Full
YANG Jun,born in 1982,is a master and senior engineer. He is engaged in comprehensive evaluation research of petroleum geology. E-mail: yangjun2010.syky@sinopec.com.
Outline
The Pearl River Mouth Basin,a typical Cenozoic continental margin rift basin,derives its major hydrocarbon resources from the lacustrine source rocks of the Wenchang Formation in the Eocene. Divided by the central uplift,faulted and detached depressions have developed respectively in the northern and southern parts of the basin. There are significant differences in hydrocarbon distribution,and the causes of these differences remain unclear. In this study,technical methods including structural evolution analysis,sedimentary system reconstruction,and source-fault-sandbody association analysis were employed. It reveals the basin’s structural evolution law of “faulting first then detaching,faulting in the north and detachment in the south” and the sedimentary evolution characteristics of “terrestrial environment in the early stage and marine environment in the late stage,deltas in the north and fan deposites(fan delta,sublacustrine fan or submarine fans)in the south”. The different tectonic sedimentary evolution processes of the two types of depressions formed source-fault-sandbody associations,resulting in different petroleum accumulation patterns and enrichment laws. Differential source-fault-sandbody associations and petroleum accumulation patterns were established separately. Characterized by high quality lacustrine source rocks,steep faults and sandbodies near sediment provenance,faulted depressions were apt to generate oil-rich accumulation pattern. But for detached depressions featured by high quality lacustrine source rocks,fault block tilting adjusted faults and sandbodies far away from sediment provenance,gas-rich accumulation pattern with locally oil-rich was predominating. The study points out that hydrocarbons in faulted sags are enriched in the steep slope zone,uplifts in the depression-center and inner gentle slope zone,while those in detachment depressions are enriched in the gentle slope zone. This provides constructive suggestions for petroleum exploration.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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