应用新型产能模拟法确定气藏动态渗透率下限——以四川盆地安岳气田灯影组四段台内储层为例  

Determining dynamic cutoff of gas reservoir permeability by novel productivity simulation method:A case study of intra⁃platform reservoir of 4th Member in Dengying Formation of Anyue gas field in Sichuan Basin

作　　者：胡江涛 杨胜来[1,2] 毕露霏 闫海军 邓惠[4,5] 王梦雨 李佳峻 李沛耘 刘新月 田乐娆 HU Jiangtao;YANG Shenglai;BI Lufei;YAN Haijun;DENG Hui;WANG Mengyu;LI Jiajun;LI Peiyun;LIU Xinyue;TIAN Lerao(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;National Key Laboratory of Petroleum Resources and Engineering,Beijing 102249,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Exploration and Development Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu 610041,China;PetroChina Sichuan Petroleum Administration Co.,Ltd.,Chengdu 610051,China;Shale Gas Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu 610056,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]油气资源与工程全国重点实验室,北京102249 [3]中国石油勘探开发研究院,北京100083 [4]中国石油西南油气田公司勘探开发研究院,四川成都610041 [5]中国石油四川石油管理局有限公司,四川成都610051 [6]中国石油西南油气田公司页岩气研究院,四川成都610056

出　　处：《大庆石油地质与开发》2025年第2期99-109,共11页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司“十四五”前瞻性基础性科技项目“风化壳型碳酸盐岩气藏提高采收率技术研究”(2021DJ1504);四川省自然科学基金项目“超高压特低孔强非均质碳酸盐岩气藏有效储层物性下限研究”(2023NSFSC0261)。

摘　　要：准确确定储层物性下限是四川盆地安岳气田灯影组台内碳酸盐岩气藏实现储量准确评估和规模效益开发的重点工作,然而由于该区块目前的岩心分析资料和生产测试资料较少,利用传统物性下限确定方法不能准确地评估出该区块储层物性下限。为此,建立了综合考虑应力敏感性、滑脱效应、阈值压力梯度、气体黏度和压缩因子变化的新型产能模拟法,同时开展了阈值压力梯度、应力敏感系数和滑脱因子测定实验以及原始储层温度和压力条件下的岩心产能模拟实验,最后利用产量转化准则将岩心流量转化为气井产量,得到了不同边界压力和不同生产压差下的储层渗透率下限。新型产能模拟法计算结果表明:气藏储层的渗透率下限在不同的开发阶段是动态变化的;随着气藏边界压力的下降,储层的渗透率下限不断升高;以储层有效厚度为36m,气井生产压差为6MPa为例,评价出安岳气田灯影组四段台内储层经济效益开发的渗透率下限为0.05×10^(-3)µm^(2),对于台内区的可动储量评估及后续选区布井开发具有重要指导意义。Accurate determination of reservoir property cutoff is a key task in realizing precise reserves assessment and scale-beneficial development of intra-platform carbonate gas reservoirs in Dengying Formation of Anyue gas field in Sichuan Basin.However,the lack of core analysis data and production test data in this block hinders accu-rate assessment of reservoir property cutoff by traditional methods.Therefore,a novel productivity simulation meth-od is established,comprehensively considering stress sensitivity,slippage effect,threshold pressure gradient,gas viscosity and compressibility factor variation.Simultaneously,experiment to determine threshold pressure gradient,stress sensitivity coefficient and slippage factor is performed,as well as core productivity simulation experiment at original reservoir temperature and pressure.Finally,core flow rate is converted to gas well production using produc-tion conversion criteria to obtain reservoir permeability cutoff at different boundary pressures and different produc-tion pressure differences.Calculation results of novel productivity simulation method show that gas reservoir permea-bility cutoff varies dynamically in different development stages,continuously increasing with boundary pressure of gas reservoir decrease.Taking net pay thickness of 36 m and gas well production pressure difference of 6 MPa as an example,the permeability cutoff for economically beneficial development of intra-platform reservoir in 4th Member of Dengying Formation in Anyue gas field is evaluated to be 0.05×10^(-3)µm^(2),providing guiding significance for as-sessment of producing reserves in intra-platform area and subsequent area selection for wells deployment.

关 键 词：深层碳酸盐岩气藏 安岳气田 灯影组 台内区 产能模拟法 储层物性下限 

分 类 号：TE357[石油与天然气工程—油气田开发工程]