南堡凹陷奥陶系碳酸盐岩岩溶残丘圈闭勘探潜力及意义

doi:10.7623/syxb201506002

石油学报 ›› 2015, Vol. 36 ›› Issue (6): 653-663.DOI: 10.7623/syxb201506002

南堡凹陷奥陶系碳酸盐岩岩溶残丘圈闭勘探潜力及意义

董月霞¹, 赵宗举², 曹中宏³, 汪建国², 龚发雄³, 王培玺², 吴和源⁴, 曹芮宁⁵, 邹刚²

1. 中国石油冀东油田公司河北唐山 063004;
2. 中国石油学会北京 100724;
3. 中国石油冀东油田公司勘探开发研究院河北唐山 063004;
4. 中国地质大学地球科学与资源学院北京 100083;
5. 中国地质大学海洋学院北京 100083

收稿日期:2015-03-26 修回日期:2015-05-09 出版日期:2015-06-25 发布日期:2015-08-06
作者简介:董月霞,女,1968年5月生,1990年获大庆石油学院石油地质专业学士学位,2002年获中国地质大学(武汉)地球科学学院理学博士学位,现为中国石油冀东油田公司总地质师、教授级高级工程师,主要从事油气勘探地质综合研究与油气田勘探生产实践工作。Email:dongyx@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05006)及中国石油冀东油田公司项目(2013-JS-231)资助。

Exploration potential and significance of Ordovician carbonate karst monadnock traps in Nanpu sag

Dong Yuexia¹, Zhao Zongju², Cao Zhonghong³, Wang Jianguo², Gong Faxiong³, Wang Peixi², Wu Heyuan⁴, Cao Ruining⁵, Zou Gang²

1. PetroChina Jidong Oilfield Company, Hebei Tangshan 063004, China;
2. Chinese Petroleum Society, Beijing 100724, China;
3. Research Institute of Exploration and Development, PetroChina Jidong Oilfield Company, Hebei Tangshan 063004, China;
4. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
5. School of Ocean Sciences, China University of Geosciences, Beijing 100083

Received:2015-03-26 Revised:2015-05-09 Online:2015-06-25 Published:2015-08-06

摘要/Abstract

摘要：

通过岩心描述、露头观察、成像测井解释、试油资料统计及地震剖面解释,结合区域地质资料分析,借鉴鄂尔多斯盆地、塔里木盆地及渤海湾盆地下古生界碳酸盐岩潜山岩溶储层形成及成藏模式,深入研究了南堡凹陷奥陶系碳酸盐岩潜山岩溶储层的特征及主控因素、发育模式,提出南堡凹陷奥陶系潜山岩溶残丘圈闭是该区下古生界潜山油气勘探的潜在新领域。南堡凹陷奥陶系潜山岩溶储层主要是缝洞型储层,垂向上主要分布于水平潜流带及垂直渗流带,有利储层主要分布于潜山不整合面之下<100 m的范围内、少数也可深达200 m以上。该储层的形成主要受控于喜马拉雅期暴露大气淡水溶蚀作用,当时的岩溶古地貌及断裂-裂缝的发育控制了奥陶系潜山岩溶储层的发育与分布,南堡凹陷中南部总体处于岩溶斜坡并形成了优质的潜流带缝洞储层,仅其中的次级高地因发育风化残积层及垂直渗流带较厚等原因导致储层变差。亮甲山组顶部及下马家沟组顶部分别发育1套厚达20~30 m的膏溶角砾岩,因其泥质含量高可作为油气盖层/隔层,与上覆古近系—白垩系区域盖层及下马家沟组、上马家沟组2套潜山岩溶储层形成2套有利储盖组合,并在南堡凹陷中南部斜坡区形成多个岩溶残丘地层-成岩岩性圈闭,成为南堡凹陷下古生界潜山有利油气勘探新领域。类似潜山岩溶残丘圈闭在渤海湾盆地其他地区如冀中坳陷、黄骅坳陷大港油田探区及济阳坳陷也有分布,可作为渤海湾盆地下古生界潜山油气勘探的新领域,值得深入研究与探索。

