吉木萨尔凹陷二叠系芦草沟组烃源岩沉积古环境

doi:10.12108/yxyqc.20200610

Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 109-119.doi: 10.12108/yxyqc.20200610

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Sedimentary paleoenvironment of source rocks of Permian Lucaogou Formation in Jimsar Sag

JIANG Zhongfa¹, DING Xiujian², WANG Zhongquan¹, ZHAO Xinmei¹

1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
2. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China

Received:2020-01-14 Revised:2020-04-03 Online:2020-12-01 Published:2020-10-30

Abstract

Abstract: In order to find out the sedimentary paleoenvironment evolution process of the source rocks of Middle Permian Lucaogou Formation in Jimsar Sag,Junggar Basin,the major element and trace element tests were carried out on 27 hydrocarbon source rock samples,and combined with biomarkers and δ¹⁸O data of carbonate rocks, the paleo-oxygen facies,paleo-salinity,paleo-climate and paleo-water depth evolution of the first and second members of Lucaogou Formation were studied. The results show that nC₁₇ is the main peak carbon of n-alkanes in the first member of Lucaogou Formation in Jimsar Sag,and gammacerane,phytane,β-carotene,vanadium, uranium,ferrous oxide,strontian,magnesium and calcium are enriched,the δ¹⁸O of autogenic carbonate in it is higher,and the paleoenvironment is saline and anaerobic-anoxic environment under arid climate,with some strata brackish,and w(MnO)/w(TiO₂)indicates that its paleo-water depth is deeper. nC₂₁ and nC₂₃ are the main peak carbon of n-alkanes in the second member of Lucaogou Formation in Jimsar Sag,and pristine,ferric oxide,aluminum,titanium and C₂₄ tetracyclic terpene are enriched in it,and the paleoenvironment is generally brackish-saline and anoxic environment under humid climate,occasionally saline environment under arid climate,and its paleowater depth is shallower. The research results show that the first member of Lucaogou Formation can be regarded as the next exploration focus in the study area.

Key words: source rock, geochemistry, paleoenvironment, Middle Permain, Lucaogou Formation, Jimsar Sag

CLC Number:

TE121.3

JIANG Zhongfa, DING Xiujian, WANG Zhongquan, ZHAO Xinmei. Sedimentary paleoenvironment of source rocks of Permian Lucaogou Formation in Jimsar Sag[J].Lithologic Reservoirs, 2020, 32(6): 109-119.

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