苏里格气田中部盒8下段致密砂岩储层“四性”特征分析与研究——以苏6区块为例  

Four Characteristics of Tight Sandstone Reservoirs in the Lower Section of He 8 in the Central Sulige Gas Field——Taking Su 6 Block as an Example

作　　者：沈涛 屈乐 何瑞军 黄佳希 SHEN Tao;QU Le;HE Rui-jun;HUANG Jia-xi(School of Earth Sciences and Engineering;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,China;School of petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]西安石油大学石油工程学院,陕西西安710065

出　　处：《榆林学院学报》2025年第2期12-17,共6页Journal of Yulin University

基　　金：国家自然科学基金面上项目(52074226);陕西省创新能力支撑计划(2022PT-08);陕西省重点研发计划(2021KW-10)。

摘　　要：苏里格气田是我国最大的致密气生产基地,但由于致密砂岩储层低渗、低孔、低压和强非均质性的特征,严重制约了储层的高效勘探和开发。致密砂岩储层“四性”特征分析是该类储层研究的基础,也是评价储层含气性的关键。以苏6区块的主力产层盒8下段致密砂岩储层为研究对象,以试气数据资料和岩屑观察资料为依据,基于储层的“四性”关系分析,掌握“四性”之间的内在联系,进一步建立储层孔渗模型,初步提出划分储层气层识别的标准。研究结果表明,苏6区块盒8下段储层的矿物组成以石英为主,具有低孔低渗的特征,是典型的致密砂岩储层,其气层的孔隙度下限一般为6.05%,渗透率下限为0.3 mD,气层普遍聚集于声波时差大于等于215.64μm/s,密度值小于等于2.53 g/cm^(3)的区间内。研究区异常特殊的孔渗结构,可能是“横向砂体频繁迁移,纵向砂体多套叠置”的沉积特征所致,成岩作用机制的多样化,也提高了储层的复杂程度,这些可能是造成研究区气井低产的部分影响因素。Sulige gas field is the largest tight gas production base in China,but due to the low permeability,low porosity,low pressure,and strong heterogeneity of tight sandstone reservoirs,it severely restricts the efficient exploration and development of the reservoirs.The analysis of the four characteristics(lithology,electrical properties,physical properties,hydrocarbon content)of tight sandstone reservoirs is the foundation of research on this type of reservoir and the key to evaluating the gas bearing properties of the reservoir.This article takes the tight sandstone reservoir in the lower section of He 8,the main production layer of Su 6 block,as the research object.Based on gas testing data and rock debris observation data,based on the analysis of the four characteristics of the reservoir,the internal relationship between the four characteristics is grasped,and reservoir porosity and permeability model are further established.The standard for identifying the gas layer in the reservoir is preliminarily proposed.The research results indicate that the mineral composition of the lower reservoir of He 8 in Su 6 block is mainly quartz,with low porosity and low permeability characteristics,making it a typical tight sandstone reservoir.The lower limit of the porosity of the gas layer is generally 6.05%,and the lower limit of the permeability is 0.3 mD.The gas layer is generally concentrated in the range of acoustic time difference greater than or equal to 215.64μm/s and density value less than or equal to 2.53 g/cm^(3).The abnormally unique pore permeability structure in the study area may be due to the sedimentary characteristics of frequent migration of horizontal sand bodies and multiple sets of overlapping vertical sand bodies.The diversification of diagenetic mechanisms also increases the complexity of reservoir,which may be some of the influencing factors causing low production of gas wells in the study area.

关 键 词：苏里格气田 致密砂岩储层 盒8下段 “四性”特征 

分 类 号：P618.13[天文地球—矿床学]