| 苏北盆地高邮凹陷古近系戴南组沉积相及其与隐蔽油气藏的关系 |
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| 引用本文： | 张喜林,朱筱敏,钟大康,梁兵,曹冰,杨立干.苏北盆地高邮凹陷古近系戴南组沉积相及其与隐蔽油气藏的关系[J].古地理学报,2005,7(2):207-218. |
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| 作者姓名： | 张喜林 朱筱敏 钟大康 梁兵 曹冰 杨立干 |
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| 作者单位： | 1.石油大学资源与信息学院;2.中石化江苏油田地质研究院 |
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| 基金项目： | 中国石油化工集团公司资助项目 |
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| 摘 要： | 苏北盆地高邮凹陷是江苏油田的主要油气勘探开发区，是一个南断北超的典型箕状断陷湖盆，其中的古近系戴南组为一套厚度近2 000 m的河湖相砂泥岩地层，从下到上分为一段和二段。通过沉积充填分析和沉积相编图，戴南组一段沉积时，苏北盆地断陷构造活动相对强烈，地形高差大，水体相对较深，水体范围相对较小，从南向北分别发育近岸水下扇、湖底扇、三角洲等沉积相类型。戴南组二段沉积时，构造活动有所减弱，地形高差变小，水体相对较浅，水体范围扩大至整个凹陷，从南向北分别发育扇三角洲、湖底扇、三角洲等沉积相类型。利用砂岩等厚图等资料，确定了戴南组的沉积相图。沉积相在平面上分布范围明确，纵向上既有差异性又有继承性。高邮凹陷边缘和内部的同沉积断层对沉积相和砂体的发育分布起着重要的控制作用，沉积相控制了油气分布，特别是对隐蔽油气藏形成起重要作用。高邮凹陷戴南组的隐蔽圈闭类型主要有地层超覆、断层-岩性、砂岩上倾尖灭及透镜体圈闭等。湖底扇、三角洲前缘、扇三角洲前缘、近岸水下扇中扇等为有利的储集岩相带。结合石油地质条件的分析，确定了联18-马18井区等几个有利的隐蔽油藏勘探区。
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| 关 键 词： | 苏北盆地 高邮凹陷 古近系 戴南组 沉积相 隐蔽圈闭 |
| 文章编号： | 1671-1505(2005)02-0207-12 |
| 修稿时间： | 2004年5月6日 |
Sedimentary facies and its controlling on subtle oil and gas reservoirs of the Dainan Formation of Paleogene in Gaoyou Sag,Subei Basin |
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| ZHANG Xilin,Zhu Xiaomin,ZHONG Dakang,Liang Bing,Cao Bing,Yang Ligan.Sedimentary facies and its controlling on subtle oil and gas reservoirs of the Dainan Formation of Paleogene in Gaoyou Sag,Subei Basin[J].Journal of Palaeogeography,2005,7(2):207-218. |
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| Authors: | ZHANG Xilin Zhu Xiaomin ZHONG Dakang Liang Bing Cao Bing Yang Ligan |
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| Institution: | 1.Faculty of Resources and Information, University of Petroleum, Beijing 102249;2.Jiangsu Oilfield Branch Company, SINOPEC, Yangzhou 225009,Jiangsu |
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| Abstract: | The Gaoyou Sag of Subei Basin is one of the key oil and gas exploring and developing areas in Jiangsu Oilfield, and is a typical dustpan shaped subsidence lacustrine basin with a fault as its south boundary and a slope to the north. The Dainan Formation in Gaoyou sag is 2000 m thick and comprises mainly of fluvial-lacustrine sandstone and mudstone, and is divided into 2 Members and Member 1 is of the lower part. Depositional filling process of Dainan Formation was analyzed and sedimentary facies maps were drawn. When the Member 1 was deposited, the tectonic activity of the basin was comparatively stronger and altitude difference between the boundary and the sag was comparatively bigger. Comparatively, the water was deeper and the scope of water was smaller. Consequently, proximal subaqueous fan, sublacustrine fan and delta facies were developed from south to north respectively. When the Member 2 of Dainan Formation was deposited, the tectonic activity was comparatively weaker and altitude difference between the boundary and the sag became smaller. The water was shallower and the sag was entirely covered by water. Consequently, fan delta, sublacustrine fan and delta facies were developed from south to north respectively. The maps of sedimentary facies of Dainan Formation were drawn based on the thickness isoline maps of sandstone and other data. The sedimentary facies were developed in specific places in plane and shows differences and hereditability in vertical evolution. The syndepositional faults, either as boundary or within Gaoyou Sag, were key factors in controlling the distribution of sedimentary facies and sandbodies. The development of sedimentary facies controls the development and distribution of oil and gas reservoirs, especially subtle ones. The main subtle traps of Dainan Formation in Gaoyou Sag are stratigraphic overlapping, fault-lithologic, upward thinout and lenticular ones. The favored oilbearing facies include sublacustine fan, delta front, fan delta front and the central part of subaqueous fan facies. With the data mentioned above plus analysis on the petroleum geologic conditions, several favorable subtle trap exploring areas are put forward. |
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| Keywords: | Subei Basin Gaoyou Sag Paleogene Dainan Formation sedimentary facies subtel trap |
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