平落坝须二段气藏孔隙-裂缝型储层建模及数模技术  

Modeling and numerical simulation for porous-fractured gas reservoirs of Xujiahe 2 Member,Pingluoba region,Sichuan Basin

作　　者：裴森奇[1,2] 胡欣 邓波[1] 李旭成[1] 郭静姝[3] 张清秀[3] 龙虹宇[1] 周光亮 邓清源[1] 李琦 Pei Senqi;Hu Xin;Deng Bo;Li Xucheng;Guo Jingshu;Zhang Qingxiu;Long Hongyu;Zhou Guangliang;Deng Qingyuan;Li Qi(Northwestern Sichuan Gas District,PetroChina Southwest Oil&Gasfield Company,Jiangyou,Sichuan 621700,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China)

机构地区：[1]中国石油西南油气田公司川西北气矿 [2]西南石油大学地球科学与技术学院 [3]中国石油西南油气田公司勘探开发研究院

出　　处：《天然气勘探与开发》2020年第4期77-84,共8页Natural Gas Exploration and Development

摘　　要：平落坝须二段气藏孔隙裂缝型储层非均质性强、气藏水侵复杂、剩余储量动用困难。为进一步提高气藏开发效果,利用岩心薄片鉴定、成像测井及叠前裂缝预测,分析了气藏裂缝发育特征。针对孔隙裂缝型储层建模难点,利用随机裂缝建模的方法,在裂缝强度模型的约束下,对各裂缝集进行模拟,并对裂缝集进行粗化得到裂缝属性模型,得到最终裂缝模型。在建立模型的基础上,进行气水三维两相单孔双渗双重介质黑油模型的气藏数值模拟。研究表明:①平落坝须二段有效储层微裂缝的开度常在2~20μm之间、平均中值喉道半径为0.02~0.311μm;②裂缝分布受断层影响较为明显,数值模拟储量85.6×108 m3,目前剩余储量主要分布于Ⅱ和Ⅲ气层组;③通过定性与定量结合评价剩余储量分布特征,详细分析剩余气富集区新井部署风险,为下步挖潜技术对策制定奠定良好基础。Most porous-fractured gas reservoirs of Xujiahe 2 Member in Pingluoba region are characterized by strong heterogeneity,complex water invasion,and difficult production of remaining gas reserves.In order to further improve their development effect,some characteristics of fracture development in these gas reservoirs were analyzed by using thin-section identification,imaging well logging,and pre-stack fracture prediction.In view of certain difficulties in modeling porous-fractured reservoirs,a method of stochastic fracture modeling was used and constrained by the fracture strength model.Each fracture set was modelled,and the fracture sets were coarsened to get one fracture attribute model,at last the final fracture model was gained.On the basis of this final model,numerical simulation was carried out for the gas-water three-dimensional two-phase single-porosity and double-permeability dual-medium black oil model.Results show that(1)for microfractures developed in effective Xujiahe 2 reservoirs in Pingluoba region,their opening is generally in the range of 2-20μm,and 0.02-0.311μm for the average median throat radius,respectively;(2)fracture distribution is obviously affected by faults.According to numerical simulation,the reserves of Xujiahe 2 gas reservoirs are 85.6×108 m3,and the current remaining reserves are mainly distributed in II and III gas layers;and(3)through qualitative and quantitative analysis,the distribution characteristics of the remaining reserves are evaluated,and the risk of new well deployment in the remaining gas-accumulating areas is analyzed in detail,which lays a good foundation for making technical countermeasures for further tapping potential.

关 键 词：四川盆地 须二段 平落坝地区 致密砂岩气藏 地质建模 气藏数值模拟 剩余储量预测 

分 类 号：TE37[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学] P628[天文地球—地质学]