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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第41卷

期数:

2019年第06期

页码:

707-720

栏目:

基础地质与矿产地质

出版日期:

2019-11-15

文章信息/Info

Title:

Controlling Factors on Physical Properties of Cretaceous Nahr Umr Formation Sandstone Reservoir in Halfaya Oilfield, Iraq

文章编号:

1672-6561(2019)06-0707-14

作者:

吕洲¹; 王玉普²; 王友净¹; 代寒松³; 朱光亚¹; 穆朗枫⁴; 5

(1. 中国石油勘探开发研究院,北京 100083; 2. 中国工程院,北京 100088; 3. 中国石油勘探开发研究院西北分院,甘肃 兰州 730020; 4. 北京大学 地球与空间科学学院,北京 100871; 5. 中国地质科学院,北京 100037)

Author(s):

LU Zhou¹;  WANG Yu-pu²;  WANG You-jing¹;  DAI Han-song³;  ZHU Guang-ya¹;  MU Lang-feng⁴; 5

(1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China; 2. Chinese Academy of Engineering, Beijing 100088, China; 3. Northwest Branch of Research Institute of Petroleum Exploration and Development, PetroChina, Lanzhou 730020, Gansu, China; 4. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 5. Chinese Academy of Geological Sciences, Beijing 100037, China)

关键词:

砂岩储层;  物性;  控制因素;  潮控三角洲;  Nahr Umr组;  白垩系;  哈法亚油田;  伊拉克

Keywords:

sandstone reservoir;  physical property;  controlling factor;  tidal-controlled delta;  Nahr Umr Formation;  Cretaceous;  Halfaya oilfield;  Iraq

分类号:

P618.13

DOI:

-

文献标志码:

A

摘要:

利用岩芯观察和铸体薄片鉴定,结合物性、扫描电镜、X-射线衍射分析、压汞实验等,探讨了伊拉克哈法亚油田白垩系Nahr Umr组砂岩储层物性特征及其控制因素。结果表明:哈法亚油田白垩系Nahr Umr组B段潮控三角洲相砂岩储层整体呈中孔中渗的物性特征,孔隙类型以粒间孔和溶蚀孔为主,孔喉变化较大,非均质性强; 储层物性的控制因素包括沉积作用和成岩作用,沉积作用影响着孔隙空间类型和孔隙结构,物性较好储层发育在水动力条件较强且岩石组分结构特征较好的储层中,成岩作用对储层物性起到了显著的改造作用,压实作用和胶结作用造成了孔隙大量充填,自生矿物和黏土矿物不仅减小了孔隙空间,并造成孔喉堵塞,物性变差,而溶蚀作用产生的次生孔隙改善了储层物性; 最优质的储层发育在潮控分流河道相交错层理砂岩中,这类储层具有粒度大、分选好、石英相对含量高、黏土矿物含量低、胶结物含量低、孔隙发育、孔喉半径大的特点,对应的储层物性为中高孔高渗,是研究区储层表征与建模的重点。

Abstract:

The core observation and casting thin section authentication, combined with physical properties, scanning electron microscope, X-ray diffraction and mercury intrusion experiment, were employed to characterize the controlling factors on physical properties of Cretaceous Nahr Umr Formation sandstone reservoir in Halfaya oilfield, Iraq. The results show that the tide-controlled deltaic sandstone reservoir of core B of Nahr Umr Formation in Halfaya oilfield has medium porosity and permeability, and the reservoir space includes intergranular pore and dissolved pore; the pore throat changes greatly and the heterogeneity is strong; the controlling factors of reservoir physical properties include sedimentation and diagenesis; sedimentation affects pore space type and pore structure; reservoirs with good physical properties are developed with strong hydrodynamic conditions and good rock composition; diagenesis plays a significant role on the physical properties of reservoir; the compaction and cementation cause a large amount of pore filling, and the authigenic and clay minerals not only reduce the pore space, but also cause blockage of the throat, resulting in plugging of the pore throat and deterioration of the physical properties; the secondary pores produced by dissolution improve the reservoir physical properties; the highest-quality reservoir develops at the cross-laminated sandstone in tide-controlled distributary channel facies, and has the characteristics of large grain size, well sorting, relatively high content of quartz, low contents of clay mineral and cement, and large size of pore throat; the corresponding porosity and permeability are medium-high and high respectively, which are the focus of characterization and modeling of reservoir in the research area.

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备注/Memo

备注/Memo:

收稿日期:2019-04-29; 修回日期:2019-06-30投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家科技重大专项项目(2017ZX05030-001); 中国石油集团公司“十三五”海外开发业务发展方向项目(2019D-4410)
作者简介:吕 洲(1990-),男,陕西西安人,工程师,工学博士,E-mail:lvzhou827@163.com。

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更新日期/Last Update: 2019-11-19