摘要：Ultra-deep Sinian carbonate rocks are rich in natural gas, and the Deng-4 Member of the Central Sichuan Basin has been shown to have an extremely high degree of thermal evolution. They are characterized by dry gas produced due to the thermal cracking of palaeo-oil reservoirs (PORs). The distribution of PORs as materials for the formation of cracked gas reservoirs remains unclear. The complex multistage evolution process and limited drilling data make it challenging to precisely and systematically recover a range of PORs. Based on basin and petroleum system modelling (BPSM), the bottom-up migration and accumulation method was used to investigate the distribution of PORs. Research shows that the PORs in the Sinian Deng-4 Member were mainly formed in the Early-Middle Triassic under the mixed contribution of Cambrian and Sinian source rocks, and the coupling of palaeostructural and trap settings controlled its accumulation. Generally, the distribution of PORs can be divided into two categories: one is located at the core of the uplift zone and is controlled by structural-stratigraphic composite traps, whereas the other is controlled by a series of lithologic traps formed in the slope area. Sensitivity analysis showed that the distribution patterns of the PORs were mostly related to the facies conditions (physical characteristics) of the reservoirs. The widely distributed PORs provide necessary and sufficient material conditions for the formation of cracked Sinian gas reservoirs in the Central Sichuan Basin, and the North Slope area has great potential for natural gas exploration in the future. The geochemical validated BPSM method is of great significance for the analysis of palaeo-oil reservoirs, particularly for ultra-deep (limited coring) and over-mature (limited soluble organic matter) formations.image

关键字：basin modelling; Deng-4 Member; over-mature strata; palaeo-oil reservoirs; petroleum system; Sichuan Basin

ISSN号：0072-1050

卷、期、页：卷59期4：1219-1238

发表日期：2024-04-01

期刊分区（SCI为中科院分区）：四区

收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）

发表期刊名称：GEOLOGICAL JOURNAL

参与作者：文龙,杨岱林

通讯作者：李亿殊,田兴旺,朱联强

第一作者：柳广弟,宋泽章,孙明亮

论文类型：期刊论文

论文概要：李亿殊,柳广弟,宋泽章,文龙,孙明亮,田兴旺,杨岱林,朱联强，Reconstruction of palaeo-oil reservoirs in the ultra-deep and over-mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling，GEOLOGICAL JOURNAL，2024，卷59期4：1219-1238

论文题目：Reconstruction of palaeo-oil reservoirs in the ultra-deep and over-mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling