沉积事件对深水沉积过程的影响——以鄂尔多斯盆地华庆地区长6油层组为例

doi:10.12108/yxyqc.20190103

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (1): 20–29.doi: 10.12108/yxyqc.20190103

沉积事件对深水沉积过程的影响——以鄂尔多斯盆地华庆地区长6油层组为例

傅强¹, 李璟¹, 邓秀琴², 赵世杰¹, 庞锦莲², 孟鹏飞¹

1. 同济大学海洋地质国家重点实验室, 上海 200092;
2. 中国石油长庆油田分公司勘探开发研究院, 西安 710081

收稿日期:2018-06-05 修回日期:2018-08-23 出版日期:2019-01-18 发布日期:2019-01-18
第一作者:傅强(1964-),男,博士,教授,博士生导师,主要从事石油与天然气地质学的教学和科研工作。地址:(200092)上海杨浦区四平路1239号同济大学海洋与地球科学学院。Email:fuqiang@tongji.edu.cn。
基金资助:
国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（编号：2016ZX05050）和“鄂尔多斯盆地中生界低渗透储层精细描述技术”（编号：2017ZX050001002）资助

Influence of sedimentary events on deep water sedimentation process: a case of Chang 6 reservoir in Huaqing area,Ordos Basin

FU Qiang¹, LI Jing¹, DENG Xiuqin², ZHAO Shijie¹, PANG Jinlian², MENG Pengfei¹

1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China

Received:2018-06-05 Revised:2018-08-23 Online:2019-01-18 Published:2019-01-18

摘要/Abstract

摘要： 鄂尔多斯盆地华庆地区长6油层组的厚层砂岩为深水沉积。为研究该地区深水沉积过程和岩石成因机理，基于岩心观察、测井和录井资料以及岩石样品的分析测试资料，对华庆地区长6油层组深水沉积物在沉积期所遭受的重力流事件、火山事件、地震事件和缺氧事件进行了系统研究。结果表明：①重力流沉积事件在整个沉积过程中频繁发生，是造成砂体在深湖区大面积多层堆积的直接原因；②火山活动的强度和影响范围相对于长7油层组沉积期较小，凝灰质泥岩平均厚度仅为1.74 m，且主要分布在长6₂~6₃砂层组中，形成凝灰质泥岩的火山灰主要以河流搬运方式进入湖盆沉积；③岩心上的沉积构造特征反映了地震事件频繁发生，推测震级约为4.5~5.5级；④上述地质事件的共同作用导致了沉积期湖盆的缺氧事件的发生，致使深湖区沉积了富含有机质的烃源岩，与储集砂体在纵向上构成了良好的生储盖组合。

关键词: 深水沉积, 重力流事件, 火山事件, 地震事件, 缺氧事件, 延长组, 华庆地区, 鄂尔多斯盆地

Abstract: The thick sandstone of Chang 6 reservoir in Huaqing area,Ordos Basin,is considered as the result of deep-water deposition. The data of core photographs,wire-logging,mud-logging and rock samples analysis were used to analyze sedimentary process in deep-water area and petrogenesis mechanism,including four main sedimentary events(gravity flow event,volcanic event,seismic event,and hypoxic event)happened in deep-water deposition process in Chang 6 reservoir. The results show that:(1)Gravity flow deposition events occurred frequently during the whole deposition process,which is the direct cause of large-area multi-layer accumulation of sand bodies in the deep-water area.(2)The intensity and influence range of volcanic activity in Chang 6 deposition period is much smaller than that in Chang 7,only with 1.74 m of average thickness of tuffaceous mudstones which are mainly distributed in Chang 6₂ and Chang 6₃ sandstone. Based on locations and sizes of tuffaceous mudstone developed,volcanic ash was considered add into the basin by river carrying.(3)The sedimentary tectonic features of core reflect the frequent occurrence of seismic events,and the magnitude of the earthquake is estimated to be about 4.5-5.5.(4)The combination of the above sedimentary events led to the occurrence of hypoxic events during the depositional period,and as a result,the source rocks rich in organic matter were deposited in the deep-water area,which formed a good source-reservoir-cap assemblage with reservoir sand bodies vertically.

Key words: deep-water deposition, gravity flow events, volcanic event, seismic event, hypoxic event, Yanchang Formation, Huaqing area, Ordos Basin

中图分类号:

T122

傅强, 李璟, 邓秀琴, 赵世杰, 庞锦莲, 孟鹏飞. 沉积事件对深水沉积过程的影响——以鄂尔多斯盆地华庆地区长6油层组为例[J]. 岩性油气藏, 2019, 31(1): 20–29.

FU Qiang, LI Jing, DENG Xiuqin, ZHAO Shijie, PANG Jinlian, MENG Pengfei. Influence of sedimentary events on deep water sedimentation process: a case of Chang 6 reservoir in Huaqing area,Ordos Basin[J]. Lithologic Reservoirs, 2019, 31(1): 20–29.

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沉积事件对深水沉积过程的影响——以鄂尔多斯盆地华庆地区长6油层组为例

Influence of sedimentary events on deep water sedimentation process: a case of Chang 6 reservoir in Huaqing area,Ordos Basin

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