Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 22-33.doi: 10.12108/yxyqc.20210503

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Palynofacies and sedimentary paleoenvironment of Lower Cretaceous source rocks in Hongliuxia area,Jiuxi Basin

MA Bo1,2,3, JI Liming1,2,3, ZHANG Mingzhen1,2, JIN Peihong1,2, YUAN Bochao4, LONG Liwen5   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. State Key Laboratory of Paleobiology and Stratigraphy(Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences), Nanjing 210008, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China;
    5. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China
  • Received:2021-02-03 Revised:2021-04-03 Online:2021-10-01 Published:2021-09-30

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Abstract: It is lacking on understanding of the hydrocarbon generation potential of the Lower Cretaceous source rocks in Jiuxi Basin, and it is also controversial on understanding of their sedimentary paleoenvironment. Based on the systematic analysis of palynofacies and element geochemistry of Xiagou Formation in Hongliuxia area, the source of organic matter, hydrocarbon generation potential and sedimentary paleoenvironment characteristics of source rocks were studied. The results show that three types of palynofacies, A(phytoclasts-amorphous assemblages), B(amorphous assemblages) and C(phytoclasts assemblages), are developed in Xiagou Formation in Hongliuxia area, and the palynofacies C is dominant. Phytoclasts from terrestrial higher plants dominate the palynological organic matter and the organic matter is mainly type Ⅲ, which shows poor oil-generating potential. The amorphous organic matter contents in some intervals of the lower and upper members are relatively high and the organic matter is type Ⅱ2, with some oil-generating potential. The element geochemical parameters indicate a semihumid-humid climate with a tendency of gradually humid in the late stage, and a mainly brackish-saline and oxic water environment with low productivity during the deposition of Xiagou Formation, and only some intervals in the lower and upper members were deposited in a suboxic-anoxic deep-water environment. The Xiagou Formation in Hongliuxia area is mainly composed of proximal alluvial fan-delta and shore shallow lake subfacies. In the early and late sedimentary period, the water body is stable, and some good source rocks were developed, otherwise, in the middle sedimentary period, proximal oxidation delta shore shallow lake subfacies and poor source rocks were developed.

Key words: element geochemistry, paleoenvironment, palynofacies, source rocks, Xiagou Formation, Hongliuxia area, Jiuxi Basin

CLC Number: 

  • TE121.3
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