辽中北洼东部陡坡带走滑转换带特征及其油气富集贫化作用  被引量:1

Characteristics and hydrocarbon enrichment/dilution of strike-slip transfer zone in the eastern steep slope of northern Liaozhong subdepression

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作  者:张明升 王德英 王冰洁 杨传超 戴建芳 Zhang Mingsheng;Wang Deying;Wang Bingjie;Yang Chuanchao;Dai Jianfang(Tianjin Branch of CNOOC Ltd.,Tianjin 300459)

机构地区:[1]中海石油(中国)有限公司天津分公司,天津300459

出  处:《地质科学》2024年第4期1070-1081,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基  金:中海油科技项目“渤海油田上产4000万吨新领域勘探关键技术”(编号:CNOOC‑KJ‑135‑ZDXM‑36‑TJ‑08‑TJ)资助。

摘  要:走滑转换带对油气聚集成藏具有重要控制作用,但辽中北洼东陡坡走滑转换带在含油层系以及油气丰度上存在巨大差异,成藏认识不清晰,勘探层系不明确。利用三维地震资料及钻探成果,将辽中北洼东部陡坡带及辽东凸起走滑转换带划分为“S”型增压转换带、马尾型释压转换带、叠覆型增压及释压转换带4种类型。释压转换带与增压转换带依次交替发育,不同类型具有不同的构造特征。走滑转换带控制油气的富集与贫化。走滑转换带是圈闭发育场所,受拉张和挤压应力场影响,相应发育大量的断块和断背斜圈闭。释压型转换带形成低势区,成为优势的汇水通道及汇水区,是富砂沉积体优势发育地带。释压转换带断层开启,是油气垂向运移的有利通道,调节深层油气至浅层圈闭成藏,具有深层贫油-浅层富油的特征。增压型转换带断层闭合程度高,油气垂向及侧向封闭能力均优越,有利于油气保存,具有深层富油-浅层贫油的特征。Strike-slip transfer zone plays an important role in controlling oil and gas accumulation.There are significant differences in the oil-bearing series and oil and gas abundance of the strike slip zone on the eastern steep slope of the northern Liaozhong subdepression,and the understanding of reservoir formation is unclear,and the exploration layer series is indeterminate.Based on three-dimensional seismic data and drilling results,the strike-slip transfer zones in eastern steep slope zone of northern Liaozhong subdepression and Liaodong uplift are divided into four types:S-shaped contractional transfer zone,horsetail extensional transfer zone,overlapping contractional transfer zone and overlapping extensional transfer zone.The contractional transfer zone and extensional transfer zone are developed alternately,and different types have different structural characteristics.The strike-slip transfer zone controls the enrichment and dilution of oil and gas.The strike-slip transfer zone is a favorable place for the formation of traps,and a large number of fault block and faulted anticline traps are developed correspondingly under the influence of extensional and contractional stress field.The extensional transfer zone forms a low potential area,becomes a dominant catchment channel and catchment area,and is the dominant development zone of sand rich sedimentary bodies.The opening of the fault in the extensional transfer zone is a favorable channel for the vertical migration of oil and gas,regulates the accumulation of deep oil and gas to shallow traps,and has the characteristic of deep oil poor-shallow oil rich.The contractional transfer zone has high fault closure degree and superior vertical and lateral sealing ability of oil and gas,which is conducive to oil and gas preservation,and has the characteristic of deep oil rich-shallow oil poor.

关 键 词:走滑转换带 发育特征 油气富集贫化 辽中北洼东部陡坡带 辽东湾坳陷 

分 类 号:P542[天文地球—构造地质学] P618[天文地球—地质学]

 

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