Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (5): 1124-1135.doi: 10.11743/ogg20210510

• Petroleum Geology • Previous Articles     Next Articles

Reservoir identification and prediction of He 7 Member in Binchang block, southern Ordos Basin

Ling Liu1(), Linlin Wang1, Jiang Wu1, Xia Chen1, Jiaqi Yang2   

  1. 1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
    2. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2021-03-02 Online:2021-10-28 Published:2021-10-26

Abstract:

The 7th member of Upper Palaeozoic Shihezi Formation (He 7 Member), is a new favorable play for gas exploration in Binchang block, southern Ordos Basin.However, the reservoir prediction and selection of exploration targets therein have become quite hard given multiple factors including thin reservoir, rapid change of lithology, strong heterogeneity, and low signal-to-noise ratio and resolution.The exploration progress, thus, has been severely restricted.The study aims to improve the accuracy of sweet spot prediction and the success rate of natural gas exploration in the study area.A progressive prediction technique from "configuration, attribute to inversion" is proposed regarding reservoir characteristics therein.The results indicate that the internal reflection configuration of intervals with well-developed sand bodies is defined through seismic response characteristic analysis together with seismic forward modeling, the sensitive elastic parameters of sand bodies are clarified by petrophysical analysis; the channel shapes are characterized effectively by neural network clustering of reflection configuration in frequency domain; and the sand body thickness is predicted accurately with Bayesian stochastic inversion.Moreover, the sweet spots in the reservoir are identified by gas-bearing potential prediction.Under the influence of paleogeomorphology, there are a total of 4 SW-NE-striking channel sand bodies of strip-shaped distribution identified in the Upper Palaeozoic He 7 Member in the south of Binchang block, which are the favorable play fairways in exploration.While the channel sand bodies to the east are in isolated and scattered distribution.In practice, the targets selected under the guidance of the technique are proved to be high in quality by drilling.The lateral resolution of seismic prediction is high, serving for reflecting the change features of the channels and channel sand bodies truthfully.The sweet spot prediction in tight and thin sandstone reservoirs of strong heterogeneity can, thereby, be solved effectively, which is of guiding significance to future exploration and development.

Key words: reflection configuration, neural network waveform clustering in frequency domain, Bayesian stochastic inversion, gas-bearing potential prediction, He 7 Member, Binchang block

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