摘要
晴隆锑矿含有丰富的有机包裹体,然而这些有机质的来源一直未能查清。在晴隆锑矿外围找矿时发现一个古油藏。晴隆锑矿古油藏的沥青主要分布在上二叠统峨眉山玄武岩、上二叠统大厂层凝灰岩和中二叠统茅口组灰岩中,主要储集空间以裂缝、孔隙和溶洞为主。本文旨在通过对沥青地球化学特征进行分析测试来探讨沥青来源及成因,试图为晴隆锑矿找矿勘查提供新依据。测试结果表明:晴隆锑矿古油藏沥青C元素质量分数平均86.67%,H平均3.32%,N平均0.27%,O平均3.52%;H、C原子比平均0.46;O、C原子比平均0.03;沥青Ro值1.99%~2.30%,具有很高的成熟度;沥青碳同位素实测值-27.7‰^-28.8‰,平均-28.1‰。在古油藏沥青地球化学特征研究的基础上,综合分析认为晴隆锑矿古油藏沥青主要源自泥盆系烃源岩。晴隆锑矿古油藏沥青是早期古油藏因古地温升高发生热裂解形成的焦沥青。
There is rich organic inclusion in Qinglong antimony deposit. However,the source of this organic matter hasn＇t been found out. A paleo-oil reservoir was found in the periphery of Qinglong antimony mine. The bitumen in the paleo-oil reservoir mainly distributes in the Emeishan basalt and the Dachang tuff of Upper Permian and the Maokou limestone of Middle Permian. Bitumen mainly occurs in crevices,pores and caves. In order to find the source and origin of the bitumen,the geochemical characteristics of the bitumen are tested and analyzed to provide a new basis for the exploration of Qinglong antimony deposit. The test results show that the average mass fraction of C,H,N and O in the bitumen is 86. 67%,3. 32%,0. 27% and 3. 52% separately,and the average atom ratio of H to C and O to C is 0. 46 and 0. 03 separately. The maturity of the bitumen is high,and its Ro is 1. 99% ～ 2. 30%. The measured value of carbon isotope of the bitumen is- 27. 7‰ ～- 28. 8‰,and the average is- 28. 1‰. Based on the study of the geochemical characteristics of the bitumen in the paleo-oil reservoir,it is held that the bitumen in the paleo-oil reservoir is mainly from Devonian hydrocarbon source rock. The bitumen is the pyrobitumen formed by thermal cracking due to the rise of the Paleo geothermal temperature in paleo-oil reservoir.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2016年第2期44-49,56,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金(编号:41362007)
国土资源部我国典型金属矿科学基地研究(编号:20091107)
全国危机矿山西南地区典型层控矿床成矿规律总结科研项目(编号:20089943)
关键词
古油藏沥青
地球化学特征
沥青来源
沥青成因
晴隆锑矿
bitumen in paleo-oil reservoir
geochemical characteristic
source of bitumen
genesis of bitumen
Qinglong antimony deposit
作者简介
王鹏鹏（1989-），男，硕士研究生，主要从事沉积盆地金属及油气勘查研究。E-mail：604100866@qq．com
