中国南方海相地层油气成藏要素的层次性分析

Hierarchical Analysis on Hydrocarbon Accumulation Elements of Marine Strata in South China

中国南方海相地层油气成藏要素和成藏过程复杂:发育4套区域性烃源岩和5套地区性烃源岩,成藏流体具有5种不同的来源,储集层、封盖层、圈闭等其他成藏要素类型多样、变化复杂,并经历了加里东期等4大成藏期和海西期等5大油气藏改造期。应将中国南方海相油气成藏问题作为一个整体考虑,根据其中成藏要素的性质及其对成藏的意义,划分为不同的层次级别:一级成藏要素为成藏流体源,具有区域性意义;二级、三级分别为成藏期次和成藏方式,级次越低局限性越强。油气成藏要素层次性分析方法的提出,有利于从整体角度研究中国南方海相油气成藏规律、也有利于对比南方不同地区油气成藏规律。

The element and process of hydrocarbon accumulation are complicated in the marine strata in south China, where 4 sets of regional source rocks and 5 sets of local source rocks are developed, the hydrocarbon accumulation fluids are from 5 different sources, reservoirs, cap rocks and traps are of varieties and complex, they experienced Caledonian period, including 4 hydrocarbon accumulation periods and Hercynian period including 5 hydrocarbon accumulation-reconstruction periods. Based on the hydrocarbon accumulation elements and its significance to the accumulation, the marine hydrocarbon accumulation in the south China can be divided into different hierarchies: the first element is the fluid source of the regional hydrocarbon accumulation, the second and third elements are the periods and manners of the accumulation, where the lower the hierarchy is , the higher the restriction will be. It is proposed by hierarchy analysis that it is beneficial for studying the marine hydrocarbon accumulation rules and also comparing them as a whole.