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Geoscience ›› 2021, Vol. 35 ›› Issue (03): 850-860.DOI: 10.19657/j.geoscience.1000-8527.2021.057

• Petroleum Geology • Previous Articles     Next Articles

Seismic Prediction for Mesozoic-Cenozoic Source Rock Distribution in the Linhe Depression, Hetao Basin

WANG Quan1(), LIU Zhen2,3(), LI Chenxi2,3, WANG Shaochun1, SHI Yulei4, WANG Zhicheng1, WANG Biao1, WU Han4   

  1. 1. Huabei Oilfield Company, PetroChina, Renqiu,Hebei 062550, China
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
    3. College of Geosciences, China University of Petroleum, Beijing 102249, China
    4. Exploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu,Hebei 062550, China
  • Received:2020-02-20 Revised:2021-04-02 Online:2021-06-23 Published:2021-06-24
  • Contact: LIU Zhen

Abstract:

Degree of exploration in the Linhe Depression (Hetao Basin) is low, thus it is crucial to determine the source rock distribution for oil and gas exploration. However, due to the scarcity of drilling and sample analysis, early prediction of the source rock distribution is seriously limited. Therefore, distributions of main source kitchens are predicted with various organic geochemical, seismic sedimentological, and geophysical techniques. The results show two types of seismic facies, i.e. low-frequency and strong-amplitude facies, and weak-amplitude and blank facies in the Guyang Formation (2nd member) and Linhe Formation (2nd member). Low-frequency and strong-amplitude facies is widespread, corresponding to dark organic-rich mudstone.Blank facies is also widely developed, corresponding to gray-black/gray organic-poor mudstone. The most favorable semi-deep lacustrine source rocks in the Guyang Formation (2nd member) are characterized by being “multi-lacustrine”, while the semi-deep lacustrine source rock in the Linhe Formation (2nd member) is mainly distributed in the northeast. In general, the source rocks thicken toward the north, reaching 700 m thick for the Linhe Formation (2nd member). Comprehensive evaluation and analysis show that two source kitchens were developed in the Guyang Formation (2nd member), and the southwestern source kitchen is the most favorable because of their large area and thickness, and high organic matter abundance. Only one source kitchen was found in the Linhe Formation (2nd member), which is large and thick in the northeast, and has high organic matter abundance, making it the most favorable. Previous work indicated that this method can effectively predict the source kitchen distributions under few/sparse-well conditions, and provided important reference for the local hydrocarbon accumulation. The work offers a novel way for early source-rock distribution prediction in districts with low degree of exploration.

Key words: Hetao Basin, Linhe Depression, source kitchen, seismic facies, organic facies, seismic prediction

CLC Number: