LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 108-115.doi: 10.3969/j.issn.1673-8926.2015.05.018

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3D geologic modeling technology based on digital outcrop: A case study of reef-shoal body of Yijianfang Formation in Yijianfang outcrop, Tarim Basin

Zheng Jianfeng1，2， Shen Anjiang1，2， Qiao Zhanfeng1，2   

  1.  1. Key Laboratory of Carbonate Reservoir ， CNPC ， Hangzhou 310023 ， China ；2. PetroChina Hangzhou Research Institute of Geology ， Hangzhou 310023 ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

The 2D models which is based on the traditional outcrop modeling method are conceptual models, andthey cannot meet the production requirements at present. 3D geologic modeling technology based on digital outcrop is more advanced overseas, but it still stays in the start stage in the domestic. Taking the reef-shoal body of Yijianfang Formation in Yijianfang outcrop as an example, this paper measured nine sections, divided into ten stratigraphic units and recognized ten types of microfacies. According to the conventional petrophysical properties, it was found that the development of reservoir is controlled by microfacies, and reef base is advantageous to the development of pores, followed by platformmargin shoal, reef flat and reef frank. Reef core and moderate-high energy shoal are relatively poor, but there are almost no pores in moderate-low energy shoal and interbank sea. Used Lidar to scan the outcrop, and then constructed the digital outcrop by interpreting the stratigraphic boundary and loading the geological information in the laser point cloud. Based on facies-restrained stochastic modeling method, used GoCAD to build up 3D facies model, 3D porosity model and 3D permeability model. These models clearly reflect the distribution of microfacies, porosity and permeability in 3D space, they also can be compared with the underground and can effectively guide the exploration and development of reef-shoal reservoirs in Lianglitage Formation of Tazhong area.

Key words:  fan delta, underwater distributary channel, favorable reservoirs, Ma 2 well block, lower Urho Formation, Mahu Depression

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