Evaluation on Source Rocks in the Jurassic Sequence Stratigraphic Frameworks of the Junggar Basin, China

LIU Luo fu; KANG Yong shang; QI Xue feng; TANG Yong; XIONG Zheng xiang

The source rocks in the Jurassic sequence stratigraphic frameworks of the Junggar basin were evaluated in detailin thispa -per. The results showed that the most Jurassic samples belong to poor -medium source rocks, and the hydrocarbon generation conditions of Badaowan Formation are better than those of Sangonghe Formation. In a sequence, the organic carbon abundance of condensed section is obviously higher than those of lacustrine transgressive system tract interval and high stand system tract interval, i. e., the condensed section is more favorable for hydrocarbon generation.The kerogen of Jurassic is mainly of type Ⅲ and Ⅱ ₂, with small amount of Ⅱ ₁.The Jurassic was not deposited in a typical coal -forming marsh environment, but mainly in fresh-water lacustrine shore -shallow lacus-trine -semi-deep lacustrine -deep lacustrine ones, with weakly reducing -strongly oxidizing geochemical conditions and evident pristane pre -dominance.The thermal maturity of the Jurassic is low and a little different in different areas, and most samples are at lower -mature stage presently (R _o =0. 50%～ 0. 80%), indicating that there is no large amount of normal liquid hydrocarbon generated from the Jurassic in the Basin.It is more realistic to seek for immature to lower -mature oil and gas generated from the Jurassic in the Basin.

1 Key Laboratory for Hydrocarbon Accumulation in Petroleum University,Ministry of Education, Changping, Beijing 102249;

2 Institute of Exploration and Development, Xinjiang Petroleum Administrative Bureau, Karamay, Xinjiang 834000;

3 Company of Well logging,Dagang Bureau of Petroleum,Tianjin 300280

Received Date: 2002-03-21

Rev Recd Date: 2002-05-16

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Abstract: The source rocks in the Jurassic sequence stratigraphic frameworks of the Junggar basin were evaluated in detailin thispa -per. The results showed that the most Jurassic samples belong to poor -medium source rocks, and the hydrocarbon generation conditions of Badaowan Formation are better than those of Sangonghe Formation. In a sequence, the organic carbon abundance of condensed section is obviously higher than those of lacustrine transgressive system tract interval and high stand system tract interval, i. e., the condensed section is more favorable for hydrocarbon generation.The kerogen of Jurassic is mainly of type Ⅲ and Ⅱ ₂, with small amount of Ⅱ ₁.The Jurassic was not deposited in a typical coal -forming marsh environment, but mainly in fresh-water lacustrine shore -shallow lacus-trine -semi-deep lacustrine -deep lacustrine ones, with weakly reducing -strongly oxidizing geochemical conditions and evident pristane pre -dominance.The thermal maturity of the Jurassic is low and a little different in different areas, and most samples are at lower -mature stage presently (R _o =0. 50%～ 0. 80%), indicating that there is no large amount of normal liquid hydrocarbon generated from the Jurassic in the Basin.It is more realistic to seek for immature to lower -mature oil and gas generated from the Jurassic in the Basin.

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Reference (3)

[1]	陈丽华,许怀先,万玉金.生储盖层评价[M].北京:石油工业出版社.1999[Chen Lihua, Xu Huaixian, Wan Yujin. Evaluation of Source Rock, Reservoir Bed and Cap Rock[M]. Beijing (in Chinese):Petroleum Industry Press.1999]
[2]	刘洛夫,妥进才,于会娟,陈践发,赵磊. 柴达木盆地北部地区侏罗系烃源岩的地球化学特征[J].石油大学学报(自然科学版),2000,24(1):64～68[Liu Luofu, Tuo Jincai, Yu Huijuan, Chen Jianfa, Zhao Lei, Geochemistry of the Jurassic Source Rocks in the Northern Areas of Qaidam Basin in China, Journal of the University of Petroleum[J]. China (Edition of Natural Science), 2000, 24(1) (Sum. No.117): 64～68 ]
[3]	于会娟,妥进才,刘洛夫,陈践发,赵磊. 柴达木盆地东部地区侏罗系烃源岩地球化学特征及生烃潜力评价[J]. 沉积学报,2000,18(1):132～138[Yu Huijuan, Tuo Jincai, Liu Luofu, Chen Jianfa, Zhao Lei, Geochemical Characteristics and Evaluation on Hydrocarbon Generation Potentials of Source Rocks in Jurassic, Eastern Qaidam Basin[J]. Acta Sedimentologica Sinica, 2000, 18(1): 132～138]

[1]	陈丽华,许怀先,万玉金.生储盖层评价[M].北京:石油工业出版社.1999[Chen Lihua, Xu Huaixian, Wan Yujin. Evaluation of Source Rock, Reservoir Bed and Cap Rock[M]. Beijing (in Chinese):Petroleum Industry Press.1999]
[2]	刘洛夫,妥进才,于会娟,陈践发,赵磊. 柴达木盆地北部地区侏罗系烃源岩的地球化学特征[J].石油大学学报(自然科学版),2000,24(1):64～68[Liu Luofu, Tuo Jincai, Yu Huijuan, Chen Jianfa, Zhao Lei, Geochemistry of the Jurassic Source Rocks in the Northern Areas of Qaidam Basin in China, Journal of the University of Petroleum[J]. China (Edition of Natural Science), 2000, 24(1) (Sum. No.117): 64～68 ]
[3]	于会娟,妥进才,刘洛夫,陈践发,赵磊. 柴达木盆地东部地区侏罗系烃源岩地球化学特征及生烃潜力评价[J]. 沉积学报,2000,18(1):132～138[Yu Huijuan, Tuo Jincai, Liu Luofu, Chen Jianfa, Zhao Lei, Geochemical Characteristics and Evaluation on Hydrocarbon Generation Potentials of Source Rocks in Jurassic, Eastern Qaidam Basin[J]. Acta Sedimentologica Sinica, 2000, 18(1): 132～138]

Evaluation on Source Rocks in the Jurassic Sequence Stratigraphic Frameworks of the Junggar Basin, China

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