子洲气田本溪组-盒8段储层孔隙结构特征、成因及其对储量动用的影响  

Pore Structure Characteristics,Genesis and Influence on Reserve Utilization of Benxi-He 8 Formation in Zizhou Gas Field

作　　者：代金友[1] 巩肖可 陈代欣 蒋婷婷[2] 雷小兰[2] 赵世佳 DAI Jin-you;GONG Xiao-ke;CHEN Dai-xin;JIANG Ting-ting;LEI Xiao-lan;ZHAO Shi-jia(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;The Second Gas Production Plant of PetroChina Changqing Oilfield Company,Yulin 719000,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油长庆油田分公司第二采气厂,榆林719000

出　　处：《科学技术与工程》2025年第7期2776-2783,共8页Science Technology and Engineering

基　　金：国家科技重大专项-油气重大专项(2016ZX05047-005);国家科技重大专项(2017ZX05035004)。

摘　　要：子洲气田是一个多层叠合致密砂岩气田,储层涵盖了石炭系本溪组-二叠系下石盒子组盒8段。目前,该套储层孔隙结构及其对储量动用影响尚缺乏整体规律性认识,严重制约了气田层间挖潜进程。利用铸体薄片、储层物性和生产资料,采用统计和相关性分析法,对本溪组-盒8段储层孔隙结构特征、成因及其对储量动用影响进行系统研究,给出了气田后续层间挖潜建议。结果表明:(1)该套储层具有典型的1+1型孔隙结构。其中,下部层组(本溪组、太原组、山2段)原生粒间孔发育,原生孔隙比例、面孔率和孔径较大,孔隙结构好,为原生孔隙主导型孔隙结构;上部层组(山1段、盒8下、盒8上)次生粒内溶孔-晶间孔-微裂隙发育,原生孔隙比例、面孔率和孔径较较小,孔隙结构差,为次生孔隙主导型孔隙结构。(2)储层岩石成分,尤其是石英和岩屑含量差异是1+1型孔隙结构形成的主要原因。其中,下部层组以石英砂岩为主,石英含量高、岩屑含量低,有利于原生孔隙保存;而上部层组以岩屑砂岩为主,岩屑含量高、石英含量低,不利于原生孔隙保存,而有利于次生孔隙形成。(3)1+1型孔隙结构对储量动用具有显著影响。其中,下部层组孔隙结构好,储层相对高渗(0.52 mD)、大泄流面积(0.70 km^(2))、高储量动用程度(67.9%);而上部层组孔隙结构差,储层相对低渗(0.33 mD)、小泄流面积(0.34 km^(2))、低储量动用程度(26.9%)。(4)分析认为,目前井网条件下,上部层组储量未得到有效动用。为实现气田均衡开采和提高气田整体储量动用,建议对上部层组以小井距单独开采。Zizhou gas field is a multi-layer superposed tight sandstone gas field.The reservoir covers strata from Benxi Formation of Carboniferous system to He8 Formation of lower Shihezi Formation of Permian system.At present,the pore structure of the reservoir and its influence on the reserve utilization are not well understood.It seriously restricts the gas field interlayer digging process.The pore structure of tight sandstone reservoirs in Benxi Formation-He8 Member was comprehensively investigated through the utilization of cast thin sections,reservoir physical property,production data,as well as statistical and correlation analysis methods.The suggestions for further interlayer potential exploitation were also given.Draw four conclusions.The reservoir has a typical 1+1 type pore structure.Among them,the lower formations(Benxi Formation,Taiyuan Formation,Shan2 member)have developed primary intergranular pores,with large primary pore proportion,face rate and pore size,and good pore structure,which is the dominant pore structure of primary pores.In the upper formations(Shan1 member and He8 member),the intragranular dissolve pore-intercrystalline pore-microfissure are developed,the primary pore ratio,face ratio and pore size are smaller,and the pore structure is poor,which is the dominant pore structure of the secondary pores.The difference of rock composition,especially the content of quartz and cuttings,is the main reason for the formation of 1+1 pore structure.Among them,the lower formations are dominated by quartz sandstone with high quartz content and low cuttings content,which is conducive to the preservation of primary pores.The upper formations are dominated by lithic sandstone with high lithic content and low quartz content,which are not conducive to the preservation of primary pores but to the formation of secondary pores.The pore structure of 1+1 type has a significant effect on the exploitation of reserves.Among them,the lower formations have good pore structure,relatively high permeability(0.52 mD),large dis

关 键 词：鄂尔多斯盆地 子洲气田 致密砂岩储层 孔隙结构 储量动用 

分 类 号：TE328[石油与天然气工程—油气田开发工程]