A preliminary study on the relationship between deep-sourced materials and hydrocarbon generation in lacustrine source rocks: An example from the Permian black rock series in Jimusar sag,Junggar Basin
Liu Yi-Qun1, Zhou Ding-Wu2, Jiao Xin1, Feng Qiao2, Zhou Xiao-Hu1
1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China; 2 College of Earth Science & Engineering,Shandong University of Science and Technology,Qingdao 266590,China
Abstract The black rock series of the Permian Lucaogou Formation are an important hydrocarbon source rocks in northern Xinjiang. In Jimusar Sag,this suite of rock series is mainly distributed at a depth of 3000-3500 m,and it can be divided into two tight oil reservoirs of 3100~3170 m and 3250~3370 m. The lithology of the two black rock series is mainly tuff,tuffite and tuff micritic dolomite,with rich lamellar,lenticular asphaltene and algae. Further study showed that the black rock series not only developed tuff deep source materials,but also contained abundant hydrothermal deep source materials,most of which were interbedded with microbial dolomite and formed a set of special hydrocarbon source rocks with good hydrocarbon generation ability. Pyrolysis analysis of black rock series samples shows that the free hydrocarbon S1 content is high(the highest is 8.17 mg/g,and 1.56 mg/g on average),and the cracked hydrocarbon S2 content is also high(3.3~76.2 mg/g). TOC is 1.4%~7.9%,and the potential hydrocarbon generation is also high(0.02~0.51,0.16 on average),indicating high abundance of organic matter and good hydrocarbon generation potential. The content of sterane in biomarkers C28 and C29 is greater than that in C27,showing an inverse “L” type,indicating that algae and higher plants were the main types of organic matter. The maturity parameters C29 20S/(20S+20R)and C29 ββ/(αα+ββ)are high in the deep source materials rich layers(mean 0.48 and 0.31),and low in the deep source materials few layers(mean 0.37 and 0.26). In the two tight oil reservoirs,RO value is high when tuff material is abundant. Comprehensive analyses indicate that frequent volcanic eruptions and the deep source materials from hydrothermal are involved in hydrocarbon generation of lacustrine sedimentary source rocks.
Fund:Financially supported by the National Natural Science Foundation of China (Nos. 41572086,41802120)
About author: Liu Yi-Qun, born in 1951,Ph.D.,is a professor of the Geology Department of Northwest University.Now she is engaged in sedimentary and oil and gas reservoir research.E-mail: liu-yiqun@263.net.
Cite this article:
Liu Yi-Qun,Zhou Ding-Wu,Jiao Xin et al. A preliminary study on the relationship between deep-sourced materials and hydrocarbon generation in lacustrine source rocks: An example from the Permian black rock series in Jimusar sag,Junggar Basin[J]. JOPC, 2019, 21(6): 983-998.
Liu Yi-Qun,Zhou Ding-Wu,Jiao Xin et al. A preliminary study on the relationship between deep-sourced materials and hydrocarbon generation in lacustrine source rocks: An example from the Permian black rock series in Jimusar sag,Junggar Basin[J]. JOPC, 2019, 21(6): 983-998.
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