Sedimentary model of the high quality reservoir for the pre-salt lacustrine carbonate in the Santos Basin

doi:10.3969/j.issn.1672-7703.2025.02.006

Abstract

Abstract: The exploration practice indicates that the reservoir sedimentary characteristics are the key factors affecting the oil and gas production of the pre-salt lacustrine carbonate rocks in the Santos Basin. The high-quality reservoirs are mainly microbial reefs and shoal carbonate rocks deposited on the palaeo-uplifts. Based on the structural analysis of seismic data and gravity data, this paper redefined the presalt structural units of the Santos basin and the distribution of palaeo-uplifts. The basin was divided into five first-order tectonic units, in which the outer uplift zone is developed from the abandoned Ocean Ridge after the transition during breakup of the Atlantic, which is very conducive to the development of microbial reefs. Based on drilling and seismic data, this paper carried out the series research about the core facieslogging facies-seismic facies-sedimentary facies. Then combined with the structural characteristics during rift period and the paleogeography during sag period, the pre-salt sedimentary facies distribution of sag period was determined, and four sedimentary models of the highquality carbonate reservoir was established, including the large gentle slope sedimentary model, the isolated platform sedimentary model, the inner highland sedimentary model and the steep slope sedimentary model. The large gentle slope and the steep slope sedimentary model are controlled by monoclinal fault blocks, and the inner highland sedimentary model is controlled by fault-uplift structures, which are mainly distributed in the outer uplift zone. The isolated platform sedimentary model is controlled by horsts, which are mainly distributed in the central depression belt and the outer depression belt.

Key words: Santos Basin, Lacustrine carbonate, Large gentle slope sedimentary model, Isolated platform sedimentary model, Inner highland sedimentary model, Steep slope sedimentary model

CLC Number:

TE112.2

Liu Jingjing, Li Jun, Wu Cahngwu, Guo Rongtao, Guo Yongqiang, Gao Weiyuan, Shi Danni, Wu Gaokui. Sedimentary model of the high quality reservoir for the pre-salt lacustrine carbonate in the Santos Basin[J]. China Petroleum Exploration, 2025, 30(2): 69-78.

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