吉木萨尔凹陷吉页1井区二叠系芦草沟组沉积环境及有机质富集机理

doi:10.12108/yxyqc.20220506

Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 73-85.doi: 10.12108/yxyqc.20220506

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Sedimentary environment and organic matter enrichment mechanism of Permian Lucaogou Formation in Jiye-1 well area,Jimsar Sag

LUO Jinchang, TIAN Jijun, MA Jinghui, YAN Jiaqi, LIANG Yafei, HU Zhuohao

College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China

Received:2022-03-11 Revised:2022-04-11 Online:2022-09-01 Published:2022-09-06

Abstract

Abstract: The paleoenvironment,paleoproductivity and organic matter enrichment mechanism of hydrocarbon source rocks of Permian Luchaogou Formation in Jimsar Sag were investigated by X-ray diffraction,organic carbon testing, major and trace element testing and saturated hydrocarbon chromatography. The results show that:(1)The source rocks of Permian Lucaogou Formation in Jiye-1 well area of Jimsar Sag are dominated by feldspars-quartz mixed fine-grained sedimentary rocks and clayey mixed fine-grained sedimentary rocks. The sources of organic matter include terrestrial organic matters and marine algae,with a greater contribution from marine algae. The average TOC values are 5.93% and 5.69% in the first and second(Lu-1 and Lu-2)members of Lucaogou Formation respectively.(2)The content of Ba element in rock samples in the study area is high,with an average mass fraction of 12 052.89×10^-6. The n-alkane curve of the source rock shows unimodal distribution. The main peak carbon of Lu-1 member is C₁₇ and C₁₉,with weak odd carbon predominance,and the main peak carbon of Lu-2 member is C 19,with odd carbon predominance,and the overall isoprene-like hydrocarbons are rich in Pr and Ph.(3)The Luchaogou Formation in the study area has an overall arid-saline reductive depositional background. During the depositional period of Lu-1 member,the overall depositional environment was arid,with shallow palaeohydric depth and high palaeo-salinity,and the water was stratified to form a stable reduction environment with stronger palaeo-productivity than Lu-2 member. During the depositional period of Lu-2 member,t he depositional environment was semi-wet to semi-arid,with deeper palaeohydric depth,lower palaeo-salinity and good reduction environment.(4)The organic matter enrichment of source rocks in the study area is controlled by terrigenous clastic supply,paleoproductivity and paleoclimate. Throughout the sedimentary period of Lucaogou Formation,it was in a stable reducing environment,which is a typical "productivity enrichment mode". The influence of palaeoclimate, palaeosalinity and terrigenous debris resulted in the low TOC content of Lu-2 member.

Key words: paleoenvironment, paleoproductivity, organic matter enrichment, Lucaogou Formation, Permian, Jiye-1 well area, Jimsar Sag

CLC Number:

TE122.2

LUO Jinchang, TIAN Jijun, MA Jinghui, YAN Jiaqi, LIANG Yafei, HU Zhuohao. Sedimentary environment and organic matter enrichment mechanism of Permian Lucaogou Formation in Jiye-1 well area,Jimsar Sag[J].Lithologic Reservoirs, 2022, 34(5): 73-85.

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Sedimentary environment and organic matter enrichment mechanism of Permian Lucaogou Formation in Jiye-1 well area,Jimsar Sag

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