鄂尔多斯盆地西缘古峰庄地区低级序断层封闭性及其控藏作用

doi:10.3969/j.issn.1672-7703.2019.01.008

中国石油勘探 ›› 2019, Vol. 24 ›› Issue (1): 72-81.DOI: 10.3969/j.issn.1672-7703.2019.01.008

鄂尔多斯盆地西缘古峰庄地区低级序断层封闭性及其控藏作用

姚泾利^1,2, 周新平^1,2, 惠潇^1,2, 邓秀芹^1,2, 张文选^1,2

1 低渗透油气田勘探开发国家工程实验室;
2 中国石油长庆油田公司勘探开发研究院

收稿日期:2017-08-14 修回日期:2018-08-08 出版日期:2019-01-15 发布日期:2019-01-02
通讯作者: 周新平(1984-),男,湖北安陆人,博士,2013年毕业于中国石油大学(北京),高级工程师,主要从事沉积学及石油地质综合研究工作。地址:陕西省西安市未央区凤城四路长庆科技楼,邮政编码:710018。E-mail:zhxp13_cq@petrochina.com.cn
基金资助:
国家科技重大专项“大型油气田及煤层气开发”（2017ZX05001002），“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（2016ZX05050）；中国石油天然气股份有限公司重大科技专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”（2016E-0501）。

Sealing capabilities and reservoir controlling effects of low-grade faults in Gufengzhuang area, western margin of the Ordos Basin

Yao Jingli^1,2, Zhou Xinping^1,2, Hui Xiao^1,2, Deng Xiuqin^1,2, Zhang Wenxuan^1,2

1 National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields;
2 Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company

Received:2017-08-14 Revised:2018-08-08 Online:2019-01-15 Published:2019-01-02
Supported by:

摘要/Abstract

摘要： 鄂尔多斯盆地西缘古峰庄地区低级序断层发育，断层性质及其封闭性与油藏密切相关，明确该区低级序断层特征及其封闭性对于复杂构造条件下的石油勘探具有重要意义。基于井震结合分析了低级序断层特征，根据断层与成藏匹配关系以及延长组岩性组合特征，运用断-储排替压差法定量评价了断层封闭性。结果表明，低级序断层主要为晚侏罗世-早白垩世末期形成的逆断层，断距小，倾角陡，延伸短，以北西-南东向呈雁行式分带展布。研究区延长组总体为砂泥岩薄互层段，受断层作用易形成断层岩，断层封闭与否取决于断层岩与所对置储层的排替压差。该区断层岩泥质含量为20%~60%，排替压力一般小于1.5MPa，普遍小于对置储层的排替压力，断层以开启为主，仅少数为封闭断层。早白垩世末期，开启断层为石油输导提供了运移通道，受围岩及封闭断层封堵影响，断层附近的低幅度圈闭及相对高渗储集区为石油聚集的有利目标。

关键词: 鄂尔多斯盆地西缘, 低级序断层, 断层封闭性定量评价, 断层岩, 排替压力

Abstract: Low-grade faults are relatively developed in the Gufengzhuang area on the western margin of the Ordos Basin. Their characteristics and sealing capabilities are closely related to hydrocarbon accumulation. It is significant to analyze the characteristics and sealing capacities of the faults for petroleum exploration under the complex tectonic conditions. The characteristics of the low-grade faults was analyzed based on seismic and well data, and the sealing capabilities of the faults were evaluated using the displacement pressure difference between reservoirs and faults, according to the matching relationship between faults and hydrocarbon accumulation and the lithology of the Yanchang Formation. The result indicates that the faults are mainly reversed Late Jurassic to Early Cretaceous faults characterized by small fault throw, large dip and short extension, and in echelon distribution from NW to SE. The Yanchang Formation in the study area is thin interbeds of sandstone and mudstone, which are easy to develop fault rocks, so the sealing capability depends on the displacement pressure difference between the fault rock and related reservoir. The mudstone in the fault rock accounts for 20% to 60%, and the displacement pressure is generally less than 1.5MPa, which is generally smaller than the displacement pressure in the reservoir. Most faults are open, and less are close. During the early time of the Early Cretaceous, the open faults acted as transport systems for hydrocarbon migration, and hydrocarbon accumulated in low-relief traps and high-permeability reservoirs near the faults, controlled by the surrounding rock and sealing faults.

Key words: western margin of the Ordos Basin, low-grade fault, quantitative evaluation of fault sealing capability, fault rock, displacement pressure

中图分类号:

姚泾利, 周新平, 惠潇, 邓秀芹, 张文选. 鄂尔多斯盆地西缘古峰庄地区低级序断层封闭性及其控藏作用[J]. 中国石油勘探, 2019, 24(1): 72-81.

Yao Jingli, Zhou Xinping, Hui Xiao, Deng Xiuqin, Zhang Wenxuan. Sealing capabilities and reservoir controlling effects of low-grade faults in Gufengzhuang area, western margin of the Ordos Basin[J]. China Petroleum Exploration, 2019, 24(1): 72-81.

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鄂尔多斯盆地西缘古峰庄地区低级序断层封闭性及其控藏作用

Sealing capabilities and reservoir controlling effects of low-grade faults in Gufengzhuang area, western margin of the Ordos Basin

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