北部湾盆地天然气成藏系统构想

The assumed gas accumulation systems in Beibuwan basin

北部湾盆地发育流沙港组和涠洲组 2套气源岩 ,有断层面、不整合面以及与构造脊配合的砂岩输导层作为天然气的运移通道 ,发育多套储盖组合和多种类型圈闭 ,因此具备天然气规模成藏的条件。依据气源岩的类型和分布 ,对该盆地的天然气成藏系统进行了类型划分 ,并通过对各子系统的分析 ,指出了盆地内天然气聚集的有利区带。

Beibuwan basin could form sizeable natural gas accumulations because of the following good conditions: (1) Weizhou and Liushagang formation are two sets of source rock; (2) Faults, unconformities and sand carriers on ridges may serve as pathways for gas migration; and (3) There are several reservoir_seal assemblages and trap types. Based on the source rock types and their distribution, the gas accumulation systems can be divided into different types. The favorable plays for gas accumulation have then been pointed out by analyzing every sub_system of gas accumulation.