文章摘要
秦皇岛29-2油田和 伊拉克米桑油田混合沉积储层对比分析
Comparison and analysis on diamictite reservoir in QHD 29-2 oilfield and Iraq Missan oilfield
投稿时间:2022-06-27  修订日期:2022-06-27
DOI:
中文关键词: 混合沉积,沙二段,Asmari组,储层对比
英文关键词: diamictite reservoir  Sha1 and Sha2 members  Asmari formation  Reservoir Comparison and analysis
基金项目:“十三五”国家重大专项“海外重点油气田开发钻采关键技术,国家科技攻关计划
作者单位邮编
倪军娥 中海油研究总院 100028
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中文摘要:
      渤海海域石臼坨凸起东段秦皇岛29-2油田和伊拉克米桑油田均发育混合沉积。但两者的储层岩性、物性及展布特征差异较大。本文通过分析岩心、薄片、物性、孔喉结构等数据,综合对比湖相混合沉积和海相混合沉积在储层岩性、储集空间、沉积模式上的相同点及差异,并分析优质储层的主控因素。研究发现:两者都具有岩性复杂多样、物性差异大的特点,秦皇岛29-2油田沙二段储层厚度变化大且规模有限,优质储层是生屑云岩,碎屑岩储层较差,湖相混积岩储层物性与生物碎屑含量紧密相关,生物碎屑含量越高,储层物性越好。而伊拉克米桑油田储层厚度稳定且分布广泛,优质储层主要是石英砂岩,碳酸盐岩储层较差,混积岩介于两者间。两者储集空间均以次生溶蚀孔隙为主,残余原生孔隙度不高,部分颗粒间少量原生孔隙在一定条件作用下得到很好的保存,其中秦皇岛29-2油田沙二段受到淡水淋滤作用,而伊拉克米桑油田Asmari组由于构造作用形成大量微裂缝,增加了储集空间和储层连通性。两者沉积环境和物源供给的差异导致储层规模和分布特征差异
英文摘要:
      The diamictite reservior are both developed in Shahejie Formation, QHD 29-2 oilfield in Shijiutuo uplift, Bozhong depression and Asmari Formation in the Missan oilfield,Iraq. There are some similarity of these two oilfields, clastic rock and carbonate rock deposits are developed at the same time, and they mixed in varying degrees. But, the reservoir lithology, distribution and physical properties are great different.Based on core, thin section,physical properties, mercury injection combined with the analysis on the regional tectonic setting, sediment supply,paleogeomorphological and paleoclimatic data,we studied the petrologic characteristics, sedimentary facies as well as the depositional models.Bioclastic dolomite is the high quality reservoir of QHD 29-2 oilfeld, clastic reservoir is poor, as the increase of bioclastic proportion, the physical properties is getting better. quartz sandstone is the best reservoir of Iraq Missan oilfield.The diamictite is the secondary reservoir reservoir in two oilfields.Both reservoir spaces are dominated by secondary dissolution pores,QHD 29-2 oilfield reservoir is affected by leaching freshwater, while Iraq Missan oilfield forms a large number of micro fractures due to tectonic action, which increases reservoir space and reservoir connectivity. They are affected by tectonism, sedimentation and diagenesis. The difference of depositional environment and source supply lead to the difference of reservoir distribution scale.
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