Classification and prediction of deep carbonate reservoirs in the fourth member of the Sinian Dengying Formation in db1 block, Penglai Gas Field

doi:10.3969/j.issn.1672-7703.2025.02.007

Abstract

Abstract: The carbonate reservoirs in the fourth member of Dengying Formation (Deng 4 member) in Penglai Gas Field, Sichuan Basin,
are one of the key targets for increasing reserves and production in onshore petroleum exploration during the 14^th Five–Year Plan period. Due to the ancient age, great burial depth, and high heterogeneity, the reservoir spatial distribution prediction remains challenging. Based on geological, drilling, logging and seismic characteristics, a well–seismic integrated classification and prediction technology has been established for deep carbonate reservoirs in db1 block, Penglai Gas Field, which enables analyzing formation characteristics and distribution pattern of deep carbonate reservoirs, conducting inversion and prediction of heterogeneous reservoir distribution, and finely characterizing the heterogeneity of reservoir spatial distribution. The study results indicate that: (1) Deng 4 member reservoirs are concentrated in the upper sub-member, with three configuration patterns, i.e., dual upper and lower reservoirs, locally distributed upper reservoir and well-developed lower reservoir, and a single reservoir. (2) The good and medium reservoirs in the study area have a small thickness and sporadic distribution, while the poor reservoir has a great thickness and good continuity in both vertical and lateral directions, which is primarily distributed near wells ps106, db1, ps11, and adjacent areas. (3) The successful classification and prediction of deep carbonate reservoirs not only validate the applicability and reliability of the developed technology, but also provide valuable references for reservoir prediction in Penglai Gas Field and similar gas fields.

Key words: Penglai Gas Field, deep carbonate reservoir, reservoir prediction, well-seismic integrated prediction, heterogeneity of reservoir distribution

CLC Number:

TE112.22

Zhang Fei, Zhang Lang, Zhang Lianjin, Liu Wei, Ou Chenghua, Mao Zhenglin, Xu Rui, Huang Runfeng. Classification and prediction of deep carbonate reservoirs in the fourth member of the Sinian Dengying Formation in db1 block, Penglai Gas Field[J]. China Petroleum Exploration, 2025, 30(2): 84-97.

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