豫西地区海陆过渡相含气页岩层系优选方法及有利区预测  

The transitional facies shale gas formation selection and favorable area prediction in the western Henan

作　　者：李中明[1,2] 张栋[1,2] 张古彬[1,2] 司马献章[3] 刘艳杰[1,2] 王宏[1,2] 汪超[1,2] 瓮纪昌[1,2] 张超[3] 司庆红[3] 

机构地区：[1]河南省地质调查院,河南郑州450000 [2]地下清洁能源勘查开发产业技术创新战略联盟,河南郑州450000 [3]中国地质调查局天津地质调查中心,天津300171

出　　处：《地学前缘》2016年第2期39-47,共9页Earth Science Frontiers

基　　金：河南省重大科技专项项目"河南页岩气勘查开发及示范应用研究";中国地质调查局天津地质调查中心工作项目"华北地区页岩气(油气)基础地质调查与潜力评价"(12120114020301)子课题"河南洛阳-济源和开封-鹿邑等盆地群页岩气(油气)基础地质调查与潜力评价";河南省地质矿产勘查开发局重大项目"河南中牟页岩气勘查"

摘　　要：页岩气产自富有机质的泥页岩地层,豫西地区海陆过渡相地层中泥页岩累计厚度大且含气量较高,具有较好的页岩气成藏潜力,但由于其泥页岩单层厚度小、层数多、横向相变大,空白区缺少含气量数据的情况下,页岩气含气层选择难度大。文中以豫西上古生界为研究对象,将泥页岩的各项参数与含气量进行相关性分析和聚类分析,确定含气量的主控因素为有机质丰度、黄铁矿含量、渗透率、补偿密度和光电吸收截面指数,再应用回归分析得到含气量的拟合方程,经过验证确定其拟合效果较好,应用该方法对豫西上古生界海陆过渡相地层进行了含气性分析,得到大量含气量数据。文中提出了综合因子分析法,以含气量为一类因素,辅以有机质成熟度、孔隙度、脆性系数、厚度、埋深和面积等二类因素,经过计算得出储层有利系数以优选含气层,得出区域有利系数以预测有利区。利用豫西地区上古生界的实测和拟合含气量等数据,运用综合因子分析法,通过计算有利系数预测了朱仙镇、巩义和渑池页岩气有利区。Shale gas is produced in mud shale formation with abundant organic matter.The transitional facies formation mud shale has large cumulative thickness and high hydrocarbon content. The gas accumulation potential is good in the western Henan,but the mud shale is characterized by thin single formation,multi-layer and big transverse phase change.Because of the lack of large amount of gas-bearing tests of the blank area,it is difficult to choose good shale gas formation.This paper takes the Upper Palaeozoic in western Henan province as a research object,makes a correlation and clustering analysis of the various parameters and air content of the mud shale,confirms that the main controlling factors of the air content of the shale are organic matter abundance,rock density,permeability,pyrite content and photoelectric absorption cross section index.A regression analysis is carried out with the air content to get a fitting equation,which has been validated to be good for the determination of fitting.Finally,the gasbearing of the transitional facies shale in the western Henan province has been determined by this method and a great number of gas data have been obtained.Comprehensive factor analysis method is proposed in this paper,making the gas-bearing as a main factor,supplemented by secondary factors such as the organic matter maturity,porosity,coefficient of brittleness,thickness,burial depth and area.The reservoir benefit coefficient is calculated to choose a gas-bearing horizon,and get the regional advantageous factor to predict favorable area.Use the measured and fitted data of the Upper Palaeozoic in the mid-western and western Henan province,favorable factor is calculated to predict the shale gas advantageous area of Zhuxianzhen,Gongyi and Mianchi by using the comprehensive factor analysis method.

关 键 词：页岩气 上古生界 有利区 海陆过渡相 豫西 

分 类 号：P618.130.21[天文地球—矿床学]