北部湾盆地涠西南凹陷涠洲组二段油气成藏特征分析

邹明生; 曾小明; 吴碧波; 王彬; 黄冬梅; 高凌

doi:10.11781/sysydz201803330

北部湾盆地涠西南凹陷涠洲组二段油气成藏特征分析

doi: 10.11781/sysydz201803330

中海石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目: “十三五”国家重大科技专项（2016ZX05024-006）资助。

详细信息

作者简介:
邹明生(1973-),男,高级工程师,从事石油地质和成藏研究。E-mail:zoumingsh@cnooc.com.cn。

中图分类号: TE122.33
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出版历程
- 收稿日期: 2017-12-20
- 修回日期: 2018-04-28
- 刊出日期: 2018-05-28

Hydrocarbon accumulation characteristics of the 2nd member of Weizhou Formation in the Weixinan Sag, Beibu Gulf Basin

Zhanjiang Branch, CNOOC Ltd, Zhanjiang, Guangdong 524057, China

摘要

摘要: 南海北部湾盆地涠西南凹陷是一个富生烃凹陷，但目前涠洲组二段发现的油气资源规模有限，其成藏特征和规律不清，制约了下一步的勘探方向。通过分析化验、钻井资料和地震资料，对涠洲组二段油气成藏主控因素和成藏规律进行研究，分析表明涠洲组原油主要来自于流沙港组二段中上部厚层优质油页岩，涠洲组二段上层序湖相泥岩是区域上良好盖层。油气主要分布在2号断裂带的沟源断裂附近，沟源断裂是其成藏关键因素；反向断层遮挡的屋脊构造，同时断层断面处断层泥比率（SGR）大于0.64、泥岩涂抹系数（SSF）小于1.70的断块圈闭成藏概率高，是下一步比较有利的勘探目标和方向。
- 断层侧封 /
- 沟源断裂 /
- 成藏规律 /
- 涠洲组二段 /
- 涠西南凹陷 /
- 北部湾盆地
Abstract: The Weixinan Sag in the Beibu Gulf Basin of the South China Sea is a hydrocarbon-rich sag. However, currently limited oil and gas were found in the 2nd member of Weizhou Formation, and the hydrocarbon accumulation characteristics and laws were unclear, which restricted next exploration direction. The main controlling factors and accumulation rules of oil and gas in the 2nd member of Weizhou Formation were studied based on laboratory tests and drilling and seismic data. The crude oil of Weizhou Formation was mainly originated from the thick oil shale in the central and upper parts of the 2nd member of Liushagang Formation. The lacustrine mudstones in the upper part of the 2nd member of Weizhou Formation provided regional cap rocks. Oil and gas were mainly distributed close to the source rock connected faults of the no.2 fault zone, which were the keys for hydrocarbon accumulation. Fault block traps with roof ridge structures generated by reverse faults and SGR>0.64 and SSF<1.70 at fault sections were favorable for hydrocarbon accumulation, providing an exploration target and direction for the next step.
- lateral sealing of fault /
- source rock connected fault /
- hydrocarbon accumulation rules /
- 2nd member of Weizhou Formation /
- Beibu Gulf Basin /

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