Wave Velocity in Sandstone and Mudstone under High Temperature and Overpressure in Yinggehai Basin

Zichun Liu, Xiangdong Du, Zhenyu Zhu and Xin Li
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Zichun Liu: Exploration and Development Research Department, CNOOC Research Institute Ltd., Beijing 100028, China
Xiangdong Du: Exploration and Development Research Department, CNOOC Research Institute Ltd., Beijing 100028, China
Zhenyu Zhu: Exploration and Development Research Department, CNOOC Research Institute Ltd., Beijing 100028, China
Xin Li: Exploration and Development Research Department, CNOOC Research Institute Ltd., Beijing 100028, China

Energies, 2022, vol. 15, issue 7, 1-18

Abstract: Wave velocity under different pressure and temperature (PT) conditions plays an important role in the exploration of oil and gas reservoirs. We obtained the mineral composition and porosity of 20 underground sandstone and mudstone samples in Yinggehai Basin via X-ray diffraction and porosity measurements. Using high-frequency ultrasound, the P- and S-wave velocities of four samples under high temperature and overpressure conditions were found to vary significantly, owing to the material composition and porosity. According to the comparison between the experimental conclusion and the well-logging data, the genesis of false bright spot and dark spot gas reservoirs in the study area was analyzed. The variation in P-wave velocity under different temperature and pressure conditions was explained with the PT coefficient. The traditional pressure–velocity and temperature–velocity prediction methods were improved and applied to well-logging data. Herein, the velocity of P- or S-waves of sand and mudstone under high temperature and overpressure via rock physics experiments and the genesis of false bright spot and dark spot gas reservoirs in the Yinggehai Basin was observed. Overall, the results serve as a theoretical basis for seismic exploration in the study area.

Keywords: seismic rock physics; sandstone and mudstone; P-wave and S-wave velocity; pressure; temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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