渤海湾盆地盆缘洼陷新近系天然气成因与油气差异富集机理——以黄河口凹陷东洼为例

doi:10.7623/syxb201905001

石油学报 ›› 2019, Vol. 40 ›› Issue (5): 509-518.DOI: 10.7623/syxb201905001

• 地质勘探 • 下一篇

渤海湾盆地盆缘洼陷新近系天然气成因与油气差异富集机理——以黄河口凹陷东洼为例

杨海风, 王德英, 高雁飞, 王军, 李正宇, 钱赓

中海石油(中国)有限公司天津分公司天津 300459

收稿日期:2018-10-22 修回日期:2019-01-30 出版日期:2019-05-25 发布日期:2019-06-03
通讯作者: 杨海风,男,1984年2月生,2004年获山东科技大学学士学位,2009年获中国石油大学(北京)博士学位,现为中海石油(中国)有限公司天津分公司高级工程师,主要从事油气成藏及油气勘探研究工作。Email:yanghf3@cnooc.com.cn
作者简介:杨海风,男,1984年2月生,2004年获山东科技大学学士学位,2009年获中国石油大学(北京)博士学位,现为中海石油(中国)有限公司天津分公司高级工程师,主要从事油气成藏及油气勘探研究工作。Email:yanghf3@cnooc.com.cn
基金资助:
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"（2016ZX05024-002-006）和中海石油（中国）有限公司综合科研项目"渤海东部走滑断裂带控藏机理研究与有利勘探目标预测"（YXKY-2017-TJ-01）资助。

Neogene natural gas genesis and hydrocarbon differential enrichment mechanism in the basin marginal sag of Bohai Bay Basin: a case study of the eastern subsag of Huanghekou sag

Yang Haifeng, Wang Deying, Gao Yanfei, Wang Jun, Li Zhengyu, Qian Geng

Tianjin Branch, CNOOC China Limited, Tianjin 300459, China

Received:2018-10-22 Revised:2019-01-30 Online:2019-05-25 Published:2019-06-03

摘要/Abstract

摘要：

以往认为盆缘洼陷埋藏浅、面积小、生烃能力有限，因而未能引起足够重视。随着油气勘探的深入，盆缘洼陷现已成为渤海湾盆地油气勘探的重点与热点领域，但对其油气成藏机理及富集规律的研究亟待深入。基于地球化学资料，对黄河口凹陷东洼新近系油气的成藏机理及分布规律进行了系统研究。研究结果表明：黄河口凹陷东洼新近系原油和天然气具有不同的来源和成因，其中原油来自古近系沙河街组三段和沙河街组四段烃源岩，而天然气则为新近系油藏原油降解次生生物气；原油的形成早于天然气的形成，气藏的分布整体浅于油藏的分布，但其具体分布受控于新近系馆陶组中-上部、明化镇组下段中-下部和明化镇组上段底部3套区域盖层的封闭能力，总体呈现"南部富油、北部富气，西部富油、东部富气，下部富油、上部富气"的分布规律。

关键词: 盆缘洼陷, 原油和天然气成因, 富集机理, 新近系, 黄河口凹陷, 渤海湾盆地

Abstract:

It was previously considered that the basin marginal sag had shallow buried depth, small area and limited hydrocarbon generation capacity, thus attracting little attention. Now the basin marginal sag has become the key hotspot of oil and gas exploration in the Bohai Bay Basin, and the hydrocarbon accumulation mechanisms and enrichment laws needs to be further explored. Based on the geochemical data, the Neogene hydrocarbon accumulation mechanism and distribution laws of the eastern subsag in Huanghekou sag were systematically studied. The results show that the Neogene crude oil and natural gas of the eastern subsag in Huanghekou sag have different sources and geneses; the crude oil originated from source rocks in the Paleogene Members 3 and 4 of Shahejie Formation, while the natural gas was the secondary biogas resulting from crude oil degradation in Neogene reservoirs. The formation of crude oil was earlier than that of natural gas, while gas reservoir is shallower than that of oil reservoir. However, the specific distribution of gas and oil reservoirs was controlled by the sealing capacities of three sets of regional caps in the mid-upper Neogene Guantao Formation, the mid-lower Minghuazhen Formation and the upper bottom of Minghuazhen Formation, showing an overall distribution law of "rich oil in the south, rich gas in the north; rich oil in the west, rich gas in the east; rich oil in the lower part, rich gas in the upper part".

Key words: basin marginal sag, crude oil and natural gas genesis, enrichment mechanism, Neogene, Huanghekou sag, Bohai Bay Basin

中图分类号:

TE121.1

杨海风, 王德英, 高雁飞, 王军, 李正宇, 钱赓. 渤海湾盆地盆缘洼陷新近系天然气成因与油气差异富集机理——以黄河口凹陷东洼为例[J]. 石油学报, 2019, 40(5): 509-518.

Yang Haifeng, Wang Deying, Gao Yanfei, Wang Jun, Li Zhengyu, Qian Geng. Neogene natural gas genesis and hydrocarbon differential enrichment mechanism in the basin marginal sag of Bohai Bay Basin: a case study of the eastern subsag of Huanghekou sag[J]. Acta Petrolei Sinica, 2019, 40(5): 509-518.

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渤海湾盆地盆缘洼陷新近系天然气成因与油气差异富集机理——以黄河口凹陷东洼为例

Neogene natural gas genesis and hydrocarbon differential enrichment mechanism in the basin marginal sag of Bohai Bay Basin: a case study of the eastern subsag of Huanghekou sag

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