25~1 700mg/gTOC、4~1 350mg/gTOC and 0.29~42.96 respectively . According to the organic petrology analysis of the maceral the major part is vitrinite, ranging from 17% to 80%, averaging being 65%. The second part is inertinite, ranging from 16% to 81%, averaging being 27%. The smallest part is exinite, ranging from 25% to 21%, averaging being 8%. 3.Maturity of the organic matter Except three samples whose T max is above 512℃, all other samples' T max is 411~481℃,being the stage of lower-maturity to maturity. According to the vitrinite reflectance Ro, which is from 0.694 to 0.865, the organic matter is also lower-maturity to maturity stage, most of the source rocks being the highest stage of generating hydrocarbon. 4.Biomarker characteristics of saturated hydrocarbon The characteristic of normal alkane are, from the TIC, the saturated hydrocarbon's dominant form is latter single peak, part of them is double peak or front single peak , having common features with other coal-bearing sedimentary basin. The isoprene's characteristics are that, the Pr/Ph of 54% samples is more than 1.0, which show that the Jurassic source rocks are not completely from the typical marsh environment, but much like the lake-beach and shallow lake depositional environment. CPI and OEP of the source rocks are more than 1.0, of which, CPI from 1.19 to 2.62, OEP from 1.05 to 2.40. ∑C + 21 /∑C - 21 of the samples are lower. All these, on the one hand, show that the source rocks come from continental higher plants, on the other hand, show that the maturity of the source rocks is not high. The existence of bicyclic sesquiterpanes and diterpenoids show the source rocks have the characteristics of coal-measure formation.The characteristics of tricyclic terpanes and hopanes of Jurassic samples are the amount of the tricyclic terpanes is less than hopanes, in which, commonly C 29 and C 30 the is major part, C 27 (Tm or Ts) is second part, the C 32 + homohopanes' amount is low, and gammacerane can't be checked. The characteristics of steranes are that C 29 -steranes is major part, C 27 -steranes is second part, C 27 -steranes is lowest, which forming non-symmetrical V shape. The maturity parameters of steranes and hopanes doesn't reach the equilibrium point of evolution. 5.Stable carbon isotope of individual hydrocarbon: This feature is that δC 13 of the coal samples is high, ranging from -23.2‰ to -33‰, mostly in -24‰~-27‰. The δC 13 of shale and mudstone is less than coal samples, however, the δC 13 of shale and mudstone is bigger than other area
【CateGory Index】: P593
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