冀中坳陷保定凹陷油气勘探前景与突破口选择

发布时间：2018-08-31 12:17

【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1470km~2和910km~2,洼槽区厚度为10~140m。保定凹陷预测石油资源量为(1.27~2.03)×10~8t,天然气资源量为(270.24~333.29)×10~8m~3,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。
[Abstract]:Based on seismic, drilling, analytical and laboratory data, based on the study of basin background, structural characteristics and sedimentary characteristics, hydrocarbon source rock logging evaluation and basin simulation resource evaluation techniques are adopted. The hydrocarbon source rocks and resource potential of Gongdian formation-Sha 4 member of Paleogene in Baoding depression of Jizhong depression are systematically evaluated and their oil and gas exploration prospects and favorable exploration directions are comprehensively analyzed. The study shows that Baoding sag is a dustpan shaped depression controlled by the Taihang Shandong fault zone, and has similar basin setting and tectonic-sedimentary evolution characteristics as the Langgu, Xushui and Shijiazhuang sag in the west of Jizhong depression. During the sedimentary period of the Kongdian formation and the fourth member of the Shahejie formation in the Paleogene, the northern Baoding sag and the northern Dianbei depression of the Baxian sag are connected to each other, which is the same catchment lake basin. There are two sets of halo-deep lacustry-deep lacustrine source rocks in the second and third member of the pore. The distribution area of the high quality source rocks with organic carbon content more than 2% is 1470km~2 and 910km2, respectively, and the thickness of the depression area is 1010 ~ 140m. The predicted oil resources and natural gas resources in Baoding sag are (1.27 ~ 2.03) 脳 10 ~ (8) t and (270.24) ~ (333.29) 脳 10 ~ (8) m ~ (-1) 路m ~ (3) respectively. These oil and gas resources are mainly concentrated in buried hill series and Kongdian formation. The sag has a good prospect for oil and gas exploration. The structure of Qingyuan buried hill in "middle uplift" type in this area has good reservoir forming conditions, which can form a "new ancient reservoir" type buried hill reservoir and a structural reservoir in the first section of the pore, which is one of the favorable breakthrough points for exploration.
【作者单位】：中国石油华北油田公司;长江大学地球物理与石油资源学院;
【基金】：国家科技重大专项“冀中坳陷增储领域地质评价与勘探实践”(2016ZX05006005-003)
【分类号】：P618.13

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