Formation Pressure Estimation Method Based on Dynamic Effective Stress Coefficient

doi:10.7657/XJPG20230216

Abstract

Abstract:

Formation pressure which can reflect porosity，compaction，and fluid occurrence of underground rock formation is very important for discovering effective reservoirs. Regarding the status that the effective stress coefficient is set as 1 for simplification when calculating formation pressure，the dynamic effective stress coefficient considering pore structure parameters is calculated based on a unified rock skeleton model and the Gassmann equation，formation pressure and pressure coefficient are estimated by using the conventional Eaton method，and the accuracy of formation pressure estimation is improved. Taking carbonate and sandstone reservoirs as examples，the estimated formation pressures show anomalies in water layers，dry layers，and gas layers. Compared with the results obtained from the conventional Eaton method，the proposed method provides a more accurate estimate of formation pressure，thus facilitating a more reliable discovery of effective reservoirs.

Key words: effective stress coefficient, pore structure parameter, formation pressure, Eaton method, Gassmann equation, unified rock skeleton model, reservoir

CLC Number:

TE112.23

ZHOU Yunqiu, HE Xilei, LIN Kai, QIN Siping, ZHANG Chenqiang, LIU Zongjie. Formation Pressure Estimation Method Based on Dynamic Effective Stress Coefficient[J]. Xinjiang Petroleum Geology, 2023, 44(2): 245-251.

Figures/Tables 6

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Fig. 5.

Table 1.

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