Abstract:

During Devonian and Carboniferous Periods in South China, taphrogeny originated many taphrogenic troughs, thus forming some slope-trough deep-water depositional environments between shallow cabonite platforms in the passive continental margin and the interior continent. The troughs between platforms may be classified as the succesive deep-water trough and the trough developed during Devonian. The slopes of platform margin are classified as by-pass and depositional margin types.The facies characteristics of above-mentioned depositional environments are described in this paper.The tectonic activity of the slope trough environments are deseribed on the basis of regional tectonic background and the directions，groups，volcanic activity，and differential lift or face of faulting.The slope-trough deep-water depositional environments and facies are favourable to the formation，reservoir，migration，trap，accumulation and preservation of oil and gas.

Key words: Depositional environment, Sedimentary characteristics, Deep-water, Tectonic activity, Oil and gas bearing property, Devonian, Carboniferous Period, China