BEIJING, Oct 13 (Reuters) - China Jan-Sept crude oil imports down 6.8% at 387 million tonnes, according to General Administration of Customs on Wednesday * China Jan-Sept soybean imports down 0.7% at 73.97 million tonnes - customs * China Jan-Sept iron ore imports down 3% at 842 million tonnes - customs * China Jan-Sept copper imports down 19.5% at 4.1 million tonnes - customs * China Jan-Sept natural gas imports up 22.2% at 89.85 million tonnes - customs (Reporting by China Commodities and Energy team)