四川盆地铁山坡飞仙关组膏盐层控气非均质性三维表征  

Three-dimensional characterization of natural gas heterogeneity controlled by gypsum-salt layer in the Feixianguan Formation in the Tieshanpo area,Sichuan Basin

作　　者：彭先[1] 欧成华 肖富润[2] 王蓓 郭培培[2] 和宇博 彭仕轩 刘俊延 PENG Xian;OU Chenghua;XIAO Furun;WANG Bei;GUO Peipei;HE Yubo;PENG Shixuan;LIU Junyan(Research Institute of Exploration and Development PetroChina Southwest Oil and Gasfield Company,Chengdu 610041,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Development Division of PetroChina Southwest Oil&Gasfield Company,Chengdu 610500,China)

机构地区：[1]中国石油天然气股份有限公司西南油气田分公司勘探开发研究院,成都610041 [2]西南石油大学石油与天然气工程学院,成都610500 [3]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500 [4]中国石油天然气股份有限公司西南油气田分公司,成都610500

出　　处：《地质科技通报》2025年第2期193-203,共11页Bulletin of Geological Science and Technology

基　　金：四川科教联合基金重点项目(2024NSFSC1960);油气勘探开发国家科技重大专项(2024ZD14049-004)。

摘　　要：膏岩层控气是重要的天然气富集成藏模式,现有膏岩层控气研究集中于实验测试与定性描述,缺乏对膏盐层分布的三维表征。为此,研发了膏盐层与气水层井震结合相控三维建模新技术,具体包括膏盐层测井解释及相控三维建模、膏盐层地震遗传反演三维建模、膏盐层井震结合三维建模、沉积微相控制的气水层三维建模及膏盐层与气水层三维融合建模5个关键技术环节,应用于分析四川盆地铁山坡飞仙关组膏盐层的控气性,建立了膏盐层与气水层井震结合相控三维模型,定量刻画了研究区内膏盐层的控气非均质性,实现了对膏盐层控气的三维可视化定量表征。结果表明:铁山坡飞仙关组膏盐层平面上除Ⅰ区和Ⅱ区中部局部范围外,其余大部分区域呈连续片状分布,纵向上具有多层、薄层、厚度强非均质分布等特征;呈现出封盖控气性、降储控气性和使气藏复杂化3类控气特征模式,显示了研究区膏盐层控气的强非均质性。研究成果为研究区天然气非均衡规模高效开发提供了可靠的模型基础与地质认识。[Objective]Natural gas heterogeneity controlled by gypsum-salt layers is a significant model for enrichment and accumulation.While previous studies have primarily focused on experimental testing and qualitative descriptions,they have lacked three-dimensional characterization of the gypsum-salt layers distribution.This study proposes a novel three-dimensional modeling technique that integrates well-seismic data with sedimentary microfacies control in both the gypsum-salt layer and the gas-water layer.[Methods]The proposed technique encompasses five key technical aspects:(1)logging interpretation and 3D modeling of the gypsum-salt layer controlled by sedimentary microfacies,(2)seismic genetic inversion-based 3D modeling of the gypsum-salt layer guided by sedimentary microfacies,(3)well-seismically integrated 3D modeling of the gypsum-salt layer,(4)3D modeling of gas-water distribution influenced by sedimentary microfacies,and(5)fusion-based 3D modeling of both the gypsum-salt and gas-water layers.[Results]This method was applied to assess the influence of the gypsumsalt layer within the Feixianguan Formation in the Tieshanpo gas field of the Sichuan Basin on gas accumulation characteristics.Accurate 3D geological models were constructed that integrate well-seismic data with sedimentary microfacies control for both the gypsum-salt and gas-water layers.The results indicated that,except for some localized areas,a continuous distribution was observed across most regions of the Feixianguan Formation in the Tieshanpo area.Additionally,the formation exhibited multilayered characteristics with significant longitudinal thickness heterogeneity.Three distinct models were developed to illustrate the effects of gas capping,reduced gas storage capacity,and complex reservoir conditions resulting from the heterogeneous influence of the gypsum-salt layer.[Conclusion]These findings provide essential geological insights that can inform the development of effective strategies targeting natural gas reserves at non-equilibrium scales.

关 键 词：膏盐层控气非均质性 井震结合 相控建模 铁山坡飞仙关组 三维表征 四川盆地 

分 类 号：P618.13[天文地球—矿床学]