深层气泥岩盖层封闭能力的综合评价——以东濮凹陷杜桥白地区沙河街组三段泥岩盖层为例  

COMPREHENSIVE EVALUATION OF SEALING CAPACITY OF CLAYSTONE IN DEEP GAS RESERVOIR──AN EXAMPLE OF Es_3 CLAYSTONE CAPROCK IN DUQIAOBAI AREA IN DONGPU DEPRESSION

作　　者：谈玉明[1,2] 任来义[3,2] 张洪安[4] 张金报[4] 胥菊珍[4,5] 金振华[4] 

机构地区：[1]中国科学院广州地球化学研究所 [2]中国石化中原油田分公司勘探开发科学研究院,河南濮阳457001 [3]石油大学地球资源与信息学院 [4]中国石化中原油田分公司勘探开发科学研究院 [5]中国地质大学,北京100083

出　　处：《石油与天然气地质》2003年第2期191-195,共5页Oil & Gas Geology

摘　　要：通过对东濮凹陷杜桥白地区沙河街组三段深层气盖层泥岩样品实验测试分析和研究 ,结果表明孔隙度的变化主要受深度和层位的控制 ;渗透率与深度关系密切 ,受层位的影响不大 ,与孔隙度等参数之间也没有明显的相关关系 ;突破压力随深度加大而增大 ,但这一趋势并不是十分突出 ;突破压力与层位的对应关系较明显 ,Es4 3 亚段的突破压力最大 ,Es23 亚段次之 ,而Es3 3 则相对较低。为了准确评价盖层封闭能力 ,选择了孔隙度、渗透率、排替压力、孔径 4个盖层评价的指标参数 ,并根据其重要性的大小分别给予 0 1,0 3,0 5和 0 1的权系数 ,以确定东濮凹陷深层气盖层的评价标准 :当综合评价的权值大于 0 8时 ,为封闭能力好的 1类盖层 ;当权值为 0 6～ 0 8时 ,为封闭能力中等的 2类盖层 ;而权值为 0 5～ <0 6时 ,为 3类盖层 ;权值为 0 3～ <0 5时 ,则为 4类盖层 ;而权值 <0 3时则为非盖层。The result from the experimental analyses of the 3rd member of Shahejie Fm (Es 3 ) claystone's sealing capacity in the deep gas pools in Duqiaobai area in Dongpu depression shows that the variation in porosity has been controlled by depth and horizons, whereas the permeability has close relation with depth, but it is almost not affected by the horizons, and doesn't have obvious relation with porosity and other related parameters, too. The breakthrough pressure is getting greater with the increase of depth, but this trend is not very prominent. There is a close relation between the breakthrough pressure and the horizons, among which, the Es 4 3 has the biggest breakthrough pressure, then the Es 2 3 comes next, and the Es 3 3 has relatively low breakthrough pressure.For the sake of evaluating the sealing capacity of cap rock accurately, porosity, permeability, displacement pressure, and pore diameter have been selected as the indexes of cap rock evaluation, and weight coefficients of 0.1,0.3,0.5,and 0.1 have respectively been given to them based on their importance ,so as to determine the evaluation standards caprocks of deep gas pools in Dongpu depression: when the weight coefficient is larger than 0.8,the cap rock belongs to I type, with good sealing capacity; if it is in the range of 0.6～0.8, the cap rock belongs to type II, having moderate sealing capacity; when it is in the range of 0.5～0.55,the cap rock belongs to type III; and if it is in the range of 0.3～0.45,the cap rock belongs to type IV; when it is less than 0.3, it is then of non-caprock.

关 键 词：泥岩封盖层 物性 封闭能力 突破压力 评价标准 东濮凹陷 

分 类 号：TE112.32[石油与天然气工程—油气勘探]