摘要
准确预测煤层气甜点区能为煤层气井井位优化部署提供重要保障。以沁水盆地柿庄北区块3#煤层为研究对象,基于煤层气勘探开发资料,计算了断层分维和构造曲率,结合分区叠加法和递阶优选法,进行构造复杂程度分区。应用含气量、渗透率测井解释模型,确定出3#煤储层资源丰度分布特征和产出动力特征;绘制了资源参数和产出动力参数的交会图,确定出不同构造分区的资源潜力差异和开发次序,建立了“构造分区-开发定序-甜点区预测”的煤层气开发甜点区预测方法,煤层气井的产气数据验证了预测结果的准确性。结果表明:根据断层分维和构造曲率的差异,研究区划分为构造简单区(I-a、II-a)、构造较复杂区(I-b、II-b)和构造复杂区(I-c、II-c)等6类。不同构造区的开发先后顺序依次为:构造较复杂区I-b、构造简单区I-a型/II-a型、构造较复杂区II-b型、构造较复杂区I-c型/II-c型。构造较复杂区I-b是煤层气开发甜点区。研究成果为构造复杂区煤层气勘探开发初期甜点区准确预测提供了一种方法和借鉴。
Accurately predicting the sweet spot area of coalbed methane can provide important guarantees for optimizing the deployment of coalbed methane well locations.Taking the 3#coal seam in the Shizhuang North Block of the Qinshui Basin as the research object,based on the exploration and development data of coalbed methane,the fault dimension and structural curvature were calculated.Combined with the zoning superposition method and hierarchical optimization method,the structural complexity was partitioned.Using gas content and permeability logging interpretation models,determine the distribution characteristics of resource abundance and production dynamics in the 3#coal reservoir;A intersection diagram of resource parameters and output power parameters was drawn to determine the differences in resource potential and development sequence of different structural zones.A prediction method for sweet spot areas in coalbed methane development was established,which includes“structural zone development sequence sweet spot area prediction”.The gas production data of coalbed methane wells verified the accuracy of the prediction results.The results indicate that based on the differences in fault dimension and structural curvature,the study area is divided into six categories:structurally simple areas(I-a,II-a),structurally complex areas(I-b,II-b),and structurally complex areas(I-c,II-c).The development sequence of different tectonic zones is as follows:complex tectonic zone I-b,simple tectonic zone I-a/II-a,complex tectonic zone II-b,and complex tectonic zone I-c/II-c.The complex zone I-b is a sweet spot area for coalbed methane development.The research results provide a method and reference for accurately predicting sweet spots in the early stage of coalbed methane exploration and development in complex areas.
作者
郭莹莹
倪小明
张海锋
张兵
GUO Yingying;NI Xiaoming;ZHANG Haifeng;ZHANG Bing(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;China United Coalbed Methane Corporation Ltd,Beijing 100011,China)
出处
《现代地质》
北大核心
2025年第6期1611-1621,共11页
Geoscience
基金
河南省杰出青年基金项目(242300421040)
国家自然科学基金项目(42372198)。
关键词
沁水盆地
煤层气
甜点区预测
构造分区
开发定序
Qinshui Basin
coalbed methane
prediction of sweet spots
tectonic partition
development sequencing
