鄂尔多斯盆地华庆地区长8致密砂岩储层特征及其成因

doi:10.11743/ogg20130515

石油与天然气地质 ›› 2013, Vol. 34 ›› Issue (5): 679-684.doi: 10.11743/ogg20130515

鄂尔多斯盆地华庆地区长8致密砂岩储层特征及其成因

张纪智¹, 陈世加¹, 肖艳², 路俊刚¹, 杨国平³, 唐海评¹, 刘超威¹

1. 西南石油大学, 四川成都 610500;
2. 四川省煤田地质工程勘察设计研究院, 四川成都 610500;
3. 中国石油长庆油田分公司, 陕西西安 710000

收稿日期:2012-07-30 修回日期:2013-08-26 出版日期:2013-10-08 发布日期:2013-10-08
第一作者简介:张纪智(1988—),男,博士研究生,矿场普查与勘探。E-mail:171205447@qq.com。

Characteristics of the Chang 8 tight sandstone reservoirs and their genesis in Huaqing area,Ordos Basin

Zhang Jizhi¹, Chen Shijia¹, Xiao Yan², Lu Jungang¹, Yang Guping³, Tang Haiping¹, Liu Chaowei¹

1. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Engineering Investigation and Design Institute of Sichuan Provincial Coalfield Bureau, Chengdu, Sichuan 610500, China;
3. Chang qing Oil Field Company, PetroChina, Xi'an, Shaanxi 710000, China

Received:2012-07-30 Revised:2013-08-26 Online:2013-10-08 Published:2013-10-08

摘要/Abstract

摘要：

鄂尔多斯盆地华庆地区长8段砂岩为一套典型的低孔、低渗到特低孔、特低渗的储层,平均孔隙度为8.27%,平均渗透率为0.51×10^-3 μm²,主要孔隙类型为剩余粒间孔隙,孔隙结构以小型小孔喉和微型小孔喉为主。长8致密砂岩储层经历了压实、胶结、溶解等复杂的成岩作用,其中压实和胶结等破坏性成岩作用使储层的原生孔隙大大减少,且长8储层在镜下发现沥青充填孔隙,降低了储层的物性,导致储层致密。成岩作用对储层的致密化起决定性作用,沉积环境是控制致密砂岩储层形成的基本因素,三角洲前缘砂体中的水下分流河道砂体物性最好;主砂体展布带内中心部位物性好,向两边逐渐变差。随着填隙物含量的增加,储层物性逐渐变差。

关键词: 储层沥青, 填隙物, 矿物组分, 成岩作用, 沉积作用, 致密砂岩, 鄂尔多斯盆地

Abstract:

Chang 8 sandstone of the Upper Triassic Yanchang Formation in Huaqing area,Ordos Basin,is a typical set of reservoirs with low-ultra low porosity and permeability.Its average porosity is 8.27% and average permeability is 0.51×10^-3 μm².The main type of pore space is residual inter-granular pore,and the main type of pore structure is tiny and micro throat.The Chang 8 reservoir has experienced complex diagenesis,such as compaction,cementation,and dissolution.The destructive diagenesis of compaction and cementation sharply reduce the primary pores of the reservoir,besides,some pores are filled with bitumen,resulting in the lowering of porosity and permeability and the tightness of the reservoir.Diagenis is a determining factor in reservoir tightening,while depositional environment is the basic controlling factor of the reservoir physical property.The underwater distributary channel sands in delta front have the best physical property,and the central part of the sandbody is better than its two sides.With the increasing of interstilital matter,the physical properties get poorer.

Key words: reservoir bitumen, interstitial matter, mineralogical composition, diagenesis, sedimentation, tight sandstone, Ordos Basin

中图分类号:

TE122.2

张纪智,陈世加,肖艳,等. 鄂尔多斯盆地华庆地区长8致密砂岩储层特征及其成因[J]. 石油与天然气地质, 2013, 34(5): 679-684. doi: 10.11743/ogg20130515 Zhang Jizhi,Chen Shijia,Xiao Yan,et al. Characteristics of the Chang 8 tight sandstone reservoirs and their genesis in Huaqing area,Ordos Basin[J]. Oil & Gas Geology, 2013, 34(5): 679-684. doi: 10.11743/ogg20130515

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鄂尔多斯盆地华庆地区长8致密砂岩储层特征及其成因

Characteristics of the Chang 8 tight sandstone reservoirs and their genesis in Huaqing area,Ordos Basin

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