中国石油勘探 ›› 2017, Vol. 22 ›› Issue (5): 88-95.DOI: 10.3969/j.issn.1672-7703.2017.05.010

• 石油地质 • 上一篇    下一篇

苏北盆地海安凹陷阜三段油气成藏控制因素分析

钱诗友, 卢黎霞, 程海生, 杨立干   

  1. 中国石化江苏油田分公司勘探开发研究院
  • 收稿日期:2016-07-05 修回日期:2017-05-14 出版日期:2017-09-15 发布日期:2017-09-13

Analysis of controlling factors for hydrocarbon accumulation of Fu3 Member, in Haian sag, Subei Basin

Qian Shiyou, Lu Lixia, Cheng Haisheng, Yang Ligan   

  1. Research Institute of Exploration and Development of Jiangsu Oilfield Company, Sinopec
  • Received:2016-07-05 Revised:2017-05-14 Online:2017-09-15 Published:2017-09-13

摘要: 近年来,苏北盆地海安凹陷曲塘次凹阜三段勘探不断取得新发现,相继发现张家垛及曲1块等油藏,进一步展示出该套层系良好的勘探前景。通过对海安凹陷阜三段典型油藏解剖及油气分布特征分析,认识到阜三段油气富集主要受良好的构造背景、源-储-盖配置及异常高压条件控制。进一步研究认为:烃源岩演化差异是造成次凹间阜三段油气发现贫富差异的根本原因;长期持续活动的油源断层对阜三段成藏起到重要作用;砂体展布及地质结构空间的合理配置有利于在南部次凹斜坡形成断层-岩性、砂岩上倾尖灭等类型隐蔽圈闭。在此基础上,指出海安凹陷除曲塘次凹外,北部孙家洼次凹、丰北次凹及富安次凹近凹地区阜三段成藏条件配置较为有利,以寻找构造油藏为主;南部新街次凹和海北次凹砂地比较低,为岩性油藏勘探有利地区。

关键词: 海安凹陷, 阜三段, 油气成藏, 主控因素

Abstract: In the past few years, new discoveries (Zhangjiaduo and Qu1 Block oil pools etc.) have been continuously obtained in exploring the Fu3 Member of the Qutang sub-sag in Haian sag, Subei Basin. which further presents favorable exploration prospect within this formation. By dissecting typical oil pools and analyzing hydrocarbon distribution features in the Fu3 Member of the Haian sag, it is realized that hydrocarbon accumulation in the Fu3 Member is mainly controlled by fine tectonic background, source-reservoir-caprock assemblage and abnormal pressure. Further studies indicate that:(1) the evolution difference of source rocks is crucial for hydrocarbon enrichment difference of the Fu3 Member in various sub-sags; (2)the oil-source faults with continuous long-term activities played important role for hydrocarbon accumulation in the Fu3 Member; (3) reasonable configuration between sand body distribution and geologic structure space was favorable for forming subtle traps (such as fault-lithology and sand updippinchout traps) in southern sub-sags. Based on the above, it has concluded that except for the Qutang sub-sag, the Fu3 Member in the regions near the Sunjiawa sub-sag, Fengbei sub-sag and Fuan sub-sag in the north have relatively favorable hydrocarbon accumulation conditions, and the major exploration target is tectonic oil pools; the Xinjie sub-sag and Haibei sub-sag in the south have lower sand ratios, being favorable regions for exploring lithological oil pools.

Key words: Haian sag, Fu3 Member, hydrocarbon accumulation, major controlling factor

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