Tight oil sweet spot prediction with zero stripping: an example of Ek22 in Well G108 Block, Cangdong Sag

Song Xiaowen1 Zhou Lihong1 Wen Kaifeng2 Yue Ying1 Mu Zhiquan1 Guo Chunxiang1

(1.Exploration & Development Research Institute, Dagang Oilfield Company, PetroChina, Tianjin, China 300280)
(2.Changqing Oilfield Company, PetroChina, Xi’an, Shaanxi, China 710200)

【Abstract】Different seismic phase characteristics extracted from complex deep interbeds usually show diversity on seismic slices. This problem makes tight oil sweet spot prediction very difficult. Therefore we put forward in this paper a zero stripping prediction approach through three-dimensional seismic-geological model building and three-dimensional forward modeling data analysis. Seismic slices were extracted from zero-value time, so interbed sandstones could be stripped step by step, and tight oil sweet spot prediction could be realized. The proposed approch was applied to Ek22 in Well G108 Block, Cangdong Sag. Tight oil sweet spots in upper sandstone of complex deep interbeds were successfully predicted from seismic data. The prediction coincided with the information of known wells, and good discoveries were found from the newly drilled wells proposed on our prediction.

【Keywords】 zero-value time; stripping method; Cangdong Sag; tight oil sweet spot; seismic slice;

【DOI】

【Funds】 National Natural Science Foundation of China (41202102, 41572135, U1262106)

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    References

    [1]Zhou Lihong, Pu Xiugang, Zhang Wei, et al. Three factors evaluation and its application to the favorable oilgas exploration targets in continental rift: taking the Ek2 of Cangdong sag for example. Journal of Chengdu University of Technology (Science &Technology Edition), 2013, 40 (2): 184–192 (in Chinese).

    [2]Pu Xiugang, Zhou Lihong, Han Wenzhong, et al. Geo-logic features of finegrained facies sedimentation and tight oil exploration: A case from the second member of Paleogene Kongdian formation of Cangdong sag, Boihai Bay basin. Petroleum Exploration and Development, 2016, 43 (1): 24–33 (in Chinese).

    [3]Ling Yun Research Group. Study of seismic resolution limit. OGP, 2004, 39 (4): 435–442 (in Chinese).

    [4]Li Guofa, Yue Ying, Xiong Jinliang, et al. Experimental study on seismic amplitude attribute of thin interbed based on 3D model. OGP, 2011, 46 (1): 115–120 (in Chinese).

    [5]Ling Yun Research Group. Study on application of basic seismic attributes to interpretation of depositional enviroment. OGP, 2003, 38 (6): 642–653 (in Chinese).

    [6]Qian Rongjun. Analysis of some issues in interpretation of seismic slices. OGP, 2007, 42 (2): 482–487 (in Chinese).

    [7]Wang Jiang, Lin Dongcheng, Li Peng, et al. Application of stratal slicing in lithofacies indentification of complex exploration area. Journal of Oil and Gas Technology, 2010, 32 (6): 62–65 (in Chinese).

    [8]Zeng Hongliu, Henry S C, Riola J P. Stratal slicing, Part Ⅱ: Real 3Dseismic data. Geophysics, 1998, 63 (2): 514–521.

    [9]Zeng Hongliu, Hentz T F, Wood L J. Stratal slicing of MiocenePliocene sediments in Vermilion Block 50 Tiger Shoal area, offshore Louisiana. The Leading Edge, 2001, 20 (4): 408–418.

    [10]Schlager W. The future of applied sedimentary geology. Journal of Sedimentary Research, 2000, 70 (1): 2–9.

    [11]Sun Ying, Lu Yi, She Xiaoyu, et al. Stratal (body) slice technology and its application. Natural Gas Geoscience, 2011, 22 (5): 884–888 (in Chinese).

    [12]Zhu Xiaomin, Liu Changli, Zhang Yina, et al. On seismic sedimentology of lacustrine deltaci depositonal systems. Acta Sedmentologica Snica, 2009, 27 (5): 915–922 (in Chinese).

    [13]Zhang Junhua, Zhou Zhenxiao, Tan Mingyou, et al. Several theoretical issues about interpretation of seismic slices. OGP, 2007, 42 (3): 348–361 (in Chinese).

    [14]Song Xiaowen, Ma Shizhong, Qin Qiuhan, et al. The application of seismic sedimentology in Xujiaweizi depression. Science Technology and Engineering, 2011, 11 (10): 2165–2170 (in Chinese).

    [15]Han Xi, Gao Xingyou, Che Tingxin, et al. Using analysis of seismic attributes along horizons to study sedimentary enviroment of fluvial facies. OGP, 2007, 42 (1): 120–124 (in Chinese).

    [16]Lei Ming, Wang Jiangong, Liu Caiyan, et al. Application of slicing technology in Anda area. OGP, 2010, 45 (3): 418–422 (in Chinese).

    [17]Liu Honglin, Yangwei, Wang Jiang, et al. Application limitation of stratal slicing technique—a case study on sand body identification in Bell depression of Hailaer basin. OGP, 2009, 44 (S1): 125–129 (in Chinese).

    [18]Chen Wenhao, Wang Zhizhang, Hou Jiagen, et al. Strata slices in sedimentary facies research. OGP, 2015, 50 (5): 1007–1015 (in Chinese).

    [19]Li Guofa, Wang Yajing, Xiong Jinliang, et al. Phenomena in inter-bed reservoir interpretation on seismic slices: an example of 3D geological model. OGP, 2014, 49 (2): 388–393 (in Chinese).

    [20]Li G, Sacchi M D, Wang Y, et al. Characterization of interbedded thin beds using zero-crossing-time amplitude stratal slices. Geophysics, 2015, 80 (5): 23–35.

This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 51, No. 06, Pages 1195-1201+1052

December 2016

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Article Outline

Abstract

  • 1 Introduction
  • 2 Seismic slice types and issues in geologic interpretation
  • 3 Methodology
  • 4 Application
  • 5 Conclusions
  • References