岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 45–52.doi: 10.3969/j.issn.1673-8926.2015.05.008

• 油气地质 • 上一篇    下一篇

黄河口凹陷 BZ-A-1 井区沙河街组“甜点”特征及成因机制

王 维1,张英波1,杨香华1,王清斌2,朱红涛1   

  1.  1. 中国地质大学(武汉),武汉 430074 ; 2. 中海石油(中国)有限公司天津分公司,天津 300457
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 第一作者:王维( 1988- ),男,中国地质大学(武汉)在读博士研究生,研究方向为储层地质学。 地址:( 430074 )湖北省武汉市洪山区鲁磨路 388 号中国地质大学资源学院。 E-mail : wangweiylcug@163.com
  • 基金资助:

    国家重大油气专项子课题“富烃凹陷特征及类比研究”(编号: 2011ZX05023-001-001 )和国家自然科学基金项目“陆相断陷盆地低—高角度同沉积断层序 - 沉积充填响应过程、样式及差异”(编号: 41572084 )联合资助

Characteristics and genetic mechanism of “ sweet spots ” of Shahejie Formation in BZ-A-1 well field, Huanghekou Sag

Wang Wei1, Zhang Yingbo1, Yang Xianghua1, Wang Qingbin2, Zhu Hongtao1   

  1.  1. China University of Geosciences , Wuhan 430074 , China ; 2. Tianjin Branch of CNOOC Ltd. , Tianjin 300457 , China )
  • Online:2015-09-26 Published:2015-09-26

摘要:

黄河口凹陷 BZ-A-1 井区沙河街组沙一段和沙二段发育致密砂岩,其致密成因主要为碳酸盐致密胶结。 研究发现低孔、低渗砂岩中存在相对优质的储集层段。 以电子背散射与能谱分析及阴极发光为主要技术手段,结合铸体薄片和 X 射线衍射等相关分析,对研究区沙一段和沙二段优质储层特征、成因机制及储层控制因素进行了分析。 沙二段优质储层为栉壳状白云石包壳砂岩,其储集空间主要为白云石晶间孔,白云石包壳可以有效抑制深部储层压溶作用及石英加大边的生长。 沙一段沉积早期,在半封闭水体蒸发环境下,受碱性湖水与陆源碎屑的双重影响,发育了生屑云岩、含生屑混积岩及泥晶云质细砂岩等相对优质储层。 白云石化及溶蚀作用是该区沙一段与沙二段优质储层发育的主要成因。

关键词: 成藏规律, 优势运聚, 拆离断裂, 白云东洼

Abstract:

 The tight reservoir of Shahejie Formation in BZ-A-1 well field in Huanghekou Sag is mainly due to carbonate cementation. However, there are relatively high quality reservoirs developed in low porosity and low permeability sandstones. The characteristics, genetic mechanism and controlling factors of the high quality reservoirs in the first and second members of Shahejie Formation were studied by the means of backscatter, energy spectrum,cathodeluminescence, X-ray diffraction and SEM. The results show that high quality reservoirs of the second member of Shahejie Formation are the sandstones with dolomite membrane. The membrane can effectively inhibit the pressure solution of the quartz and the growth of secondary quartz edge. The burial dolomitization and the dissolution by acid fluid in the late stage played an positive role in reservoir development. The evaporitic environment of semi-closed water in the early stage of the first member of Shahejie Formation led to the development of biodetritus beach in the high part. Together with the impacts of both the alkaline water and terrigenous fresh water, three kinds of high quality reservoirs deposited, including bioclastic dolostones, hunji rocks with bioclast and micrite dolomitic fine sandstones.Dolomization and dissolution are the main causes of pore development.

Key words: accumulation regularity, favorable migration and accumulation, detachment faults, eastern Baiyun Sag

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