引用本文:[点击复制]
[点击复制]
【打印本页】 【在线阅读全文】【下载PDF全文】 查看/发表评论下载PDF阅读器关闭

←前一篇|后一篇→

过刊浏览    高级检索

本文已被:浏览 124次   下载 137 本文二维码信息
码上扫一扫!
渤海海域庙西南洼陷走滑构造特征及其对油气成藏的控制作用
赵野,杨海风,黄振,赵弟江,王航
0
(中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452)
摘要:
庙西南洼陷为受走滑断裂强烈改造形成的盆缘洼陷,为了分析走滑断裂对洼陷油气成藏的控制作用,应用方差切片及精细构造解释技术对走滑构造特征及洼陷构造演化过程进行研究。结果表明:研究区走滑断裂带分为东、西2支,东支分段特征明显,西支南北贯通,走滑断裂增弯段、叠覆区控制大型圈闭群的形成。不同走滑断裂活动时期对油气成藏条件的控制作用存在差异。始新世,在洼陷南次洼的走滑、伸展交汇区发育优质烃源岩,走滑断裂强烈改造-高地温-咸化湖盆背景有利于烃源岩的早生早排;始新世末,走滑断裂与负向地貌单元耦合形成有效的输砂通道,控制辫状河三角洲沉积体系的展布;渐新世,右旋走滑拉分作用控制洼陷厚层泥岩区域盖层的形成;上新世,新构造运动形成的走滑调节断裂与烃源岩、构造脊配置,形成远源汇聚型和近源垂向贯通型2种油气成藏模式。
关键词:  走滑断裂  构造演化  烃源岩  成藏模式  庙西南洼陷
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.004
基金项目:国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”(2016ZX05024-002)。
Strike-slip structural characteristics and its controlling effect on hydrocarbon accumulation in Miaoxinan Sag,Bohai Sea
ZHAO Ye,YANG Haifeng,HUANG Zhen,ZHAO Dijiang,WANG Hang
(Bohai Oilfield Research Institute,Tianjin Branch,CNOOC,Tianjin City,300452,China)
Abstract:
Miaoxinan Sag is on the edge of Bohaiwan Basin and it is formed by the strong transformation of strike-slip fault.In order to study the controlling effect of strike-slip fault on hydrocarbon accumulation,the characteristics of strike-slip tectonic belt and the sag tectonic evolution was studied by means of variance slice and fine structure interpretation. The results show that there are two strike-slip fault branches in the study area:the east and the west. The east branch has obvious segmentation characteristics. The west branch runs through north and south. The forming of large trap groups are controlled by the flexural section and overburden area of strike-slip fault. The strike-slip fault activities in different periods had different controlling effects on hydrocarbon accumulation conditions. In the Eocene,the high-quality source rocks were developed at the intersection of strike-slip faults and extension zones in the southern subsag,and the environment of the intense transformation of strike-slip faults,high temperature and saline sedimentary was favorable to the early generation and early expulsion of hydrocarbon in the source rocks due to strong fault activities. In the late Eocene,strike-slip faults were coupled with the negative geomorphic units to form effective sand transport pathways,controlling the distribution of the delta sedimentary system. In the Oligocene,the formation of caprock in thick clay layers was controlled by the right-handed strike-slip pull-out action. In the Pliocene,two types of oil-gas accumulation modes:far-source convergence type and near-source vertical connection type were formed by the configurations of the strike-slip adjustment faults formed by the neotectonic movements,source rocks and structural ridges.
Key words:  strike-slip fault  tectonic evolution  source rock  accumulation mode  Miaoxinan Sag

用微信扫一扫

用微信扫一扫