A novel approach for reconstructing paleo-overpressure through basin simulations constrained by logging data——A case study of He 8 member in Sulige Gas field, Ordos Basin

Author:

zhang tao1,zhang jingong1,liu xiaopeng2,cao qian2,Ma tengfei3

Affiliation:

1. Department of Geology, Northwest University

2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company

3. PipeChina Group

Abstract

Abstract

The application of basin simulation method for reconstructing the pressure evolution process is often limited by the availability of measured data, which can be challenging to obtain. In order to establish a correct relation between logging data and paleo-pressure, this paper proposes a novel approach to constrain the pressure reconstructed by basin simulation method. The Eaton index N corresponding to the paleo-pressure of each period is calculated using inversion method, based on measured paleo-pressure and logging data, in accordance with the Eaton formula. Subsequently, this value is utilized to calculate the paleo-pressure of other wells. The paleo-pressure results are compared with those reconstructed by basin simulation method to validate the reliability of the findings. The findings demonstrate a strong concurrence between the paleo-pressure calculated using the mean value of index N for each period and the reconstructed paleo-pressure obtained through basin simulation methodology, with an average error margin of less than ± 5%. Therefore, utilizing log data to constrain the paleo-pressure reconstructed by basin simulation method is a viable approach due to its ease of accessibility, strong continuity, and broad applicability and potential for application. This is particularly advantageous in regions where acquiring paleo-pressure data poses challenges. The paleo-dynamic conditions exert a significant influence on the distribution of gas and water in tight sandstone gas reservoirs, providing valuable insights for identifying favorable areas.

Publisher

Springer Science and Business Media LLC

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