渤海湾盆地及鄂尔多斯盆地上古生界天然气成藏条件分析

第27卷　第3期2006年5月

石油学报

AC TA PETROL EI SIN ICA

Vol.27　No.3May

2006

基金项目:中国石油化工股份有限公司“中石化环渤海湾地区前第三系油气资源前景”项目(P 03076)。

作者简介:郑和荣,男,1962年4月生,1983年毕业于成都理工大学,教授级高级工程师,博士,现主要从事石油地质综合研究及勘探部署工作。

E 2mail :zhengherong @

文章编号:0253Ο2697(2006)03Ο0001Ο05

渤海湾盆地及鄂尔多斯盆地上古生界

天然气成藏条件分析

郑和荣 胡宗全

(中国石油化工股份有限公司石油勘探开发研究院　北京　100083)

摘要:对渤海湾盆地与鄂尔多斯盆地上古生界烃源岩、储层、盖层、圈闭等成藏要素的地质特征分析结果表明,鄂尔多斯盆地和渤

海湾盆地均具有完整的生、储、盖组合和基本的自生自储成藏条件。对成藏条件时间配置关系的对比发现,鄂尔多斯盆地以1个沉降—抬升幕、持续生烃、早期成藏为特征,渤海湾盆地则以多个沉降—抬升幕、二次生烃、晚期成藏为特征。成藏条件的空间配置关系对比表明,鄂尔多斯盆地上古生界烃源岩、储层、盖层在时间上及纵横向上具有连续性,天然气保存条件良好,可形成大面积分布的岩性气藏,资源潜力大。渤海湾盆地上古生界烃源岩、储层、盖层时间连续性较差,天然气需要较大幅度的垂向运移才能成藏,二次生烃区与构造高部位成藏区之间的横向重叠区分布局限,以形成中、小规模但丰度较高的构造气藏为主。关键词:渤海湾盆地;鄂尔多斯盆地;上古生界;自生自储成藏;二次生烃;天然气成藏条件中图分类号:TE 11 文献标识码:A

G as pool 2forming conditions for Bohai B ay B asin and Ordos

B asin in the Upper Paleozoic

Zheng Herong Hu Zongquan

(Research I nstitute of Ex ploration and Production ,S inopec ,B ei j ing 100083,China )

Abstract :Analysis of some important factors for forming gas pool such as source rock ,reservoir rock ,cap rock and trap in the Up 2per Paleozoic of Ordos Basin and Bohai Bay Basin shows that the two basins are both favorable to form the self 2source and self 2reser 2voir gas pools with a complete combination of source rock ,reservoir and cap rock.The timing matching relation between the pool 2forming factors shows that Ordos Basin is characteristics by single embedding 2uplifting episode ,continuous hydrocarbon generation and early gas accumulation ,while Bohai Bay Basin is characteristics by multiple embedding 2uplifting episode ,secondary hydrocarbon generation and late gas accumulation.The spatial matching relation of pool 2forming factors shows that the Upper Paleozoic in Ordos Basin has timing ,vertical and lateral continuity of resource rock ,reservoir rock and cap rock.So it has good preserving condition for natural gas and can form big lithologic gas pools distributed in great area.Ordos Basin has a great potential of natural gas resources.Natural gas in Bohai Bay Basin needs vertical migration with a great altitude to become reservoir.Bohai Bay Basin with a limited su 2perposing area of secondary hydrocarbon generating zone and structural accumulation zone in high part can only form structural gas pool with moderate 2small size and high gas abundance.

K ey w ords :Bohai Bay Basin ;Ordos Basin ;the Upper Paleozoic ;self 2source and self 2reservoir pool formation ;secondary hydrocar 2

bon generation ;gas pool 2forming condition

华北地区晚古生代为统一的克拉通盆地[1],地层及沉积横向对比性好,上石炭统太原组和下二叠统山西组发育煤系气源岩。华北地区西部的鄂尔多斯盆地和东部的渤海湾盆地在生烃史、成藏过程等方面存在显著差异[2Ο6],从而导致彼此间上古生界资源潜力的不同。目前,鄂尔多斯盆地的上古生界天然气勘探取得

了重大突破,发现了多个储量超过1000×108m 3

的大

型天然气田[7]。在渤海湾盆地也发现了一些中小规模

的源自上古生界的天然气藏,如在黄骅坳陷发现了乌马营上古生界生、下古生界储的天然气藏[8Ο9],预测天

然气储量为660×108m 3,在东濮凹陷发现了文23井区上古生界生、下第三系储的天然气藏,探明天然气储

量为150×108m 3

。最近又分别在济阳坳陷和东濮凹陷发现了孤北古1井区和文古2井区天然气藏,实现了