Well-Seismic Integrated Prediction of High-Pressure Brine Layer and Pore Pressure in the Shengjinkou Formation of Huxi Anticline, Junggar Basin

doi:10.7657/XJPG20260407

Abstract

Abstract:

High-pressure brine layers were encountered while drilling in the Shengjinkou formation of the Huxi anticline, Junggar Basin. The coexistence of kicks and lost circulation restricted drilling rate. Therefore, it is necessary to accurately predict the 3D distribution and pore pressure of these high-pressure brine layers. This study adopts well-seismic integration and “point-to-volume” prediction approach based on drilling, mud logging, well logging, and seismic data. The genesis of high-pressure brine layers was analyzed using seismic and structural characteristics at well sites. The pore pressure was predicted based on the correlation between pore pressure equivalent density and seismic trace integral interval attributes. The results show that the high-pressure brine layers in the Shengjinkou formation of the Huxi anticline originate from water-bearing fault-fracture bodies sealed by tight layers, and their distribution correlates with the distance from faults. Low pore pressure zones in the high-pressure brine layers occur at the edges of fault damage zones, where water invasion risk is low. In contrast, high pore pressure zones are located in the fault-fracture areas and the central parts of fault damage zones, where water invasion risk is high. These findings provide a basis for decision-making in risk identification, prevention and control, precise pressure control, and pressure reduction via drainage.

Key words: Junggar Basin, Huxi anticline, Shengjinkou formation, well-seismic integration, high-pressure brine layer, pore pressure

CLC Number:

TE122.1

LI Jianguo, ZOU Lingzhan, XU Xinniu, RUAN Biao, HUANG Hong, YIN Hongcheng, XI Chuanming, XU Xiaolong. Well-Seismic Integrated Prediction of High-Pressure Brine Layer and Pore Pressure in the Shengjinkou Formation of Huxi Anticline, Junggar Basin[J]. Xinjiang Petroleum Geology, 2026, 47(4): 443-450.

Figures/Tables 6

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