中国石油勘探 ›› 2017, Vol. 22 ›› Issue (4): 61-72.DOI: 10.3969/j.issn.1672-7703.2017.04.006

• 石油地质 • 上一篇    下一篇

冀中坳陷保定凹陷油气勘探前景与突破口选择

韩春元1, 师玉雷1, 刘静1, 高正虹1, 赵文龙1, 罗路尧2   

  1. 1 中国石油华北油田公司;
    2 长江大学地球物理与石油资源学院
  • 收稿日期:2016-04-07 修回日期:2017-04-25 出版日期:2017-07-15 发布日期:2017-07-14

Prospect and breakthrough point of oil and gas exploration in Baoding sag,Jizhong depression

Han Chunyuan1, Shi Yulei1, Liu Jing1, Gao Zhenghong1, Zhao Wenlong1, Luo Luyao2   

  1. 1 PetroChina Huabei Oilfield Company;
    2 Geophysics and Oil Resource Institute, Yangtze University
  • Received:2016-04-07 Revised:2017-04-25 Online:2017-07-15 Published:2017-07-14

摘要: 基于地震、钻井、分析化验等资料,在成盆背景、结构特点和沉积特征研究基础上,采用烃源岩测井评价和盆地模拟资源评价技术,对冀中坳陷保定凹陷古近系孔店组—沙四段烃源岩和资源潜力进行系统评价,综合分析其油气勘探前景与有利勘探方向。研究表明,保定凹陷为受太行山东断裂带控制形成的西断东超的箕状断陷,与冀中坳陷西部的廊固、徐水、石家庄等凹陷具有相似的成盆背景与构造—沉积演化特征。古近系孔店组—沙四段沉积期,保定凹陷北部与霸县凹陷淀北洼槽、徐水凹陷相互连通,为同一汇水湖盆,发育沙四段—孔一段、孔二段—孔三段两套咸化半深湖—深湖相烃源岩,其中有机碳含量大于2%的优质烃源岩分布面积分别为1470km2和910km2,洼槽区厚度为10~140m。保定凹陷预测石油资源量为(1.27~2.03)×108t,天然气资源量为(270.24~333.29)×108m3,这些油气资源主要聚集于潜山层系和孔店组。该凹陷具备良好的油气勘探前景,区内“洼中隆”型清苑潜山披覆背斜构造成藏条件良好,可形成“新生古储”型潜山油气藏和孔一段构造油气藏,是有利的勘探突破口之一。

关键词: 资源潜力, 勘探突破口, 古近系, 保定凹陷, 冀中坳陷

Abstract: Based on seismic, drilling and chemical analysis data, and studies on basin development background and structural and depositional characteristics, the source rock and resource potential in the Paleogene Kongdian Formation and the fourth member of the Shahejie Formation (Sha 4 Member) in the Baoding sag, the Jizhong depression, were analyzed synthetically using logging evaluation and basin simulation techniques, and the prospect and favorable targets of oil and gas exploration were predicted. The study shows that the Baoding sag is a dustpanlike faulted depression which is faulted on the west and overlaid on the east, under the control of the fault belt on the east of the Taihang Mountain, and it has similar basin-forming background and tectonic-sedimentary evolution process as the sags on the west of the Jizhong depression, such as the Langgu sag, the Xushui sag and the Shijiazhuang sag. During the deposition of the Paleogene Kongdian Formation and Sha 4 Member, the northern part of the Baoding sag connected to the Dianbei subsag of the Baxian sag and the Xushui sag in the same confluence lake basin, where two sets of brackish semi-deep and deep lacustrine source rocks were developed, i.e. the fourth member of the Shahejie Formation-the first member of the Kongdian Formation (Sha 4-Kong 1), and the second member of the Kongdian Formation-the third member of the Kongdian Formation (Kong 2-Kong 3). The distribution area of high quality source rocks with TOC of more than 2% is 1470 km2 and 910 km2, respectively, and the thickness is 10-140 m in the subsags. The estimated oil resources and gas resources are (1.27-2.03)×108t and (270.24-333.29)×108m3 respectively in the Baoding sag, which mainly accumulate in the buried hill and the Kongdian Formation. The sag has good prospect of oil and gas exploration. In the sag, the drape anticline in the "uplift-in-sag" Qingyuan buried hill provides good accumulation conditions, which can develop into buried hill reservoirs with "new source rocks and old reservoir beds" and structural reservoirs in Kong 1 Member as favorable exploration breakthrough points.

Key words: resource potential, exploration breakthrough point, Paleogene, Baoding sag, Jizhong depression

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