Author(s)

Liang Hong ¹, Wu Furong ¹, Zhao Xiaohui ¹, He Chuanhang ¹, He Chengxiaotao ¹

Affiliation(s)

¹ BGP, CNPC, Zhouzhou, Hebei, 072050, China

Corresponding Author

He Chuanhang

ABSTRACT

Taking the asphaltene carbonate reservoir of Longwangmiao formation in the longnusi area of the Sichuan Basin as an example, the petrophysical analysis and seismic prediction methods of the asphaltene reservoir are discussed. Asphaltene in the actual formation mainly exists in the reservoir in liquid form, with complex spatial distribution, which makes it easy to block the pore throat channel and reduce the practical space of the reservoir, resulting in poor reservoir connectivity. The asphaltene petrophysical characteristics are quite different from the surrounding rock. Still, the content is only about 1 ~ 4%, which leads to the weak influence of asphaltene on the petrophysical characteristics of the reservoir and the difficulty of asphaltene reservoir prediction. In this paper, a set of integrated research ideas and methods based on core and logging data interpretation, petrophysical analysis, and prestack inversion prediction are formed: the logging response characteristics of the asphaltene reservoir are analysed based on the comparison of the core and logging curve, the logging evaluation process of asphaltene reservoir is formed, and the relative asphalt content is calculated by using conventional porosity curve and nuclear magnetic porosity; The petrophysical analysis of reservoir section is carried out, and it is considered that VP / vs. can effectively partition asphaltene reservoir; Finally, pre-stack inversion technology is used to predict asphaltene reservoir. The actual drilling proves that the prediction results of the asphaltene reservoir by this method are in good agreement, indicating that there is a set of asphaltene carbonate reservoirs with asphalt content of more than 2% and an average thickness of 20m in the study area, which realises the quantitative evaluation of asphaltene carbonate gas reservoir and has reference value for the prediction of such asphaltene reservoir.

KEYWORDS

Asphaltene Reservoir; Rock physics experiment; Effective porosity calculation; Asphalt content calculation; Prestack inversion; Cambrian Longwangmiao formation

CITE THIS PAPER

Liang Hong, Wu Furong, Zhao Xiaohui, He Chuanhang, He Chengxiaotao, Petrophysical Analysis and Distribution Prediction of Asphaltene Reservoir of Longwangmiao Formation in Longnusi Area, Central Sichuan. Geoscience and Remote Sensing (2024) Vol. 7: 64-74. DOI: http://dx.doi.org/10.23977/geors.2024.070108.

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