Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 139-147.doi: 10.12108/yxyqc.20220114

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Seismic sedimentary characterization of thin sand layers of shallow water deltas: A case study of Qingshuihe Formation in Fangcaohu area, Junggar Basin

CHANG Shaoying1,2, LIU Lingli1, CUI Yuyao2, WANG Feng3, SONG Mingxing3, MU Xiaoliang2   

  1. 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;
    2. China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2021-06-30 Revised:2021-08-18 Online:2022-01-01 Published:2022-01-21

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Abstract: Shallow water delta thin sand layer is an important new field of lithologic reservoir exploration. It is difficult to identify the sedimentary structure of shallow water delta due to thin sand bodies and rapid lateral variation,which restricts the exploration and development of this kind of sedimentary body. Taking Fangcaohu area of Mosuowan uplift in Junggar Basin as an example,the seismic sedimentological analysis technology was deepened through comprehensive geological and geophysical analysis. The seismic sedimentological characteristics of shallow water deltas were studied,and the sedimentary models of shallow water meandering river deltas were summarized by using three technologies, such as high and low frequency cycle waveform separation in parasequence set, remov-ing interference effect of stratigraphic slice and attribute fusion of geological body and sedimentary background. The results show that:(1) Multiple fourth-order sequences are developed in the first member of Cretaceous Qingshuihe Formation in Fangcaohu area,reflecting the periodic change of lake level.(2) Incised channels and fanshaped sand bodies are widely developed.(3) There are three sets of reservoir-cap assemblages developed in the shallow meandering river delta sedimentary system of the first member of Cretaceous Qingshuihe Formation, which are exploration strata with great potential in this area. The application of seismic sedimentary characteristics identification technology of thin sand layers in shallow water deltas has promoted the drilling of risk wells and achieved good exploration results. This technology provides technical support for increasing reserves and production in this area, and it can provide reference for the identification of thin sand layers in other similar areas.

Key words: seismic sedimentology, undercut channel, waveform separation, de-interference effect, attribute fusion, Qingshuihe Formation, Mosuowan uplift, Junggar Basin

CLC Number: 

  • P631
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