Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 602-610.doi: 10.13278/j.cnki.jjuese.201502302

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Seismic Prediction for Sweet Spot Reservoir of Tight Oil

Zhu Chao1, Xia Zhiyuan1, Wang Chuanwu2, Song Guangyong1, Wei Xuebin2, Wang Peng2, Wang Haifeng2, Wang Bo2   

  1. 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;
    2. Qinghai Oil Field Company, CNPC, Dunhuang 736202, Gansu, China
  • Received:2014-06-28 Published:2015-03-26

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Abstract:

As tight oil reservoir has the characters of poor physical property, strong heterogeneity, smaller difference of wave-impedance between and surrounding rock, the conventional reservoir inversion method is difficult to predict. From the perspective of reservoir genesis, the authors take the Hongliuquan area of Qaidam basin as an example, aims at thin layers of tight marlite reservoir, explores a set of effective technology series to predict sweet spot distribution. Through rock physics analysis, we establish a lithology identification chart, on this basis, combine forward simulation of drilling wells, clear that the sweet spot reservoir has the respose characters of medium amplitude and frequency values in objective intervals, and use frequency division imaging, 90°phase rotation, spectral attribute-optimization technology, predict the sweet spot distribution of tight oil effectively, confirm that the Hong 34 well block is the main of the tight oil producting zone, and the northwest Hong 22, the southern Hong38 well block can be used as the favorable targets for further exploration. The prediction result has a high agreement with the real drillings, confirms the feasibility of this method.

Key words: rock physics, forward simulation, spectral attribute, tight marl, sweet-spot prediction, Qaidam basin

CLC Number: 

  • P631.81

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