北部湾盆地徐闻区块石油地质条件与油气远景

徐闻区块位于我国广东省雷州半岛南部及其东、西两侧海域、琼州海峡大部及海南省海口市以北地区 ,面积近 740 3km2 ,其中海区面积约 3870km2 。该地区属亚热带气候 ,常年高温多雨 ,海区多风浪 ,潮差也较大 ,自然地理环境十分复杂。此外 ,野外作业条件极差。针对徐闻区块勘探程度很低 (尤其是海区部分 ) ,基础资料少且零散的特点 ,文章立足于从北部湾盆地已发现含油气凹陷的研究出发 ,总结该盆地的成藏规律 ,作为该区油气评价的理论基础 ;通过对现有资料的整理和研究 ,划分区内二级构造单元、边界断裂并推测沉积相带 ;在油气地质条件类比研究基础上 ,对潜在远景区做初步评价。

Petroleum Geological Conditions and Petroleum Perspective in Xuwen Area of Beibuwan Basin

The Xuwen Area covers 7403km 2 ( in which sea area is about 3870km 2 ) and includes the southern Leizhou peninsula of Guangdong Province and its west and east sea area, most of Qiongzhou channel and northward part of Haikou city, Hainan Province. Natural geographic conditions are hard with semitropical perennial high temperature and rainy climate, and terribly poor field working conditions with storm waves and big tide fall in sea area. Based on little basic geologic data of discovered oil/gas bearing sag of Beibuwan Basin, this article summarizes play forming rules of the basin as theory directions, puts forward the research results of structure unit classification, boundary faults and inferential sedimentary zone; and give primary appraisement on potential perspective districts by means of the analogic oil/gas geologic conditions.