Formation mechanism of dolomite reservoir in the Lower Cretaceous Q amchuqa Formation,Zagros Basin

doi:10.7623/syxb2016S1012

Acta Petrolei Sinica ›› 2016, Vol. 37 ›› Issue (S1): 121-130.DOI: 10.7623/syxb2016S1012

• Petroleum Exploration • Previous Articles Next Articles

Formation mechanism of dolomite reservoir in the Lower Cretaceous Q amchuqa Formation,Zagros Basin

Zhang Demin¹, Duan Taizhong¹, Hao Yan², Zhang Tao¹, Zhong Xiangyun³

1. Sinopec Exploration & Production Research Institute, Beijing 100083, China;
2. Sinopec International Petroleum Exploration and Production Corporation, Beijing 100029, China;
3. Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China

Received:2016-03-15 Revised:2016-09-02 Online:2016-10-31 Published:2016-11-30

扎格罗斯盆地下白垩统Qamchuqa组白云岩储层形成机理

张德民¹, 段太忠¹, 郝雁², 张涛¹, 仲向云³

1. 中国石油化工股份有限公司石油勘探开发研究院北京 100083;
2. 中国石化集团国际石油勘探开发有限公司北京 100029;
3. 中国石油长庆油田公司勘探开发研究院陕西西安 710018

通讯作者: 张德民,男,1983年1月生,2007年获成都理工大学学士学位,2014年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院博士后,主要从事碳酸盐岩沉积及储层地质研究工作。Email:zhangdm.syky@sinopec.com
作者简介:张德民,男,1983年1月生,2007年获成都理工大学学士学位,2014年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院博士后,主要从事碳酸盐岩沉积及储层地质研究工作。Email:zhangdm.syky@sinopec.com
基金资助:
国家重大科技专项（2011ZX05031-002）和中国博士后科学基金项目（2016M591352）资助。

Abstract

Abstract:

The Lower Cretaceous Qamchuqa Formation in Zagros Basin has great potential of oil and gas resources. The rock type, reservoir space type, reservoir physical property and other characteristics were systematically analyzed comprehensively using field section, core, thin section, cuttings thin section, scanning electron microscope, physical property testing, logging data, and etc.. Combined with the research results of sedimentary facies belt, diagenesis, and tectonism, etc., the formation mechanism of reservoir was also discussed. Research shows that the reservoir rock is dominated by various types of dolomite; the top of the 1st member of Qamchuqa Formation and solution pores in the 6th member of Qamchuqa Formation are the main reservoir space; crystal dolomite in the 6th member of Qamchuqa Formation has the best physical property. The original sedimentary facies belt has an obvious control effect on reservoir quality, which is specifically expressed as the best reservoir quality of grain beach facies reservoir in the inner ramp (the 6th member of Qamchuqa Formation) and the worst reservoir quality in the middle ramp (the lower sub-member of the 5th member of Qamchuqa Formation); dissolution and dolomitization are main constructive diagenesises; structure fractures can significantly improve permeability. Finally, the formation mechanisms of para-syngenetic dolomite reservoir (the 1st member of Qamchuqa Formation-the 3rd member of Qamchuqa Formation) and grain beach reservoir (the 6th member of Qamchuqa Formation) were established.

Key words: formation mechanism, para-syngenetic dolomite reservoir, grain beach reservoir, Qamchuqa Formation, Zagros Basin

摘要：

扎格罗斯盆地下白垩统Qamchuqa组油气资源潜力巨大。综合利用野外剖面、岩心、普通薄片、岩屑薄片、扫描电镜、物性测试、测井等资料，系统分析了储层岩石类型、储集空间类型、储层物性等特征。结合沉积相带、成岩作用、构造作用等研究成果，探讨了储层形成机理。研究表明：各类白云岩是研究区主要储层岩石类型；Qamchuqa组一段顶部以及Qamchuqa组六段内部溶蚀孔洞是主要储集空间；Qamchuqa组六段中晶白云岩物性最好。原始沉积相带对储层质量控制作用明显，具体表现为内缓坡颗粒滩相（Qamchuqa组六段）储层最好，中缓坡（Qamchuqa组五段下亚段）储层最差；溶蚀作用和白云石化作用是主要建设性成岩作用；构造裂缝可显著改善渗透率。最终建立了准同生白云岩型（Qamchuqa组一段-Qamchuqa组三段）储层和颗粒滩型（Qamchuqa组六段）储层形成机理。

关键词: 形成机理, 准同生白云岩型储层, 颗粒滩型储层, Qamchuqa组, 扎格罗斯盆地

CLC Number:

TE122

Zhang Demin, Duan Taizhong, Hao Yan, Zhang Tao, Zhong Xiangyun. Formation mechanism of dolomite reservoir in the Lower Cretaceous Q amchuqa Formation,Zagros Basin[J]. Acta Petrolei Sinica, 2016, 37(S1): 121-130.

张德民, 段太忠, 郝雁, 张涛, 仲向云. 扎格罗斯盆地下白垩统Qamchuqa组白云岩储层形成机理[J]. 石油学报, 2016, 37(S1): 121-130.

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Formation mechanism of dolomite reservoir in the Lower Cretaceous Q amchuqa Formation,Zagros Basin

扎格罗斯盆地下白垩统Qamchuqa组白云岩储层形成机理

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