川西北地区早中志留世生物礁发育特征初探

川西北地区早中志留世生物礁,是生活在以陆源沉积物为主的浅海陆棚环境中生屑滩上的点礁,生屑滩的形成为风暴作用所致,其发育受到埋藏反馈作用的影响。大量的陆源物质注入及带入的过剩养料是抑制生物礁发育的主要因素。

SEDIMENTARY CHARACTERISTICS TECTONIC ACTIVITY AND OIL-GAS PROSPECTS OF THE DEEp-WATER DEPOSlTIONAL ENVIRONMENT DURING DEVONIAN AND CARBONIFEROUS PERIODS IN SOUTH CHINA

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.