Characteristics of biomarker in source rocks of Linxi Formation in Taohaiyingzi region, Zhalute basin
Tóm tắt
Based on gas chromatography and gas chromatography mass spectrometry techniques, the authors researched biomarker characteristics of the Linxi Formation source rocks in the area of Taohaiyingzi, and analyzed the information and petroleum geological significance that were indicated by source of organic matter, sedimentary environment, maturity and so on. Gas chromatography peak of saturated hydrocarbons from Linxi Formation source rocks showed “the former peak” of the single peak distribution and the C23-dominant main peak. This indicates that the main source of organic matter was mixed organic matter; Pr/Ph ratios ranged from 0.3 to 0.6, indicating a strongly reducing sedimentary environment. Molecular fossil assemblages in Linxi Formation source rocks were abundant in tricyclic terpane with long side chains, had high level of gammacerane, and showed dominant distribution of C27 steranes. Gammacerane ratios range from 0.15 to 0.29, with an average of 0.19, implying that Linxi Formation hydrocarbon source rocks were formed in the environment of micro-saltwater water to half-saltwater water. The hopanes/steranes ratios are mainly between 0.6 and 1.0, with an average of 0.84, implying that bacteria and algae had almost the same contribution to organic matter. C27 steranes abundance is high and the ratio of C27 steranes/C29 steranes is 1.13, showing that algae is the main source of hydrocarbon precursors.
Tài liệu tham khảo
Beaumont EA, Foster NH (2002) Exploration of hydrocarbon traps. Petroleum Industry Press, Beijing, pp 22–54 (in Chinese)
Hou D, Feng Z (2011) Petroleum geochemistry. Petroleum Industry Press, Beijing, pp 201–242 (in Chinese)
Huang WY, Meinschein WG (1978) Sterols are ecological indicators [J]. Geoshimica et Cosmochim Acta 43:739–745
Li F, Qu X, Liu L (2009) Sedimentary Environment on upper permian linxi group in inner Mongolia. Acta Sedimentol Sin 27(2):265–272
Lu S, Zhang M (2008) Petroleum Geochemistry. Petroleum Industry Press, Beijing, pp 201–212 (in Chinese)
Peters KE, Moldowan M (1993) The biomarker Guide: interpreting molecular fossils in petroleum and ancient sediments. Prentice Hall Inc., New Jersey
Projects Foundation: the investigation of land and resources by china geology survey, fundamental geology investigation of petroleum in the deep and peripheral of Songliao Basin (1212010782001)
Tang Y, Chen J (2011) Characteristic of molecular fossils of the Lower Carboniferous source rocks in Kushuigou area of Ejina Banner, Inner Mongolia, China. Geol Bull China 30(6):888–894 (in Chinese)
Wang Y, Lu Z et al (2011) Characteristics of source rocks from Carboniferous-Permain in Songliao Basin and its peripheral area, northeastern China. Geol Bull China 30(2/3):214–220 (in Chinese)
Zhang L, Huang D, Liao Z (1999) Gammacerane geochemical indicator of water column stratification. Acta Sedimentol Sin 17:136–140 (in Chinese)
Zhang X, Zhou J, Chi X et al (2008) Late paleozoic Tectonic-sedimentation and petroleum resources in northeastern China. J Jilin University (Earth Sci Edit) 38(5):719–725 (in Chinese)
Zheng Y, Chen S, Huang X et al (2013) New fossil discovery along the section of Linxi Formation at Taohaiyingzi in Ar Horqin Banner Inner Mongolia. Geol Bull China 32(8):1269–1276 (in Chinese)