关键词: 岩溶残丘圈闭, 潜山, 缝洞储层, 岩溶古地貌, 碳酸盐岩, 奥陶系, 南堡凹陷, 渤海湾盆地

Abstract:

Based on core description, outcrop observation, imaging logging interpretation, oil testing data statistics and seismic profile interpretation in combination with regional geological data analysis, as well as the formation and accumulation modes of Lower Paleozoic carbonate buried-hill karst reservoirs in Ordos Basin, Tarim Basin and Bohai Bay Basin, a deep study was carried out on the characteristics, main controlling factors and development modes of Ordovician carbonate buried- hill karst reservoirs in Nanpu sag. It was put forward that the Ordovician buried-hill karst monadnock traps in Nanpu sag were a new potential field for Lower Palaeozoic buried-hill hydrocarbon exploration in this region. The Ordovician buried-hill karst reservoirs in Nanpu sag are dominated by fracture-cave reservoirs, mainly distributed in horizontal phreatic zone and vertical vadose zone in the vertical profile. Favorable reservoirs are primarily distributed beneath the buried-hill unconformity surface within the depth of 100 m, while a few can reach the depth of more than 200 m. The reservoir formation was mainly controlled by Himalayan exposed atmospheric fresh water dissolution. In the meantime, the development and distribution of Ordovician buried-hill karst reservoirs was controlled by the development of karst paleo-geomorphology and fault-fractures. The south-central Nanpu sag is generally located in karst slopes and form high-quality phreatic-zone fracture-cave reservoirs. while the reservoirs become poor in secondary highlands due to the development of weathering eluvium and thick vertical vadose zones, etc. A set of 20-30-m-thick gypsum breccias are developed at the top of Liangjiashan Formation and Lower Majiagou Formation respectively, which can be taken as hydrocarbon caps/barriers because of high shale content. In combination with the overlying Paleogene-Cretaceous regional caps and two sets of buried-hill karst reservoirs in Lower and Upper Majiagou Formation, two sets of favorable reservoir-cap assemblages were formed, as well as multiple karst monadnock reservoirs and diagenetic lithologic traps in the central and southern slopes of Nanpu sag, thus forming a new field for favorable Lower Palaeozoic buried-hill hydrocarbon exploration in Nanpu sag. Similar buried-hill karst monadnock traps are also distributed in other areas of Bohai Bay Basin, such as Central Hebei Depression, Dagang oilfield exploration area of Huanghua Depression and Jiyang Depression, which can be used as a new field for Lower Palaeozoic buried-hill hydrocarbon exploration in Bohai Bay Basin, which is worthy of further research and exploration.

Key words: karst monadnock trap, buried-hill, fracture-cave reservoir, karst palaeogeomorphology, carbonate, Ordovician, Nanpu sag, Bohai Bay Basin

中图分类号:

TE112.3

董月霞, 赵宗举, 曹中宏, 汪建国, 龚发雄, 王培玺, 吴和源, 曹芮宁, 邹刚. 南堡凹陷奥陶系碳酸盐岩岩溶残丘圈闭勘探潜力及意义[J]. 石油学报, 2015, 36(6): 653-663.

Dong Yuexia, Zhao Zongju, Cao Zhonghong, Wang Jianguo, Gong Faxiong, Wang Peixi, Wu Heyuan, Cao Ruining, Zou Gang. Exploration potential and significance of Ordovician carbonate karst monadnock traps in Nanpu sag[J]. Acta Petrolei Sinica, 2015, 36(6): 653-663.

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南堡凹陷奥陶系碳酸盐岩岩溶残丘圈闭勘探潜力及意义

Exploration potential and significance of Ordovician carbonate karst monadnock traps in Nanpu sag

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