摘要：Solid bitumen in Southwest China often coexists with metal deposits, indicating a genetic link between organic matter and ore formation. However, this linkage remains underexplored. This study investigated the relationship between sulfur origin and organic matter maturity through sulfur isotopes of metal sulfides. Organic petrology revealed that solid bitumen associated with minerals exhibited stronger optical anisotropy (Delta BRo ＞3.32 %) and higher S/C atomic ratios (0.029-0.033) than non-associated bitumen (0.005-0.021). Fluid inclusion analysis showed that ore-stage calcite inclusions have higher homogenization temperatures than those in paleo-oil reservoirs, indicating that ore-forming processes accelerated hydrocarbon thermal evolution. Solid bitumen-mineral associations were classified into Mississippi Valley-type (MVT), stratiform mercury, and disseminated gold deposits. Sulfur isotope compositions identified three sulfur sources: bacterial sulfate reduction (BSR), thermochemical sulfate reduction (TSR), and thermal decomposition of sulfur-containing organic matter (TDS). In the Lanping-Simao Basin, delta S-34(CDT) values below 0 parts per thousand suggest sulfur derived from BSR, with hydrocarbons contributing reduced sulfur. In the Xuefeng Mountains Uplift, delta S-34(CDT) values exceeding 20 parts per thousand indicate TSR-driven sulfur, with metallogeny enhancing hydrocarbon accumulation and mineralization. In the Kangdian Axis, delta S-34(CDT) values under 20 parts per thousand suggest sulfur from TSR and TDS, with mineralization causing oil cracking and reservoir destruction. The findings demonstrate that metallogeny accelerates organic matter maturation, reshapes reservoirs, and drives oil cracking. Simultaneously, organic-inorganic interactions govern metal sulfide formation and precipitation, underscoring their critical role in ore genesis.

关键字：Solid bitumen; Metal sulfide minerals; Sulfur isotopes; Organic-inorganic interactions; Metallogeny; Paleo-oil reservoir reconstruction; Southwest China

ISSN号：0166-5162

卷、期、页：卷303

发表日期：2025-04-17

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：INTERNATIONAL JOURNAL OF COAL GEOLOGY

参与作者：Li, Dahua,Yao, Lipeng

通讯作者：孙闻,卢永丽,杨亚南,方子龙

第一作者：钟宁宁,罗情勇,蔡春芳

论文类型：期刊论文

论文概要：孙闻,钟宁宁,卢永丽,Li, Dahua,罗情勇,Yao, Lipeng,杨亚南,蔡春芳,方子龙，Implications of solid bitumen association with low- to medium-temperature hydrothermal minerals in hydrocarbon reservoirs of Southwest China: Insights from organic petrology and sulfur isotopes，INTERNATIONAL JOURNAL OF COAL GEOLOGY，2025，卷303

论文题目：Implications of solid bitumen association with low- to medium-temperature hydrothermal minerals in hydrocarbon reservoirs of Southwest China: Insights from organic petrology and sulfur isotopes