南黄海盆地中-新生界湖相烃源岩地球化学特征及生烃史

doi:10.11743/ogg20220214

Abstract

Abstract:

No commercial oil or gas discovery has ever been made in the South Yellow Sea Basin （SYSB）， offshore eastern China so far. This is probably due to the lack of study on the development and hydrocarbon generation history of the three sets of Mesozoic-Cenozoic lacustrine source rocks in the basin. Rock pyrolysis， trace elements， X-ray diffraction and chromatography-mass spectrometry analyses on 41 samples collected from the source rocks show that the second member of the Taizhou Formation （K₂t₂）（one of the three sets） is rich in sapropel of Type Ⅱ₁ kerogen， mainly the result of aquatic organic matter （OM） input as indicated by a dominant C₂₇ regular sterane. The member has high content of carbonate minerals， suggesting a transgression influence that caused an anoxic and saline paleoenvironment， favorable for OM preservation. The second member of Funing Formation （E₁f₂） shares the paleoenvironment with K₂t₂ but has dramatically higher content of C₂₈regular sterane and a dual OM input of dominant algae with a small amount of terrestrial material， suggesting typical lacustrine source rocks. The fourth member of Funing Formation （E₁f₄） contains mostly C₂₉ regular sterane and has high terrestrial /aquatic ratio （TAR）， indicating terrestrial OM input and oxic ancient water body with low salinity that is not favorable for OM preservation. The complex OM input mix and paleoenvironment conditions make it difficult to evaluate the thermal maturity of the source rocks. It is recommended to treat with caution the “immature” characteristic expressed by the ratios such as sterane 20S/（20S+20R） or Ts/（Ts+Tm）. The hydrocarbon generation process of potential source beds is established base on analysis of structural background transformation from fault-depression period to depression period. It suggests that volcanic activities facilitated the generation process and that the depressions in the north experienced an early hydrocarbon generation and those in the south went through both early and late hydrocarbon generation but with a major generation period occurring during the deposition of the Sanduo Formation. The study may serve to guide the next step of oil and gas exploration in the basin..

Key words: biomarker compound, thermal maturity, lacustrine source rocks, Taizhou Formation, Funing Formation, Mesozoic-Cenozoic, Subei Basin

CLC Number:

TE121.3

Zhiqiang Li, Bo Yang, Jun Wang, Zijun Han, Qingxun Wu. Geochemical characteristics and hydrocarbon generation history of Mesozoic-Cenozoic lacustrine source rocks in the South Yellow Sea Basin，offshore eastern China[J]. Oil & Gas Geology, 2022, 43(2): 419-431.

Figures/Tables 11

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井号	层位	样品总数/个	显微组分含量/%
井号	层位	样品总数/个	腐泥组	镜质组	壳质组	惰质组	类型指数
CZ-A	阜四段	9	0 ~ 5.00	29.00 ~ 41.00	46.00 ~ 61.00	6.00 ~ 15.00	32.10
CZ-A	阜四段	9	（2.30）	（33.00）	（54.80）	（9.80）	32.10
WX-B	阜四段	6	0 ~ 4.00	28.00 ~ 37.00	56.00 ~ 64.00	6.00 ~ 14.00	37.35
WX-B	阜四段	6	（0.80）	（30.80）	（59.00）	（9.30）	37.35
CZ-B	阜二段	9	2.00 ~ 6.00	29.00 ~ 36.00	52.00 ~ 69.00	2.00 ~ 12.00	28.30
CZ-B	阜二段	9	（3.70）	（33.40）	（56.00）	（6.70）	28.30
ZC-A	泰二段	9	75.00 ~ 85.00	4.00 ~ 12.00	5.00 ~ 14.00	2.00 ~ 7.00	79.98
ZC-A	泰二段	9	（78.40）	（8.00）	（8.70）	（4.90）	79.98

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Geochemical characteristics and hydrocarbon generation history of Mesozoic-Cenozoic lacustrine source rocks in the South Yellow Sea Basin，offshore eastern China

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