辫状河储层构型单元解剖及有效砂体分布规律

收稿日期：20160707；改回日期：20161114

基金项目：国家科技重大专项

“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（2016ZX05050）作者简介：张吉（1974—），男，高级工程师，1998年毕业于西南石油学院油气田开发专业，2004年毕业于该校油气田开发工程专业，获博士学位，现从事苏

里格气田天然气开发与地质研究工作。

DOI ：10.3969/j.issn.1006－6535.2017.02.001

辫状河储层构型单元解剖及有效砂体分布规律

张

吉1，2，马志欣1，2，王文胜1，2，孙艳辉1，2，付

斌

1，2

（1.中国石油长庆油田分公司，陕西西安710018；2.低渗透油气田勘探开发国家工程实验室，陕西

西安

710018）

摘要：苏里格气田盒8下亚段（H 8x ）辫状河储层砂体连续性和连通性差，非均质性强，为了更高效地进行气田开发，应用储层构型理论，以试验区苏ˑˑ井为例，开展地下辫状河辫状水道、心滩识别及内部结构精细解剖，

明确有效砂体分布规律。研究表明：心滩含气性明显好于辫状水道，辫状水道和心滩内部结构、局部岩性、物性差异共同控制有效砂体分布；辫状水道有效砂体主要位于下部粗粒沉积内；心滩迎流面除夹层外，均为有效砂体，心滩核部整体以有效砂体为主，非有效砂体局部分布，心滩背流面整体含气性最差，有效砂体主要分布在粒度较粗的中下部。心滩迎流面、核部及辫状水道下部应作为苏里格气田下一步精细开发的主要目的砂体。研究成果为苏里格气田水平井优化设计和气田高效开发提供精细的地质依据。关键词：储层构型；有效砂体；地下辫状河储层；盒8下亚段；苏里格气田中图分类号：TE122.2

文献标识码：A

文章编号：1006－6535（2017）02－0001－05

Dissection of Structural Units of Braided Ｒiver Ｒeservoirs and Distribution of Effective Sandstone Formations

Zhang Ji 1，2，Ma Zhixin 1，2，Wang Wensheng 1，2，Sun Yanhui 1，2，Fu Bin 1，2（1．PetroChina Changqing Oilfield Company ，Xi ’an ，Shanxi 710018，China ；

2．Low －permeability Oil ＆Gas Exploration and Development of National Engineering Laboratory ，Xi ’an ，Shanxi 710018，China ）

Abstract ：Sandstone formations in braided river reservoir of H 8x in the Sulige Gasfield are characterized by poor continuity and connectivity ，and high heterogeneity．To enhance efficiency of gasfield development ，reservoir archi-tecture theories have been used in the Well Su ˑˑwithin the study area to identify underground braided channel and diara ，and to determine their internal structures accurately．Eventually ，patterns for distribution of effective sand-stone formations can be determined．Ｒesearch results show diaras have gas －bearing properties significantly better than those of braided channels．On the other hand ，internal structures ，regional lithologic features and different physical properties of braided channel and diara may jointly control distribution of effective sandstone formations ；Effective sandstone formations in braided channels distributed predominantly in rough －sized sediments in lower parts ；Except interlayers ，

surfaces toward flows in diara conatin effective sandstone formation．Core sections of diara are dominated by effective sandstone formations ，with non －effective sandstone formation distributed regionally．Sur-faces opposite to flow in the diara have poor gas －bearing properties in general with effective sandstone formations distributed in middle and lower parts with rough particles．Generally speaking ，

surface against flows ，cores and low-er parts of braided channel in the diara shall be considered as major target sandstone formations for fine development in the Sulige Gasfield in future．Ｒelevant researches may provide reliable geologic foundations for horizontal well op-timization design and for high －efficiency development of the Sulige Gasfield．

Key words ：reservoir architecture ；effective sandstone formation ；underground braided river reservoir ；H 8x ；Sulige Gasfield