渤海湾盆地东营凹陷高青地区中生界低渗透碎屑岩有效储层特征及发育控制因素

doi:10.11743/ogg20190206

石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (2): 271-283.doi: 10.11743/ogg20190206

渤海湾盆地东营凹陷高青地区中生界低渗透碎屑岩有效储层特征及发育控制因素

王亚^1,2, 杨少春^1,2, 路研^1,2, 马宝全^1,2, 赵永福^1,3, 王永超^1,2

1. 中国石油大学(华东) 地球科学与技术学院, 山东青岛 266580;
2. 海洋国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266071;
3. 中国石化胜利油田分公司油气勘探管理中心, 山东东营 257017

收稿日期:2018-03-10 修回日期:2018-12-04 出版日期:2019-04-28 发布日期:2019-01-23
通讯作者: 杨少春(1962-),男,博士、教授、博士生导师,油气地质及油藏描述。E-mail:scyang@upc.edu.cn。 E-mail:scyang@upc.edu.cn
作者简介:王亚(1994-),男,博士研究生,油气藏开发地质与岩石物理学。E-mail:wangyayifan@163.com。
基金资助:
国家科技重大专项（2017ZX05009001）；国家自然科学基金项目（41772138）。

Characteristics and controlling factors of effective reservoirs of Mesozoic low-permeability clastic rocks in Gaoqing Region,Dongying Depression, Bohai Bay Basin,China

Wang Ya^1,2, Yang Shaochun^1,2, Lu Yan^1,2, Ma Baoquan^1,2, Zhao Yongfu^1,3, Wang Yongchao^1,2

1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
3. Management Center of Oil and Gas Exploration, SINOPEC Shengli Oilfield Branch Company, Dongying, Shandong 257017, China

Received:2018-03-10 Revised:2018-12-04 Online:2019-04-28 Published:2019-01-23

摘要/Abstract

摘要： 针对东营凹陷高青地区中生界有效储层非均质性强和成岩演化复杂的特点，利用岩石薄片、扫描电镜、阴极发光、高压压汞和流体包裹体等实验分析测试资料，系统研究了中生界有效储层的岩石学、储集和物性特征，并就有效储层和非有效储层在孔隙结构和成岩特征上的差异进行了对比，进一步明确了有效储层发育的控制因素。结果表明：高青地区中生界有效储层中次生孔隙较为发育，储层物性较好，孔隙结构非均质性强，具有中孔喉、小孔喉共存的双峰孔径分布特征。与非有效储层相比，有效储层中压实作用和胶结作用的减孔率显著降低，而溶蚀增孔率显著增加。中生界有效储层的发育受多因素控制，刚性颗粒含量高、分选好的砂岩抗压实能力强，是有效储层形成的物质基础，而早期成因的碳酸盐胶结物具有“减压保孔”的作用；相对开放的水-岩体系有利于溶蚀反应的进行，并抑制了中期方解石胶结；淋滤溶蚀和有机酸溶蚀作用改善了储层的宏观储集物性和微观孔隙结构，是有效储层发育过程中的关键成岩改造作用；断层活动产生的微裂缝会提高储层渗流能力，是控制中生界油气分布的重要因素。

关键词: 淋滤溶蚀, 水-岩体系, 胶结作用, 有效储层, 白垩系, 侏罗系, 高青地区, 渤海湾盆地

Abstract: The Mesozoic effective reservoirs in Gaoqing Region,Dongying Depression show strong heterogeneity and complex diagenetic evolution.In order to gain insight into the petrological characteristics and physical properties of the effective Mesozoic reservoirs and clearly demonstrate the controlling factors for the growth of effective reservoirs,tests including the thin section,scanning electron microscope(SEM),cathodoluminescence,high pressure mercury intrusion and fluid inclusion were performed,and a comparative study on pore structure and diagenesis characteristics between effective and non-effective reservoirs was carried out.Results indicate that,the Mesozoic effective reservoirs in Gaoqing Region are characterized by well-developed secondary pores,relatively good physical properties and strong heterogeneity of pore structure with a bimodal distribution of mesopore throats and micropore throats.Compared with non-effective reservoirs,the porosity reduction rate in effective reservoirs significantly decreases due to compaction and cementation,while the porosity enlargement rate with dissolution increases largely.The development of Mesozoic effective reservoirs in Gaoqing Region is controlled by multiple factors.Well-sorted sandstones with high content of rigid particles weaken the porosity reduction owing to compaction,and help compose the material basis of effective reservoirs.Early carbonate cements in effective reservoirs have the ability of "anti-compaction and pore-preserving".The relatively open water-rock system is favorable for dissolution,and inhibits the mid-stage calcite cementation.The leaching dissolution and organic acid dissolution,the dominant mechanisms for diagenetic modification,function to effectively improve the macroscopic reservoir quality and microscopic pore structures.The micro-fractures generated by faulting can improve the seepage capacity of effective reservoirs,and profoundly control the distribution of oil and gas in the Mesozoic.

Key words: leaching dissolution, water-rock system, cementation, effective reservoir, Cretaceous, Jurassic, Gaoqing Region, Bohai Bay Basin

中图分类号:

TE122

王亚,杨少春,路研,等. 渤海湾盆地东营凹陷高青地区中生界低渗透碎屑岩有效储层特征及发育控制因素[J]. 石油与天然气地质, 2019, 40(2): 271-283. doi: 10.11743/ogg20190206 Wang Ya,Yang Shaochun,Lu Yan,et al. Characteristics and controlling factors of effective reservoirs of Mesozoic low-permeability clastic rocks in Gaoqing Region,Dongying Depression, Bohai Bay Basin,China[J]. Oil & Gas Geology, 2019, 40(2): 271-283. doi: 10.11743/ogg20190206

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渤海湾盆地东营凹陷高青地区中生界低渗透碎屑岩有效储层特征及发育控制因素

Characteristics and controlling factors of effective reservoirs of Mesozoic low-permeability clastic rocks in Gaoqing Region,Dongying Depression, Bohai Bay Basin,China

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