渤海湾盆地歧北斜坡沙河街组储层特征及形成机理

doi:10.11743/ogg20150213

石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (2): 280-287.doi: 10.11743/ogg20150213

渤海湾盆地歧北斜坡沙河街组储层特征及形成机理

薛宗安^1,2, 赵玉宏³, 吴义平⁴, 朱超⁵, 许海龙⁴, 边海光⁴

1. 中国地质大学, 北京 100083;
2. 中国石油长城钻探工程有限公司, 北京 100101;
3. 绿洲石油有限责任公司, 北京 100011;
4. 中国石油勘探开发研究院, 北京 100083;
5. 中国石油杭州地质研究院, 浙江杭州 310023

收稿日期:2014-07-31 修回日期:2015-01-20 出版日期:2015-04-08 发布日期:2015-05-13
通讯作者: 吴义平(1973-),男,高级工程师,油气地质与勘探.E-mail:wuyiping01@petrochina.com.cn. E-mail:wuyiping01@petrochina.com.cn
第一作者简介:薛宗安(1975-),男,博士研究生,含油气盆地分析.E-mail:xuezongan@126.com.
基金项目:
国家科技重大专项(2011ZX05001).

Characteristics and forming mechanisms of reservoirs in the Shahejie Formation of Qibei slope, Bohai Bay Basin

Xue Zong'an^1,2, Zhao Yuhong³, Wu Yiping⁴, Zhu Chao⁵, Xu Hailong⁴, Bian Haiguang⁴

1. China University of Geosciences, Beijing 100083, China;
2. Geoscience Center of CNPC Greatwall Drilling Company, Beijing 100101, China;
3. AL-WAHA Petroleum Company Ltd., Beijing 100011, China;
4. CNPC Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
5. Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 310023, China

Received:2014-07-31 Revised:2015-01-20 Online:2015-04-08 Published:2015-05-13

摘要/Abstract

摘要：

利用普通薄片、铸体薄片、扫描电镜等实验数据，结合测井资料，分析了渤海湾盆地歧北斜坡沙河街组储层岩石成分、孔渗分布、孔隙结构及储层品质指数（RQI）等特征，探讨了储层形成机理。研究结果表明，沙河街组砂岩成熟度较低，孔隙类型多样，孔隙结构以Ⅳ类为主，孔喉为细-微孔小喉，以次生粒间孔为主，属于典型的低孔低渗储层。储层形成的主控因素有沉积作用、次生溶蚀作用及深部异常高压等。水道沉积环境控制储集岩的碎屑粒度、胶结物性质及含量、孔隙的孔喉半径和分选系数等，水道主体砂岩比侧缘砂体孔隙度高出3%～5%，且厚度较大，易形成良好的储集层。压实作用和胶结作用使原生孔隙消失殆尽，砂岩中长石等的溶蚀作用造成了次生孔隙的发育，为储集空间的主要贡献者。异常压力的发育抑制了压实作用，促进了溶蚀作用，起到了增加储层孔隙的作用。综合分析认为，重力流水道和扇三角洲前缘相带中的次生溶蚀发育带是储层发育的有利区带。

关键词: 溶蚀作用, 次生粒间孔, 异常压力, 低渗透储层, 沙河街组, 歧北斜坡, 渤海湾盆地

Abstract:

Experimental means,including ordinary slices,casting sections and electron microscope,were used to study samples from reservoirs in the Shahejie Formation of Qibei slope in Bohai Bay Basin.The results were then combined with logging data to analyze the features(lithological composition,porosity and permeability distribution,pore texture and re-servoir quality index(RQI))and forming mechanism of the reservoirs.The analyses show that the sandstone reservoirs in the formation are typical low-porosity and low-permeability reservoirs featuring in low maturity,various types of pores,Ⅳ type of pore structure,small-to micro-sized pore throat and secondary intergrannual pores.The forming mechanisms of the reservoirs include sedimentation,secondary dissolution and deep overpressure.It also indicates that sedimentary setting of the channels controlled the particle size,cement properties and content,pore throat size and sorting coefficient of the re-servoirs.Sandstone in the main channels offered better conditions for the forming of reservoirs as it is thicker and has a porosity of 3%-5% higher than that at the side edges.Primary pores in the reservoirs were almost killed during compaction and cementation,while dissolution of feldspar and other minerals created secondary pores and provided reservoir space.Overpressure in the reservoirs restrained compaction but boosted dissolution and enlarged reservoiring space.A comprehensive analysis of all the information suggests that secondary pore zones in gravity flow channels and fan delta fronts be the most favorable locations for reservoirs to develop.

Key words: dissolution, secondary intergranular pore, overpressure, low-permeability reservoir, Shahejie Formation, Qibei slope, Bohai Bay Basin

中图分类号:

TE122.2

薛宗安,赵玉宏,吴义平,等. 渤海湾盆地歧北斜坡沙河街组储层特征及形成机理[J]. 石油与天然气地质, 2015, 36(2): 280-287. doi: 10.11743/ogg20150213 Xue Zong'an,Zhao Yuhong,Wu Yiping,et al. Characteristics and forming mechanisms of reservoirs in the Shahejie Formation of Qibei slope, Bohai Bay Basin[J]. Oil & Gas Geology, 2015, 36(2): 280-287. doi: 10.11743/ogg20150213

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渤海湾盆地歧北斜坡沙河街组储层特征及形成机理

Characteristics and forming mechanisms of reservoirs in the Shahejie Formation of Qibei slope, Bohai Bay Basin

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